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中国物理学会高能物理分会第十三届全国粒子物理学术会议(2021)

Asia/Shanghai
Description

各位参会同仁:

大会已安排就绪,具体内容详见左栏“Conference Handbook”中第十三届全国粒子物理学术会议(2021)会议手册。

会议统一采用ZOOM 会议系统,具体安排如下:

(一)大会报告                                            

Zoom ID: 636 605 7819
Zoom Passcode: 607267

ZOOM link: https://zoom.com.cn/j/6366057819?pwd=allaNThWKzhhYlhIVTBydXpobU5FQT09

 

(二)分会报告                                            

1)分会ITeV物理和超出标准模型新物理

Zoom ID: 331 205 7792
Zoom Passcode: 010478

ZOOM link: https://zoom.com.cn/j/3312057792?pwd=RSsrREc2UFpaeFdvc1FNeWtzQkNEdz09

2)分会II:强子物理与味物理

Zoom ID: 387 203 4840
Zoom Passcode: 892938

ZOOM link: https://zoom.com.cn/j/3872034840?pwd=eExaRXpkaW94amM2cTdaZUtKNWcrUT09

3)分会III 重离子物理

Zoom ID: 219 368 4961
Zoom Passcode: 875776

ZOOM link: https://zoom.com.cn/j/2193684961?pwd=NFFyZitiK2crZUZnbXF6WURseUJUdz09

4)分会IV:中微子物理、粒子天体物理与宇宙学

Zoom ID: 378 912 7236
Zoom Passcode: 004205

ZOOM link: https://zoom.com.cn/j/3789127236?pwd=WGUwS0FqdUVnQnA5OXZoL0J4R1dtQT09

5)分会V 粒子物理实验技术(同大会报告账号)

Zoom ID: 636 605 7819
Zoom Passcode: 607267

ZOOM link: https://zoom.com.cn/j/6366057819?pwd=allaNThWKzhhYlhIVTBydXpobU5FQT09

 

(三)第十一届晨光杯论文评审                           

Zoom ID: 87555590859

Zoom Passcode: 191352

ZOOM link: https://ihep-ac-cn.zoom.com.cn/j/87555590859?pwd=Ym5wdTBpdmZvU1VmbEUxUmUwR2R6dz09  

 

                                                                                                          2021年8月12日

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各位参会同仁:

关于“中国物理学会高能物理分会第十三届全国粒子物理学术会议” 转为线上进行的通知已通过indico系统发出,敬请查收。因部分单位邮箱及网易邮箱接收不到该群发信息,现将通知转发如下:

由于国内部分地区突发疫情,为严格遵守疫情防控要求,确保参会人员的健康与安全,高能物理分会与会议组织委员会讨论决定:原定在青岛举行的“中国物理学会高能物理分会第十三届全国粒子物理学术会议” 全部转为线上进行第十一届“晨光杯”优秀论文评选活动同期举行详细日程及会议远程连接方式将尽快修改完善后在会议网站公布。“高能物理战略研讨会”以及“庆祝李政道先生95华诞学术报告会”延期举行具体事宜将后续通知。

宾馆及会场方面,通过indico系统预订的海泉湾皇冠假日度假酒店以及青航美爵度假酒店房间,会务组将统一取消。自己预订的其他酒店,请大家自行取消。

值此疫情防控关键时刻,生命安全必须放在首位。对此给各位造成的不便和损失组委会深表歉意,敬请大家谅解,再次感谢各位专家、同事的参与和支持!

附:会议群二维码(请择其一入群)

                                                                                                             2021年8月2日

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各位参会同仁:

会议第二轮通知已通过indico系统发出,请查收。

请参会人员认真核对入住及离店时间,如有改动,请务必至少提前一周与会务组联系particle@sdu.edu.cn更改。未经提前通知不按注册时间入住,提前到达人员不保证有住房;注册入住日期当日未到达入住的,住房预定会被酒店自动取消。由此产生的额外费用将先由会务组垫付,参会人员承担

根据目前疫情形势,请参会人员密切关注疫情防控变化及要求。鉴于国内疫情形势随时变化,相关疫情防控及应对措施等通知,请随时关注会议网站和会议交流群

                                                                                                            2021年7月13日

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各位参会同仁:

目前会务组提前预订的两处酒店客房已接近饱和。鉴于后期注册人员需要解决住房问题,会务组调研了会场周边部分酒店,信息详见Accommodation栏请大家结合网络信息及酒店至主会场的交通状况,自主联系酒店订房。联系或入住酒店时,请说明“山东大学高能物理大会”参会人员可享受优惠价。

由于注册规模远超预期,造成后期注册人员无法选到满意的住房。近期,经组委会努力协调,房源得到进一步扩充。如您对原选房型不满意或没有选到住房,请于6月21日上午9点之后登录会议系统选择或调整自己的住宿选项,调整期一天。调整结束后,应部分前期未及时注册同事的强烈要求,组委会决定将短暂重新开放注册系统,将剩余房源提供给新注册的参会者,具体开放时间是6月23-24日。之后,会务组将尽快发布会议第二轮通知,请大家随时关注。

                                                                                                           2021年6月18日          

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由于疫情影响,原定于2020年召开的中国物理学会高能物理分会第十三届全国粒子物理学术会议,推迟至2021816-20日在青岛召开,815日注册报到。高能物理战略研讨会将于2021年8月14-15日召开,拟参加战略研讨会的老师同仁敬请8月13日报到。本次会议由中国物理学会高能物理分会主办、山东大学承办。大会组委会诚挚邀请各位同仁参加本届会议,并积极提交学术报告摘要。第十一届“晨光杯”优秀论文评选活动同期举行,本次会议将评选出2018-2020年度优秀论文,并向获奖者颁发证书。鉴于疫情影响,本次会议将采取线上和线下同时进行的方式。鉴于八月份为青岛旅游旺季,请大家务必于531日前完成网上注册。

 

会议主要内容:

一、交流国内外高能物理和粒子物理领域最新研究成果和进展。

本次大会将按照下面五个研究领域来组织报告,并在每个领域中包含实验和理论研究进展:

1. TeV物理和超出标准模型新物理

2. 强子物理与味物理

3. 重离子物理

4. 中微子物理、粒子天体物理与宇宙学

5. 粒子物理实验技术

请分会报告人按照上述分会议题提交会议报告,大会邀请报告人名单、分会召集人名单详见左栏相关信息。

二、第十一届“晨光杯”青年优秀论文评选活动及颁奖。       

高能物理分会每两年举办一次青年优秀论文评选活动。第十一届“晨光杯”青年优秀论文评选活动与第十三届全国粒子物理学术会议同时举办。本届“晨光杯”论文提交截止于2020年3月31日,并于2020年5月完成初选。由于疫情影响,本届“晨光杯”优秀论文终评延期到2021年进行。2020年4月以后发表的论文如有意申报“晨光杯”青年优秀论文,将纳入第十二届“晨光杯”申报。

参加评选活动的条件:1. 申请人是从事高能物理(包括粒子物理理论和实验、中高能核物理、宇宙线和高能天体物理等)科研工作的35岁以下尚未获得高级科教职称的青年科研人员(即不接受已经获得教授、副教授以及同等职称的研究人员参评)。2. 申报论文必须是申请截止日期以前,已正式发表的论文或已接受发表的论文。3. 申请人应为申报论文的主要贡献者,且申请人及申报论文的第一单位为国内单位。欢迎青年科技人员积极参加评选活动,并邀请各位高能物理分会的常委和委员积极组织、推荐优秀论文参选。

“晨光杯”将设一等奖1-3名,二等奖3-6名。高能物理分会将对获奖者颁发获奖证书和奖金。

三、2021高能物理战略研讨会

本次大会前,即2021年8月14-15日将举办高能物理战略研讨会,拟参加战略研讨会的与会人员请于8月13日(周五)报到。战略研讨会的相关详细信息将后续通知。

 

会议有关事项:

一、 会议时间:

2021816日-820日,815日在青岛海泉湾皇冠假日酒店报到。

二、 会议注册

会议注册网址:https://indico.ihep.ac.cn/event/10906/overview。请使用中文进行注册,并确保姓名、单位信息、税号等信息的准确,以便于开发票。全国粒子物理学术会议注册费:教师(含博士后)1500元/人,学生1200元/人,参会家属800元/人。高能物理战略研讨会注册费:教师800元/人,家属400元/人。会议协助安排食宿,费用自理。

三、 地方会务组联系人:

尹  娜(会务秘书)     电话: 0532-58631321 (办公室), Email: yina@sdu.edu.cn

黄性涛(会务协调人) 电话: 0532-58631310 (办公室), Email: huangxt@sdu.edu.cn

王  萌(会务协调人)  电话: 0532-58631369 (办公室), Email: mwang@sdu.edu.cn

徐庆华(会务协调人) 电话: 0532-58631386 (办公室), Email: xuqh@sdu.edu.cn

四、 分会秘书处联系人:

邱  雯(分会秘书)    电话:010-88235843(办公室), Email:qiuw@ihep.ac.cn

赵  强(分会秘书长) 电话:010-88236578(办公室), Email:zhaoq@ihep.ac.cn

中国物理学会高能物理分会 第十三届全国粒子物理学术会议2021第一轮通知
中国物理学会高能物理分会第十三届全国粒子物理学术会议2021第二轮通知
第十一届“晨光杯”青年优秀论文申请-推荐表
第十三届全国粒子物理学术会议(2021)会议手册
第十三届全国粒子物理学术会议(2021)会议手册-v0806
第十三届全国粒子物理学术会议(2021)会议手册-v0812
Participants
  • Ahsan Mehmood Khan
  • Andrew Fowlie
  • Bin Wang
  • Chen Wang
  • chengqun Pang
  • Chi Ding
  • Chuan 岳
  • Chuangxin Lin
  • Defu Hou
  • dongdong Hu
  • Donglian Xu
  • Fangcheng HE
  • Fangju Wang
  • Fanrong Xu
  • Feixiang Lu
  • Feng LYU
  • Gaoqing Cao
  • GONGMING(功明) YU(余)
  • Guang Zhao
  • Guofa XU
  • Guoming CHEN
  • Hai Lin
  • Haidar Mas'ud Alfanda
  • Haijun Yang
  • Haipeng An
  • haiping peng
  • Hanqing Liu
  • Hao Cai
  • He Li
  • Heng-Tong Ding
  • Hengying Zhang
  • Hideki (英希) Okawa (大川)
  • Hongjie MU
  • Hongxi Xing
  • Huanhuan PI
  • Huaqiao ZHANG
  • Hui Dong
  • Jialun Ping
  • Jianbei Liu
  • Jianbin Jiao
  • Jianhui Zhang
  • Jiawen ZHANG
  • Jiaxing Zhao
  • Jibo(吉波) HE(何)
  • Jike Wang
  • Jilei Xu
  • Jing Shu
  • Jing Wang
  • Jun Gao
  • Jun Guo
  • Jun He
  • Jun Yan
  • Kai Liu
  • kang jia
  • Kangkang Zhao
  • Lei Li
  • Lei Xia
  • Liang Han
  • Liang Sun
  • Lili Yang
  • lingling Malingling_马玲玲_羊八井
  • Long Ma
  • Manqi Ruan
  • mao song
  • Maomao GE
  • Mei Huang
  • mingming xia
  • Mustafa Anaam
  • Nihar Sahoo
  • ning liu
  • peng sun
  • Penghui Hu
  • Qian Yang
  • Qin Chang
  • Qing Lin
  • Qiumei MA
  • Quanbu Gou
  • Qundong Han
  • Ran HAN
  • Rong Wang
  • Sen Qian
  • Shanjin Wu
  • Sheng-Qin Feng
  • Sheng-Tai Li
  • Shi Pu
  • SHI-YUAN LI
  • Shizheng YANG
  • Shoushan Zhang
  • Shu Li
  • Shuopin Wen
  • Sixue Qin
  • Taozhe 余涛哲
  • Tian-lu CHEN
  • Tian-Wei Wu
  • Tingting Han
  • Tong Liu
  • Wai Kin Lai
  • Wang Yi
  • Wei Chen
  • Wei Dai
  • Wei Wang
  • Wei Wang
  • Weiguo Lu
  • Weihu Ma
  • Weihua Yang
  • Weiran Xu
  • Wenchang Xiang
  • Wenda Guo
  • Wenli 郑文莉
  • xia wan
  • Xiang Zhou
  • Xiangrong Zhu
  • Xiaohui Liu
  • Xiaojun Bi
  • Xiaolong Chen
  • Xiaomei Li
  • Xiaoming Zhang
  • Xiaonan LI
  • Xin Chen
  • Xuai ZHUANG
  • Ya'ou Jiang
  • Ya-Ping Xie
  • Yandong Liu
  • Yang Tian
  • Yao Zhang
  • Yaquan FANG Yaquan
  • Ye YUAN
  • Yi-Lei Tang
  • Yixiong Zhou
  • Yu-Feng Zhou
  • Yu-Ming Wang
  • Yubing dongyb@ihep.ac.cn
  • yunyun fan
  • Zehua Xu
  • ZEQIANG WANG
  • Zeyu Zhai
  • Zhao Zhang
  • Zhaoxia Meng
  • ZHE NING
  • Zhenyu ZHANG
  • zhong yang
  • Zhongbao Yin
  • Ziyuan LI
  • Zou Liping
  • Zuo-Hong Li
  • 一凡 沈
  • 一可 许
  • 一多 商
  • 一民 赵
  • 一玻 杨
  • 一飞 张
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  • 万伦 徐
  • 万兵 何
  • 世浩 陈
  • 世琳 朱
  • 世聪 胡
  • 世超 叶
  • 丙昊 孙
  • 业情 祁
  • 东浩 李
  • 东海 柳
  • 严 李
  • 中洲 任
  • 丹 池
  • 丹昊 张
  • 为 王
  • 丽 袁
  • 丽华 宋
  • 丽双 马
  • 丽桃 杨
  • 丽清 秦
  • 书魁 刘
  • 于晓霞 于晓霞
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  • 云宇 王
  • 云鹏 卢
  • 云鹤 吕
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  • 剑桥 邓
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  • 剑锋 上官
  • 力 严
  • 力 赵
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  • 勇 谢
  • 勇康 黃
  • 勇杰 孙
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  • 勋 陈
  • 勤涛 宋
  • 北江 刘
  • 华 周
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  • 双勇 周
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  • 合言 聂
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  • 李院霞 LI Yuanxia
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  • 柯红卫 Ke
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  • 良文 陈
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  • 艳婷 范
  • 艳席 张
  • 艳红 于
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  • 艺 蒋
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  • 艾合麦提江 阿卜杜如苏力
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  • 芦晓盈 芦
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  • 金岩 刘
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  • 金环(Jin-Huan ) 盛(Sheng)
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  • 金龙 张
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  • 鑫 曾
  • 鑫 王
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  • 锦 王
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  • 镇轩 张
  • 长征 苑
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  • 阳光 杨
  • 阳恒 郑
  • 阿布都沙拉木 阿布都克力木
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  • 雄飞 王
  • 雅倩 朱
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  • 雪杰 刘
  • 雪森 林
  • 雪辰 赵
  • 雪龙 秦
  • 雯 邱
  • 雷 武
  • 霄 杨
  • 霄楠 侯
  • 震 胡
  • 震宇 张
  • 震宇 陈
  • 青 余
  • 青 王
  • 青林 耿
  • 靖靖 杨
  • 静 董
  • 静 赵
  • 静舒 李
  • 韬 林
  • 颖 张
  • 颖洁 周
  • 飞 高
  • 飞 黄
  • 香盼 段
  • 马润秋 马
  • 驰 杨
  • 骁 王
  • 骅 裴
  • 骞 岳
  • 高国 闫
  • 鸿 毛
  • 鸿浩 马
  • 鸿飞 张
  • 鹏 刘
  • 鹏 张
  • 鹏宇 任
  • 鹏宇 牛
  • 鹏忠 卢
  • 鹏程 路
  • 鹏雄 马
  • 鹏飞 杨
  • 鹏飞 殷
  • 鹿蒙 刘
  • 麟云 贺
  • 黎明 张
  • 默瑶 孙
  • 鼎煜 邵
  • 齐放 吕
  • 齐烨 寿
  • 龙 唐
  • 龙 李
  • 龙健 王
  • 龙斌 陈
  • 龙洲 廖
    • 08:30 10:30
      Plenary SessionⅠ
      Convener: Prof. Yuanning Gao (清华大学)
      • 08:30
        樊丽明:山东大学校长致辞 15m
      • 08:45
        王贻芳:高能物理分会工作报告 35m
        Slides
      • 09:20
        陈明君:LHAASO最新结果 35m
        Speaker: Dr 明君 陈 (IHEP,CAS)
        Slides
      • 09:55
        周 宁:暗物质探测 35m
        Speaker: Prof. Ning Zhou (Shanghai Jiao Tong University)
        Slides
    • 10:30 10:40
      Coffee Break 10m
    • 10:40 11:50
      Plenary Session II
      Convener: Prof. Zhengguo Zhao (USTC)
      • 10:40
        安海鹏:超出标准模型新物理 35m
        Speaker: Haipeng An (Tsinghua University)
      • 11:15
        阮曼奇:高能环形正负电子对撞机 35m
        Speaker: Mr Manqi Ruan (IHEP)
        Slides
    • 11:50 14:00
      Lunch 2h 10m
    • 14:00 16:05
      Parallel Session III:Heavy Ion Physics: Chirality & Vortocity (Chair: 罗晓峰)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 14:00
        Relativistic spin hydrodynamics 25m
        Speaker: Xu-Guang Huang (Fudan University)
      • 14:25
        Spin Hydrodynamics in Belinfante form and local spin polarization 25m
        Speaker: 实 浦
      • 14:50
        Dependence of QGP evolution on smearing velocity in HIC 15m
        Speaker: Dr Wei-Tian Deng (HuaZhong University of Science and Technology (HUST))
        Slides
      • 15:05
        Shear-induced spin polarization in heavy-ion collisions 15m
        Speaker: Baochi Fu (Peking University)
        Slides
      • 15:20
        Non-Abelian Covariant Chiral Kinetic Equation 15m
        Speaker: 晓丽 罗 (Shandong University)
        Slides
      • 15:35
        Mass splitting of vector meson and spontaneous spin polarization under rotation 15m
        Speaker: 魏明华
        Slides
      • 15:50
        Counting Topological Windings of Gauge Fields with Chiral Magnetic Effect 15m
        Speaker: 安平 黄 (清华大学)
    • 14:00 16:00
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 14:00
        Observation of new excited heavy flavour hadrons at LHCb 20m
        Study of spectroscopy of heavy flavour hadrons can help to understand non-perturbative QCD. Observation of new excited heavy flavour hadrons will provide important constraints on theoretical models of heavy flavour spectroscopy. This talk presents recent results of new excited heavy flavour hadrons at LHCb.
        Speaker: Hongjie MU (Tsinghua University)
        Slides
      • 14:20
        Vector charmonium(-like) states at BESIII 15m
        With the accumulation of data samples above 4 GeV in recent years, BESIII collaboration has systematically investigated possible conventional charmonia and Y states, as well as their decay channels. Through a series of process cross section measurements, including open charm and hidden charm channels, BESIII provided a lot of information on the vector states. In this talk, we would like to show some results on the vector states studied at BESIII in recent years.
        Speaker: Houbing Jiang (Shandong University)
        Slides
      • 14:35
        Recent studies of non-vector charmonium(-like) states at BESIII 20m
        In this talk, some recent results on the non-vector charmonium(-like) states at BESIII will be presented. It will include an observation of a near-threshold enhancement in the Lambda Lambda-bar mass spectrum from e+ e- -> phi Lambda Lambda-bar at sqrt(s) from 3.5 to 4.6 GeV, search for new decay modes of the D-wave state psi(3823) and the process e+ e- -> pi0 pi0 psi(3823), and study of e+ e- -> pi0 X(3872) gamma and search for neutral Zc(4020) radiactive transition to X(3872).
        Speaker: Yunxuan Song (Peking University , University of Chinese Academy of Sciences)
        Slides
      • 14:55
        Recent results from Belle 20m
        Recent results from Belle will be reviewed
        Speaker: Prof. Jianbin Jiao (Shandong University)
        Slides
      • 15:15
        Light meson spectroscopy BESIII 15m
        Due to the high production of light mesons J/ψ radiative and hadronic decays, the largest sample of J/ψ events accumulated at the BESIII detector offers a unique laboratory to study the light mesons spectroscopy and search for the light exotic states. In this talk, we shall report the recent progresses on the light meson spectroscopy achieved at BESIII.
        Speaker: Mr Ning Cao (Institute of High Energy Physics, Chinese Academy of Sciences)
        Slides
      • 15:30
        Light meson decays at BESIII 15m
        The world’s largest sample of J/ψ 1.3 billion events accumulated at the BESIII dector offers a unique opportunity to study light meson decays. In recent years the BESIII experiment has made significant progresses in eta/eta' decays, including observation of eta'->pi+pi- mu+mu-, search for the rare decays of eta’à4pi0 and eta’àgam gam eta as well as the search for CP violation in eta’àpi+pi- e+e-. In addition, the prospects for the light meson decays with the available 10 billion J/ψ will also be discussed.
        Speaker: Dr Xiaolin Kang
        Slides
      • 15:45
        A general and user-friendly partial wave analysis framework: TF-PWA 15m
        In this talk, a new general and user-friendly partial wave analysis framework called TF-PWA will be introduced. TF-PWA is developed based on the open-source library TensorFlow. It uses modern techniques like GPU, vectorized calculation and automatic differentiation to accelerate amplitude analyses. It is also a general PWA framework and can be used in most of the amplitude analyses easily. This software has currently been used in many LHCb and BESIII amplitude analyses and it can also been used by theorists and experimentalists who are interested in phenomenology of exotic states, CP violation in multibody decays and new physics hunting in FCNC processes.
        Speaker: 蒋 艺 (University of Chinese Academy of Sciences)
        Slides
    • 14:00 16:05
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 14:00
        The high light reuslt from LHAASO-KM2A 15m
        The results of LHAASO-KM2A will be presented
        Speaker: Dr SongZhan Chen (IHEP,CAS, Beijing)
        Slides
      • 14:15
        Data analysis and key science results of LHAASO-WCDA 15m
        Large High Altitude Air Shower Array (LHAASO) is a large hybrid EAS experiment located in Haizi Moutain, Daocheng, Sichuan province. Water Cherenkov Detector Array (WCDA) is one of sub-arrays aiming at VHE gamma ray astronomy. LHAASO-WCDA has finished 2 pools installation and data-taking in the year of 2020. Based on these data a lot of works and implementation have been proceed, such as the gamma emissions from the full northern sky. The preliminary analysis results, including observed significant source candidates, the spectrum measurement and other related works are presented in this talk.
        Speaker: 世聪 胡 (高能所)
        Slides
      • 14:30
        Measurement of cosmic ray mean mass around the knee region by muon content in air showers with LHAASO-KM2A 15m
        The number of muons observed at the ground from air showers is sensitive to the mass composition of cosmic rays. The KM2A sub-array of the Large High Altitude Air Shower Observatory (LHAASO) can measure the size and muon content of an air shower simultaneously with high precision for cosmic rays with energies in the knee region. In this paper, the performance of the KM2A is validated in that the experimental data agree well with simulation data. The mean number of muons in air showers is measured by analyzing the signal of muon detectors in the first KM2A quarter-array for cosmic rays with energies from hundreds of TeV to tens of PeV. The energy is reconstructed with one new combined variable $N_{\mu e}$, which is weakly dependent on the components of cosmic rays. There is no obvious excess in muon abundance at least up to 30 PeV form comparison with the simulation results of protons and irons. The mean logarithmic mass of cosmic rays as derived from the mean number of muons is presented along with systematic errors from the energy scale and hadronic models and compared with that from other experiments. We find the mean mass of cosmic rays is almost constant before the knee region and afterwards becomes heavy.
        Speaker: Hengying Zhang (Shandong University)
        Slides
      • 14:45
        The study of the longitude development of muons in air shower 15m
        The longitude development of the muonic component in the extensive air shower can help to determine mass composition of cosmic rays. By using the timing information of muons, the production positions of muons can be reconstructed. $X_{max}^{\mu}$ which is the position with muon production reaching maximum is sensitive to the mass composition of cosmic rays. In this paper, the reconstruction of muon’s geometrical production heights along the shower axis by using their timing information are studied for cosmic rays with energies from 1PeV to 10 PeV by CORSIKA data. According to our analysis, the resolution of $X_{max}^{\mu}$ is 500$g/cm^{2}$ with a resolution about 32 $g/cm^{2}$ for showers initiated by protons with energy 10 PeV ,and zenith angle $\theta$=$45^\circ$.
        Speaker: Liping Wang (SDU)
        Slides
      • 15:00
        Observation of Horizontal Air Showers with LHAASO-KM2A 15m
        LHAASO-KM2A is a sub-array of the Large High Altitude Air Shower Observatory (LHAASO) with an area of 1.3 km^2. It consists of 5195 electromagnetic detectors (EDs, 1 m^2 each) and 1171 muon detectors (MDs, 36 m^2 each). Horizontal Air Showers (HAS) are a fundamental tool to detect penetrating particles like neutrinos and to study hadronic interactions. HAS detected at ground are mainly constituted by secondary muons. In this contribution first observations of HAS with LHAASO-KM2A are reported. We discuss the zenith angle distribution of EAS and the transition from electromagnetic-dominated showers to muon-dominated ones above a zenith angle of 60 degree.
        Speaker: Dr Quanbu Gou (Institute of High Energy Physics, CAS)
        Slides
      • 15:15
        大型超高能伽马源立体跟踪观测设备(LACT)计划介绍 15m
        2021年5月17日,LHAASO在nature期刊发表了十二个百TeV以上的伽马射线源,开创了超高能伽马射线(PeVotran)观测的新窗口,解开超高能宇宙线起源这一世纪之谜出现了曙光。然而,LHAASO的角分辨约为0.3度,不足以对源的进行精细观测,需要更高角分辨(0.06度)的成像大气切伦科夫望远镜阵列,对这些源进行精细观测,从而确定超高能伽马射线源的本质并解开超高能宇宙线起源的世纪之谜。欧洲的科学家在2004年提出CTA计划,其计划涵盖高能和低能伽马源定点跟踪观测。LHAASO实验和CTA计划自然而然形成了国际分工,由LHAASO全天区扫描,发现伽马源,然后由CTA对源进行跟踪精细观测,例如对源的morphology进行研究。LHAASO将于今年8月份全阵列投入运行,而欧洲CTA计划却滞后严重,特别是超高能望远镜的建设严重滞后。从CTA官网公布的建设计划看,预计在未来6年内,中型和小型望远镜不会有大的进展。因此,我们提出了通过自主创新设计,研制由32台口径6米的成像大气切伦科夫望远镜组成的大型超高能伽马源立体跟踪观测设备(LACT)计划。LACT计划设计的中心思想既能够借上LHAASO世界最强的伽马/质子鉴别能力、现成的平方公里场地,还能发挥其独特的优异的高角分辨优势,对超高能伽马源进行高角分辨率成像观测研究。LACT的角分辨优于0.06度,与LHAASO缪子探测器联合观测,可实现背景高排除率。LACT覆盖一平方公里,建成将是目前世界上最大且最灵敏的超高能伽马源观测望远镜设备。LACT计划建成后,将和LHAASO实现优势互补,充分挖掘大科学装置的优质资源,从而能够获得重大的科学发现、揭开超高能伽马射线源的本质并解开超高能宇宙线起源的世纪之谜。LACT目前的进展是已初步完成一台样机在LHAASO站点的安装和调试,正在开展相关关键技术攻关和方案优化等研究工作。
        Speaker: Dr Shoushan Zhang (Institute of High Energy Physics)
      • 15:30
        Comparison of the particle acceleration between pileup shock and converging shock 15m
        On the one hand, observations show that there are proton spectral ''breaks'' with energy $E_{br}$ at 1-10MeV in some large solar energetic particle (SEP) events. Such as in the 2006 Dec 13 SEP event, which would be associated with the converging interaction between the coronal mass ejection (CME)-diven shock and the Earth's bow shock. On the other hand, the ground-level enhancement (GLE) events are often associated with the twin CME-driven shock. Observations show that there are ''ankle'' energy spectral slopes in the generated SEP events. Such as in the the GLE event on 2012 May 17. We suggest that GLE with an energy spectral ''ankle'' would be responded to the pileup interaction of the twin-shock; The SEP with an energy spectral ''break'' would be associated with the converging shock interaction. We have done the simulations using the Monte Carlo particle method and have investigated that the results were consistent with the observations separately.
        Speaker: Mr Xin Wang (1. Xinjiang Astronomical Observatories, CAS)
      • 15:45
        双区扩散模型下脉冲星对宇宙线正电子超出的解释 15m
        宇宙线正电子的高能超出部分最有可能的来源是脉冲星和暗物质。对于脉冲星的解释,近期的一些观测进展促使我们对该模型重新进行分析。首先,AMS-02最新的正电子能谱测量以较高的显著性表明了高能截断的存在。我们认为,这个结果意味着高能正电子很有可能主要由个别的脉冲星贡献。另外,HAWC、LHAASO等实验表明脉冲星附近可能普遍存在着尺度为数十pc的宇宙线慢扩散区,该区域中的扩散系数要显著小于一般星际介质中的数值。在这个双区扩散模型下,脉冲星在地球处产生的正电子流量相比先前的单区模型会有显著的改变。我们遍历了目前观测到的所有脉冲星,发现除了先前认为的重要候选者Geminga之外,PSR B1055-52是一个非常有可能的高能正电子来源。该脉冲星有可能是观测到的脉冲星中距离我们最近的,并且特点和Geminga十分类似。我们发现,该脉冲星甚至有可能对HESS实验探测到的20TeV左右的正负电子流量做出解释。
        Speaker: Dr 堃 方 (中国科学院高能物理研究所)
        Slides
    • 14:00 16:00
      Parallel Session I:TeV and BSM Physics: (Chair: Zongguo Si)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 14:00
        Searches for strong production of supersymmetric particles with the ATLAS detector 15m
        Searches for strong production of supersymmetric particles with the ATLAS detector
        Speaker: Mr Yang Liu (IHEP)
      • 14:15
        Searches for electroweak production of supersymmetric particles with the ATLAS detector 15m
        Searches for electroweak production of supersymmetric particles with the ATLAS detector
        Speaker: Dr Da Xu (IHEP, Beijing)
        Slides
      • 14:30
        Multi-scalar signature of self-interacting dark matter in the NMSSM and beyond 15m
        We implement the self-interacting dark matter scenario in the NMSSM and beyond. An improved analytical estimation for the dark matter (DM) self-interacting cross section is proposed. Due to the large couplings and light mediator in SIDM scenario, the DM/mediator will go through multiple branchings if they are produced with high energy. Based on the Monte Carlo simulation of the showers in DM sector, we obtain the multiplicities and the spectra of the DM/mediator from the Higgsino production and decay at the LHC for our benchmark points.
        Speaker: Jinmian Li (四川大学)
        Slides
      • 14:45
        Exotic Searches with the ATLAS Detector 15m
        Search for new physics beyond the Standard Model is one of the major components of the ATLAS physics programmes at the Large Hadron Collider at CERN. This talk presents a summary of non-SUSY searches for exotic decays using proton-proton collision data collected with a centre-of-mass energy of 13 TeV. A few selected searches using photons, jets, missing transverse momentum are focused. No significant excess has been observed above the Standard Model expectations, and new exclusion limits are placed on several Standard Model extensions.
        Speaker: Yufeng Wang (Shanghai Jiao Tong University)
        Slides
      • 15:00
        Search for a generic heavy Higgs at the LHC 15m
        A generic heavy Higgs has both dim-4 and effective dim-6 interactions with the Standard Model (SM) particles. The former has been the focus of LHC searches in all major Higgs production modes, just as the SM one, but with negative results so far. If the heavy Higgs is connected with Beyond Standard Model (BSM) physics at a few TeV scale, its dim-6 operators will play a very important role - they significantly enhance the Higgs momentum, and reduce the SM background in a special phase space corner to a level such that a heavy Higgs emerges, which is not possible with dim-4 operators only. We focus on the associated VH production, where the effect of dim-6 operators is the largest and the SM background is the lowest. Main search regions for this type of signal are identified, and substructure variables of boosted jets are employed to enhance the signal from backgrounds. The parameter space of these operators are scanned over, and expected exclusion regions with 300 fb$^{-1}$ and 3 ab$^{-1}$ LHC data are shown, if no BSM is present. The strategy given in this paper will shed light on a heavy Higgs which may be otherwise hiding in the present and future LHC data.
        Speaker: yue xu (Tsinghua University)
        Slides
      • 15:15
        Search for vector-like quark and leptoquarks at CMS 15m
        A search is presented for single production of a vector-like quark T of electric charge +2/3 in the decay channel featuring a top quark and a Z boson, with the top quark decaying hadronically and the Z boson decaying to neutrinos. The search uses data collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV recorded at the CERN LHC in 2016-2018, corresponding to an integrated luminosity of 136 fb−1. The search is sensitive to a T quark mass between 0.6 and 1.8 TeV with decay widths ranging from narrow up to 30% of the T quark mass. Reconstruction strategies for the top quark are optimized for boosted and non-boosted regimes. At the 95% confidence level, in the studied T quark mass range the product of the cross section and branching fraction is excluded above values in the range 15-602 fb for a T quark of narrow decay width, and above values in the range 16-836 fb for decay widths from 10% to 30% of the T quark mass.
        Speaker: Taozhe Yu (IHEP)
        Slides
      • 15:30
        Search for heavy resonances decaying into a photon and a hadronically decaying Higgs boson in pp collisions at √s=13 TeV with the ATLAS detector 15m
        Search for heavy resonances decaying into a photon and a hadronically decaying Higgs boson in pp collisions at √s=13 TeV with the ATLAS detector
        Speaker: Bo Liu (IHEP)
    • 14:00 16:05
      Parallel Session V:Particle Detector Technology
      Convener: Prof. 月昆 衡 (高能所)
      • 14:00
        The design and study of RICH detector for Super Tau-Charm Facility 20m
        The under exploring Super tau-Charm facility (STCF) project, which is an electron-position operating at the center-of-mass 2~7 GeV, is a natural extension of the Beijing Spectrometer (BESIII) and will play crucial role in the high density frontier of elementary particle physics field worldwide. The PID detector in STCF located between the tracking detector, main drift chamber and the EMC, which serves an excellent PID capability for charged hadrons ($\pi^{\pm}, K^\pm$, and $p^\pm$). The effective PID over the full kinetics space in the detector acceptance is required to reach a statistical separation power better than 3 sigma to fulfill the desired physics goals. In the conceptual design, RICH detector is one suitable candidate for PID at STCF barrel region. The RICH consist of 12 identical block modules. In each module, C6F14 is chosen as the radiator, followed with light propagation zone, photo-cathode, multiplier and anode. The proximity gap is foreseen to be no larger than ~10 cm. The threshold of the RICH is less than 1 GeV/c to connect to the PID power of tracking system and can reach to 2 GeV/c. Geant4 simulations are performed to study the expected performance. By applying the reconstruction algorithm, > 3 sigma separation capability can be reached. A beam test has also been performed on our prototype.
        Speaker: Dr 滨龙 王 (UCAS)
        Slides
      • 14:20
        A dedicated SiPMs array for GRD of GECAM 15m
        The discovery of gravitational waves and their gamma bursts has opened the era of multi messenger astronomy. China's Gravitational wave high energy Electromagnetic Counterpart All-sky Monitor (GECAM) uses two small satellites to monitor gamma-ray bursts in an all-sky field of view. It has a quasi-real-time gamma burst broadcast capability and will play an important role in the location of gravitational wave sources and subsequent observations. Each GECAM small satellite is equipped with 25 3-inch diameter gamma ray detectors (GRD), which can cover 8 keV-2 MeV. GRD uses SiPMs instead of PMT to adapt to the size constraints of micro-satellite platforms, and uses high light yield lanthanum bromide crystals to lower the threshold to 8 keV. A unique 3-inch circular SiPMs array has been designed, using 64 6x6 mm chip units, uniformly arranged in a circular shape, filled with reflective film in the gap, and good uniformity of light collection is obtained; the back of the SiPMs array integrates a front amplifier circuit, two-stage grouping summation is adopted to obtain a good signal-to-noise ratio; two channels readout with high and low gain is adopted to achieve a large dynamic range; two groups of independent power supplies are used, and each group can be turned off separately, which improves reliability. This presentation will introduce the status of GECAM and then focus on the SiPMs array, includes its design and performance.
        Speaker: Mr 希磊 孙 (IHEP)
        Slides
      • 14:35
        Determination of reponses of liquid xenon to low energy electron and nuclear recoils using a PandaX-II detector 15m
        I'll present a systematic determination of the responses of PandaX-II, a dual phase xenon time projection chamber detector, to low energy recoils. The electron recoil (ER) and nuclear recoil (NR) responses are calibrated, respectively, with injected tritiated methane or $^{220}$Rn source, and with $^{241}$Am-Be neutron source, in an energy range from 1-25 keV (ER) and 4-80 keV (NR), under the two drift fields, 400 and 317 V/cm. An empirical model is used to fit the light yield and charge yield for both types of recoils. The best fit models can describe the calibration data significantly. The systematic uncertainties of the fitted models are obtained via statistical comparison to the data.
        Speaker: Dr Binbin Yan (postdoctor)
        Slides
      • 14:50
        位置灵敏型快时间探测器研究进展 15m
        快时间探测器因其超快的时间分辨和位置分辨广泛应用于高能物理,核医学检测,生物检测等领域。如在LHCb升级计划中提出的TORCH探测器要求其其探测器时间分辨小于70ps;CEPC中提出的晶体量能器方案要求其时间分辨<100ps;随着医疗影响技术的发展TOF-PET也提出了10ps符合时间分辨(FWHM)的目标,此外也有很多高能物理领域和成像领域对快时间位敏型光电倍增管有很大的需求。在成功研制出20英寸光电倍增管后,结合国际国内应用需求,微通道板型光电倍增管合作组继续展开了位置灵敏型快时间光电倍增管的研制。在攻克各项技术难题后,已成功研制出快时间位敏型光电倍增管,本报告将针对快时间位敏型光电倍增管的研发需求、研发历程、快时间测试方法、研究现状等几个方面进行介绍。
        Speaker: Dr Ma lishuang (IHEP)
        Slides
      • 15:05
        微结构探测器和新型电磁量能器的研制与应用 15m
        Speaker: Ms Xiaomei LI Xiaomei (高能所)
      • 15:20
        Development of a highly granular electromagnetic calorimeter prototype for the CEPC 15m
        A highly granular electromagnetic calorimeter prototype has been designed with particle flow algorithms within the CALICE collaboration for precision measurements of Higgs and electroweak physics at future lepton collider experiments, including the Circular Electron Positron Collider (CEPC). Scintillator strips and silicon photomultipliers (SiPMs) are instrumented as sensitive layers and tungsten-copper alloy plates as absorber. Scintillator strips are individually wrapped with ESR foil and directly coupled with SiPMs. A 32-layer sampling calorimeter prototype (with over 6700 channels in total) has been constructed with scintillator strips interleaved with tungsten-copper absorber plates. Long-term cosmic-ray tests were performed, followed by a beam test in 2020 at the IHEP BEPC-II E3-beamline for quantitative studies on the key performance. This talk will cover key aspects in the prototype development, the latest status of commissioning, selected results of cosmic ray and beam tests.
        Speaker: Yazhou Niu (USTC)
      • 15:35
        PandaX-4T暗物质探测器用超高纯氪氙低温精馏系统运行结果分析 15m
        PandaX实验是我国首个大型液氙暗物质探测实验,针对如何降低暗物质探测器的探测介质液氙中放射性氪-85含量,从而获得高纯度氙的问题,研制出一种将氪从氙中提取出来以获得超高纯度氙气的高效低温精馏系统。该精馏系统中的主要结构精馏塔采用填料塔形式,塔高6m,直径125mm,其中对于精馏段4m,提馏段2m。氪气相精馏回流比为145,液相精馏回流比为45。根据设计,该精馏系统可以在回收率为99%的情况下,以10kg/h(30SLPM)的速率将氙中氪的含量从5X10(-7) mol/mol(0.5ppm)降至低于10(-14) mol/mol(0.01ppt),这对要求高精度、高灵敏度、低本底的大型暗物质探测器的研制至关重要。PandaX-4T超高纯氙去除氪低温精馏系统稳定运行1.5月,共提纯5.75t氙。提纯运行期间的实验数据表明,系统在各运行阶段状态稳定。经过测量,精馏得到的产品氙中氪含量小于8ppt(受限于氪测量系统精度)。
        Speaker: Dr Zhou Wang (Shanghai Jiao Tong University)
      • 15:50
        大型液氮低温系统氡测量与抑制 15m
        中国暗物质实验(CDEX)合作组计划在锦屏地下室二期开展百公斤量级的暗物质以及中微子实验探测,届时高纯锗阵列探测器将直接浸泡在约1700立方米大型液氮低温系统中。 液氮中的氡是可能的重要本底来源之一。本报告将汇报以下进展:1. 液闪级联探测器测量液氮中的氡含量;2. 低氡下的富集系统的研制;3. 低温下材料氡吸收以及氡迁移的研究。
        Speaker: Mr 任明杰 李 (四川大学)
        Slides
    • 14:00 16:00
      晨光杯报告与评审 (Chair: 王萌)
      Convener: Prof. Yangheng Zheng (University of Chinese Academy of Sciences)
      • 14:00
        Bayesian Extraction of Jet Energy Loss Distributions in Heavy-Ion Collisions 15m
        Speaker: Dr Yayun He (South China Normal University)
        Slides
      • 14:15
        Extraction of the 235U and 239Pu Antineutrino Spectra at Daya Bay 15m
        Speaker: 健润 胡 (高能所)
        Slides
      • 14:30
        B-tagging Calibration and Observation of Higgs Boson Decays to a pair of bottom quarks with the ATLAS Detector 15m
        Speaker: 昌樵 李 (Shanghai Jiao Tong University)
        Slides
      • 14:45
        Chiral phase transition of (2+ 1)-flavor QCD 15m
        Speaker: 胜泰 李
      • 15:00
        Ξc绝对衰变率的首次测量 15m
        Speaker: Yubo Li (Fudan University)
        Slides
      • 15:15
        Measurement of the mass difference and the binding energy of the hypertriton and antihype1iriton 15m
        Speaker: Peng Liu (Shanghai Institute of Applied Physics, Chinese Academy of Sciences)
        Slides
      • 15:30
        Precision Measurement of the Branching Fractions of η' Decays 15m
        Speaker: Yuming MA (Institute of high energy physics)
        Slides
      • 15:45
        Precision Study of η' → γπ + π− Decay Dynamics 15m
        Speaker: Liqing QIN (高能所)
    • 16:00 16:10
      Coffee Break 10m
    • 16:10 18:20
      Parallel Session III:Heavy Ion Physics: Jets (Chair: 秦广友)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 16:10
        Jet quenching and medium response 25m
        Speakers: Shanshan Cao, Shanshan Cao (Shandong University)
        Slides
      • 16:35
        Strangeness production in jets and underlying event in pp and p--Pb collisionis with ALICE 15m
        Speaker: Pengyao Cui (Central China Normal University)
      • 16:50
        Medium modification of jet substructure for inclusive, photon-tagged and heavy flavor jets in heavy-ion collisions 15m
        Speaker: Tan Luo (Central China Normal University)
      • 17:05
        Recent jet measurements in STAR and its future plan 15m
        Speaker: Nihar Sahoo (Shandong University)
      • 17:20
        Measurement of proton-Ξ correlation function in Au+Au Collisions at √s_NN = 200 GeV by STAR experiment at RHIC 15m
        Speaker: 柯 米 (Central China Normal University)
        Slides
      • 17:35
        Jet energy loss distributions and gradient tomography in heavy-ion collisions 15m
        Speaker: Dr Yayun He (South China Normal University)
        Slides
      • 17:50
        From hydro to jet quenching, coalescence and hadron cascade: a coupled approach to solving the $R_{AA}\otimes v_2$ puzzle in high-energy heavy-ion collisions 15m
        Speaker: Wenbin Zhao (school of physics Peking Uniersity)
        Slides
      • 18:05
        Search for the elusive jet-induced diffusion wake in high-energy heavy-ion collisions 15m
        Speaker: Zhong Yang
    • 16:10 18:10
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 16:10
        Exploration of the open-charm pentaquark states 20m
        We perform a systematic study on the interactions of the $\Sigma_c^{(*)}D^{(*)}$ systems within the framework of chiral effective field theory. We introduce the contact term, one-pion-exchange and two-pion-exchange contributions to describe the short-, long-, and intermediate-range interactions. The low energy constants of the $\Sigma_c^{(*)}D^{(*)}$ systems are estimated from the $N\bar{N}$ scattering data by introducing a quark level Lagrangian. With three solutions of LECs, all the $\Sigma_c^{(*)}D^{(*)}$ systems with isospin $I=1/2$ can form bound states, in which different inputs of LECs may lead to distinguishable mass spectra. In addition, we also investigate the interactions of the charmed-bottom $\Sigma_c^{(*)}\bar{B}^{(*)}$, $\Sigma_b^{(*)}D^{(*)}$, and $\Sigma_b^{(*)}\bar{B}^{(*)}$ systems. Among the obtained bound states, the bindings become deeper when the reduced masses of the corresponding systems are heavier.
        Speaker: Dr kan chen (Peking university)
        Slides
      • 16:30
        Interaction between J/ψJ/ψ from di-pion exchange with coupled channel FSI and possible bound state of J/ψJ/ψ. 20m
        In a recent measurement LHCb reported pronounced structures in the $J/\psi J/\psi$ spectrum. One of the various possible explanations of those is that they emerge from non-perturbative interactions of vector charmonia. It is thus important to understand whether it is possible to form a bound state of two charmonia. Two charmonia interact through the exchange of gluons, which hadronise into two pions at the longest distance. In this paper, we demonstrate that, given our current understanding of hadron-hadron interactions, the exchange of correlated light mesons (pions and kaons) is able to provide sizeable attraction to the di-$J/\psi$ system, and it is possible for two $J/\psi$ mesons to form a bound state. As a side result we find from an analysis of data for $\psi(2S)\to J/\psi \pi\pi$ including both $\pi\pi$ and $K\bar K$ final state interactions with $|\alpha_{\psi(2S)J/\psi}|= (1.575\pm 0.012)~\mbox{GeV}^{-3}$, an improved value for the $\psi(2S)\to J/\psi$ transition chromo-electric polarisability.
        Speaker: Mr Xiang-Kun Dong (ITP,CAS)
        Slides
      • 16:50
        Some remarks on Y(4260) 20m
        Reviewing the experimental and theoretical status of Y(4260), the presentation will discuss the nature of Y(4260) from five aspects: mass predicted by potential model, OZI-suppessed/-allowed decays, non-peak in R scan, leptonic width, and radiative width. In the end, we are going to give a brief summary and prospect.
        Speaker: Mr Hongrong Qi (Tsinghua University)
        Slides
      • 17:10
        Charm-Strange meson from Lattice QCD and Hamiltonian Effective Field Theory 20m
        We first incorporate the relativized quark model and 3P0 model into HEFT to investigate the coupled-channel effects, and further study the impact on the masses of exotic state with Lattice simulation.
        Speaker: 智 杨 (电子科技大学)
        Slides
      • 17:30
        Recent results of tetraquark states at LHCb 20m
        Exotic hadrons can provide rich information to further understand the strong interaction between quarks and gluons. Many tetraquark states containing charm quarks have been discovered by the LHCb experiment since the start of the Large Hadron Collider. This talk presents recent observations of heavy-flavour tetraquark states.
        Speaker: 志宏 沈 (Peking University)
        Slides
      • 17:50
        Recent results of pentaquark states at LHCb 20m
        Since the first observation of pentaquark candidates by LHCb in 2015, much efforts have been made from both theoretical and experimental sides to understand the nature of pentaquark states. This talk presents latest results of pentaquark states from the LHCb experiment.
        Speaker: Bo Fang (Wuhan University)
        Slides
    • 16:10 18:15
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 16:10
        AMS宇宙线正电子流强谱测量结果 20m
        AMS合作组基于190万正电子事例数精确测量得到0.5GeV-1TeV宇宙线正电子流强谱结果。测量结果表明:1. 正电子流强谱在25.2GeV以上开始有明显相对于单一幂率谱的超出;2. 在284GeV以上能区流强谱迅速下降;3. 在整个能区正电子流强谱可以很好地用宇宙线传播模型加一个高能区域的正电子源进行描述; 4. 正电子流强谱在高能区域迅速下降的截止能量为810GeV,置信度大于4倍sigma。这表明高能区域的正电子主要来自暗物质湮灭或者新的天体源。
        Speaker: Mr 祖豪 李 (高能所粒子天体)
        Slides
      • 16:30
        AMS宇宙线反质子流强谱测量结果及原初宇宙线带电基本粒子的流强谱性质 15m
        报告展示AMS测量得到的原初宇宙线带电基本粒子在1GV至2000GV刚度绝对值区域内的流强谱结果及流强谱比率。在60GV至500GV的刚度绝对值区域内,反质子、质子和正电子流强谱有近乎一致的随刚度变化趋势,而与电子流强谱的随刚度变化趋势不同。在60GV之下,反质子与质子比率,反质子与正电子比率以及质子与正电子比率均已达到最大值。特别值得一提的是更新了原初宇宙线带电基本粒子流强谱在500GV以上能区的结果。
        Speaker: Dr 志成 唐 (高能所)
        Slides
      • 16:45
        AMS宇宙线氖镁硅原子核流强谱测量结果 15m
        报告展示AMS测量得到的原初宇宙线氖镁硅原子核流强谱在2.15GV至3TV刚度能区的精确结果。流强谱分析基于AMS收集的180万氖原子核事例、220万镁原子核事例以及160万硅原子核事例。从流强谱结果可以看到:氖和镁原子核流强谱在3.65GV以上能区有一致的随刚度变化趋势;在86.5GV以上能区氖、镁和硅三者均有一致的随刚度变化趋势; 在200GV以上能区三者流强谱一致上升,不服从单一幂律谱。尤其出乎意料的是,86.5GV以上能区氖、镁和硅原子核流强谱的一致性随刚度变化趋势与同样是初级宇宙线的氦、碳和氧原子核的随刚度变化趋势并不相同。这说明氖镁硅和氦碳氧属于两种不同类型的初级宇宙线。
        Speaker: Dr 诚 张 (高能所)
        Slides
      • 17:00
        AMS宇宙线氟原子核流强谱结果 15m
        报告展示AMS测量得到的宇宙线氟原子核流强谱在2.15 GV至2.9 TV刚度能区的精确结果,基于收集到的29万氟原子核事例。从流强谱结果可以看到:氟原子核流强谱在200GV以上能区不服从单一幂律谱;重核次级-初级宇宙线比率(F/Si)的随刚度变化趋势与轻核的次级-初级宇宙线比率(B/O或B/C)不同,具体而言10GV以上能区(F/Si)/(B/O)可以用单一幂指数分布描述(幂率为0.052±0.007)。这说明氟到硅的重核宇宙线与氦到氧的轻核宇宙线有不同的宇宙线传播机制,且有两种不同类型的次级宇宙线:氦碳氧和氟。
        Speaker: 扈嘉钰
        Slides
      • 17:15
        基于AMS实验测量初级宇宙线铁原子核能谱 15m
        宇宙线铁原子核主要在天体源内产生并加速,对铁原子核流强在GV至TV磁刚度(动量/电荷)区间内的精确测量有助于加深对宇宙线起源与加速机制的理解。基于国际空间站上阿尔法磁谱仪(AMS)实验收集的62万初级宇宙线铁原子核建立的2.65GV至3.0TV能谱显示出新的能谱特征。AMS铁能谱在200GV处偏离单一幂律谱。出乎意料之外,在80.5GV以上,铁原子核流强与初级宇宙线氦、碳、氧原子核具有相同的磁刚度依赖特性,铁、氧流强比为常量0.155+/-0.006。这一结果显示宇宙线铁与电荷数较小的初级宇宙线氦、碳、氧原子核属于同一类别,而不同于另一类电荷数较大的初级宇宙线氖、镁、硅原子核。
        Speaker: Dr 兆民 王 (山东高等技术研究院)
        Slides
      • 17:30
        阿尔法磁谱仪宇宙线同位素探测进展 15m
        阿尔法磁谱仪(AMS)实验位于国际空间站,是目前唯一在外太空运行的大型磁谱仪实验,自2011年5月运作以来,已采集了超过1700亿宇宙线事例。通常认为,宇宙线锂和铍原子核的主要起源是初级宇宙线在传播中的碎裂过程。因此宇宙线锂铍能谱的精确测量结果是宇宙线传播与起源研究的必要实验数据,而二者在宇宙线中的同位素组分将为宇宙线研究提供新的视角。其中铍原子核的同位素比值,10Be/9Be,可作为研究宇宙线在银河系中居留时间的放射性时钟。基于AMS运行8.5年以来的宇宙线数据, 本次报告将介绍宇宙线锂原子核同位素(6Li和7Li)以及铍原子核同位素(7Be、9Be和10Be)的能谱以及同位素比值的测量结果。
        Speaker: 尧 陈 (S)
      • 17:45
        AMS宇宙线正负电子流强谱随时间变化测量 15m
        报告展示AMS测量得到的正负电子流强谱在2011年5月20日至2019年10月29日期间以月为单位的随时间变化结果。给出了超过半个太阳周期范围内的不同时间尺度下与太阳活动有关的流强谱随时间变化情况,并探讨了不同电荷粒子随时间变化的区别。
        Speaker: Dr Zetong Sun (IHEP)
        Slides
      • 18:00
        阿尔法磁谱仪中硅微条探测器的位置刻度以及径迹重建算法 15m
        AMS-02 探测器是多物理目标、广能量探测范围、高统计量、大接收度的外太空磁谱仪。因其拥有独特的永久磁铁结构,使得 AMS-02 能够区分宇宙射线粒子电荷正负,即AMS-02是外太空中能够直接测量反物质的探测器。 宇宙射线粒子进入 AMS-02 探测器,在磁场中发生偏转,其运动轨迹通过径迹探测器获得。为了快速重建宇宙射线轨迹,报告人创新性构建了Cellular Automaton网络算法,并将该算法应用于带电粒子在径迹探测的模式识别工作中,使其探测效率提升20%以上,并保持了极低的重建错误率,基于此推进了AMS-02的数据重建版本PASS7。 AMS运行在外太空的复杂的热力学环境中,在每隔92分钟的热力学周期中,硅微条探测器受到支撑框架以及硅微条本身的热力学膨胀和收缩的影响,其位置测量精度会降低。本次报告将详细描述通过机器学习算法将径迹探测器的周期性移动进行修正和刻度的过程,使其长期工作稳定在2微米。通过机器学习算法得到的刻度,是不依赖统计量的修正,为AMS任何复杂环境下的运行都提供了及时可靠的径迹探测器数据。
        Speaker: Mr 朝义 渠 (山东高等技术研究院)
    • 16:10 18:10
      Parallel Session I:TeV and BSM Physics: (Chair: Hao Zhang)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Hao ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University)
      • 16:10
        Search for tri-boson resonance at the LHC with the CMS detector 15m
        The first search for resonances decaying into a radion and a W boson in proton-proton collision data recorded by the CMS detector at sqrt(s)=13 TeV corresponding to an integrated luminosity of 137 fb−1 is reported. The radion is reconstructed through its decay into two W bosons. We require the presence of one isolated lepton and missing transverse momentum from a leptonic W boson decay, and either one or two massive large-radius jets containing the decay products of the other two W bosons. No excess over the background estimation is observed and upper limits are set on model parameters. See more details in CMS-PAS-B2G-20-001 (to be submitted to PRL)
        Speakers: 旭东 吕 (北京大学) , 旭东 吕 (Peking University)
        Slides
      • 16:25
        Search for top-quark decays tHq in ditau final state with 36 fb^{-1} of pp collision data at s =13 TeV with the ATLAS detector 15m
        A search for flavor-changing neutral current decays of a top quark into an up-type quark (q=u,c) and the Standard Model Higgs boson, t→Hq, is presented. The search is based on a dataset of pp collisions at s√=13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb−1. Two complementary analyses are performed that search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the H→bb¯ and H→τ+τ− decay modes, respectively. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t→Hc and t→Hu branching ratios of 1.1X10−3 (8.3X10−4) and 1.2X10−3 (8.3X10−4), respectively. The corresponding combined observed (expected) upper limits on the |λtcH| and |λtuH| couplings are 0.064 (0.055) and 0.066 (0.055), respectively
        Speaker: mingming xia (Tsinghua University)
        Slides
      • 16:40
        ColliderBit-Solo: a new tool for reinterpreting LHC results for BSM 15m
        ColliderBit is a GAMBIT module for the calculation of high energy collider observables in theories of physics beyond the Standard Model. ColliderBit features a unique parallelised Monte Carlo event generation scheme suitable for large-scale supercomputer applications, and a number of LHC analyses, covering a reasonable range of the BSM signatures currently sought by ATLAS and CMS. To use it as a standalone tool for efficiently applying collider constraints to theories of new physics, we develop a new code, ColliderBit-Solo, which accepts simulated event files for any model. In this talk, we will present features and usage of ColliderBit-Solo, as well as comparisons with CheckMATE and MadAnalysis.
        Speaker: Dr Yang Zhang (Zhengzhou University)
      • 16:55
        Higgs Alignment and Novel CP-Violating Observables in 2HDM 15m
        Null results from searches for new physics at the Large Hadron Collider (LHC) enforce the belief that new particles must be much heavier than the weak scale. We undertake a systematic study of the interplay between Higgs alignment and CP-violation in complex two-Higgs-doublet models (C2HDMs), which enables us to construct a CP-violating scenario where new Higgs bosons are close to the weak scale after including stringent constraints from the electric dipole moment and measurements at the LHC. In addition, we propose a smoking-gun signal of CP-violation in the Higgs-to-Higgs decay, (h3 → h2h1 → 3h1), where h3,h2, and h1 are the heaviest, second heaviest and the SM-like neutral Higgs bosons, respectively. The mere presence of this decay channel is sufficient to establish CP-violation in C2HDMs. The final state with three 125 GeV Higgs bosons is distinct and provides a unique venue for new measurements at the LHC.
        Speaker: Prof. Xiaoping Wang (Beihang University)
      • 17:10
        高亮度正负电子对撞机上隐藏区间的唯象学研究 15m
        粒子物理学中的一些基本问题,如中微子质量和振荡的起源、暗物质的自然属性以及重子生成机制等,仍待回答。一种可行的方案是引入隐藏区间。目前对于隐藏区间的寻找,尤其高能量前沿的LHC实验,还没有任何明确的信号,因此人们逐渐转向了高亮度前沿对于MeV到GeV质量范围的新粒子的探测。诸如我国的BESIII等高亮度正负电子对撞机实验是高亮度前沿的重要代表。特别地,它们的运行能区对MeV到GeV质量范围的新粒子的探索有着独特的优势。本报告将针对一些典型的隐藏区间粒子,探讨BESIII等高亮度正负电子对撞机实验对于它们的探测潜力。
        Speaker: Prof. Yu Zhang (Anhui University)
      • 17:25
        Challenges for a QCD Axion at the 10 MeV Scale 15m
        We report on an interesting realization of the QCD axion, with mass in the range (10) MeV. It has previously been shown that although this scenario is stringently constrained from multiple sources, the model remains viable for a range of parameters that leads to an explanation of the Atomki experiment anomaly. In this article we study in more detail the additional constraints proceeding from recent low energy experiments and study the compatibility of the allowed parameter space with the one leading to consistency of the most recent measurements of the electron anomalous magnetic moment and the fine structure constant. We further provide an ultraviolet completion of this axion variant and show the conditions under which it may lead to the observed quark masses and CKM mixing angles, and remain consistent with experimental constraints on the extended scalar sector appearing in this Standard Model extension. In particular, the decay of the Standard Model-like Higgs boson into two light axions may be relevant and leads to a novel Higgs boson signature that may be searched for at the LHC in the near future.
        Speaker: Jia Liu (Peking University)
      • 17:40
        An SU(6) Axion Model 15m
        A high-quality axion is suggested to arise from the non-minimal unification model with the SU(6) group, due to its enhanced global symmetry. The physical axion in the model satisfies the Peccei-Quinn quality condition without fine-tuning, and can be searched for in the upcoming IAXO experiment. We also find the SU(6) model can naturally avoid the potential cosmological constraints of the conventional axion models, and realize the type-I seesaw mechanism and the type-II two-Higgs-doublet model. Some future efforts in the non-minimal unification models will be briefly discussed.
        Speaker: 宁 陈 (Nankai University)
    • 16:10 18:00
      Parallel Session V:Particle Detector Technology
      Convener: Dr qian yue (Tsinghua Univerisity)
      • 16:10
        The Cryogenics and Xenon handling system for the PandaX-4T Experiment 20m
        PandaX-4T, the new generation of the PandaX detector, is a xenon dual-phase detector with about six tons of liquid xenon as target for dark matter search. A cryogenics and xenon handling system is designed to liquify and purify this large detector. In this report, the results on the commission of the cryogenics and gas handling system are reported. The maximum cooling power of ~ 580 W at 178 K with three cooperating coldheads has been achieved. The filling rate with an assisted liquid nitrogen cooling can reach ~ 700 kg/day. The average rate of recuperation by liquid nitrogen is around 440 kg/day. The maximum total purification speed of two circulation loops is up to ~ 155 slpm. Each loop is using a large heat exchanger with a measured heat exchange efficiency of $\sim 97.5\pm0.5\%$.
        Speaker: Dr Li Zhao (Shanghai JiaoTong University)
        Slides
      • 16:30
        CDEX-300ν实验中的液氩反符合技术预研 15m
        液氩反符合技术是压低高纯锗稀有事例探测实验本底的有效方法,国际上基于高纯锗的低本底实验如GERDA应用液氩反符合技术已经取得了非常好的效果。CDEX实验在开拓液氮作为屏蔽体的直冷介质技术路线的同时,也在积极开展液氩反符合技术的研究。目前正在开展的三百公斤级富集76Ge的高纯锗阵列实验(CDEX-300ν)计划采用液氩反符合技术压低本底。本报告将讨论液氩光学系统的模拟方面的最新进展、液氩光学系统的初步设计,以及光收集与读出性能的初步模拟结果等。主要内容包括:(1)不同读出方式(光纤与光导)的光传输性能;(2)探测器系统在闪烁体中的能量沉积地图;(3)探测器系统结合不同光读出结构的实际反符合性能与极限反符合性能,为后续反符合系统的细化设计与性能优化提供依据。
        Speaker: 震宇 张 (清华大学)
      • 16:45
        Construction of readout electronics system for CEPC ScECAL 15m
        To acquire the feature of Higgs particle, construction of Circular Electron Positron Collider (CEPC) was proposed in recent years. Electromagnetic calorimeter based on scintillator and SiPM (ScECAL) is one of the options of the electromagnetic calorimeter system of CEPC. ScECAL Electronic prototype was constructed to verify the feasibility. Special readout electronics system was built to meet the demands of ScECAL prototype. The ScECAL prototype contains 32 layers of basic units which hold 6720 scintillators coupled with SiPM in total. To improve the performance of prototype, the readout electronics system was highly embedded in the prototype by using special design and difficult craft. The readout system also comes with a low power consumption which is about 8mW per channel and this is important in improving integration. There are 2 calibration system integrated in the prototype: electronic calibration system and light calibration system, which could calibrate the front-end electronics system and the condition of SiPM respectively. Besides, a temperature monitor and high voltage feedback strategy is adopted in the prototype because the gain of SiPM highly depands on temperature.
        Speaker: Mr anshun zhou (USTC)
        Slides
      • 17:00
        Design of the Prototype Readout Electronic System of the Liquid Argon Detector for Direct Dark Matter Detection 15m
        To meet the signal readout requirements of the ton-level prototype based on liquid argon(Lar)detector for the direct detection of dark matter, this report has designed a high-speed waveform digital readout electronics system based on the PXIe technology platform. The system uses multiple waveforms digitizing modules and a clock trigger module, which has good flexibility and scalability. For a single chassis, through the communication between the clock trigger module and the waveform acquisition module, the synchronization acquisition of 52 PMTs readout signals can be realized. For hundreds of PMT readout channels in the future, this design can achieve system expansion through the cascading of trigger modules in multiple chassis.
        Speaker: Mr Keqing Zhao (ustc)
        Slides
      • 17:15
        Development and Progress of the Readout Electronics for STCF ECAL 15m
        Super Tau-Charm Facility (STCF) is one of important options for accelerator-based particle physics after Beijing Electron-Positron Collider (BEPC-II) in China, which aims at ultra-precise measurement and new physics search in tau-charm energy region with about 100 times higher luminosity. The electromagnetic calorimeter (ECAL), as an important part of the spectrometer, needs to meet the demand of high-efficiency and high-resolution gamma detection, electron and hadron discrimination, etc. STCF ECAL is designed as a fully absorbing detector, and its absorber is selected as Pure CsI (pCsI) owing to the fast response (30 ns decay time), high mass density and good radiation hardness. Due to the relatively low light yield of pCsI and the strong magnetic environment in the experiment, avalanche photodiode (APD) is adopted to convert the scintillation light into current signal with a gain of about 50. Based on the detection unit composed of pCsI and APD, the readout electronics needs to meet the following requirements according to simulation: - 6732 crystals in barrel, 1938 crystals in endcap - Single channel hit rate about 400 kHz in barrel and 3 MHz in endcap - High background about 1 MHz in barrel and 10 MHz in endcap - Dynamic range from 2 fC to 2000 fC with input equivalent noise charge less than 0.4 fC - Time resolution better than 150 ps (1GeV) for γ/ n separation Charge sensitive amplifier (CSA) is selected to measure the scintillation current from APD. By optimization of amplification stage and shaping time, the readout electronics realizes a noise performance of about 0.16 fC with one S8664-0505 APD. In time measurement, a time resolution better than 150 ps is achieved with leading-edge timing and Time-to-Digital Converter (TDC) integrated in Field-Programmable Gate Array (FPGA). Due to the high luminosity of STCF, the time information of piled up signals would be lost in leading-edge timing. Time measurement based on waveform fitting is also studied and a similar performance is also realized, which satisfies the requirements.
        Speaker: 来富 罗 (University of Science and Technology of China)
        Slides
      • 17:30
        低能康普顿散射电子标定高增益电路的研究 15m
        硅探测器因具备优异的位置与能量分辨,时间响应以及抗辐照性能等特点被广泛应用于带电粒子的探测中,尤其是对撞机实验中的顶点探测器以及径迹探测器中。针对其各方面性能的研究工作已广泛开展,为了满足更高抗辐照性能的需求,芯片更倾向于使用更薄的厚度,如ATLICE ITS 的内层单片式硅探测器为50 微米厚。更薄的探测器同时也意味着更少的电荷收集,更小的信号,以及更高增益的放大电路。因此需要低能(小于6 keV)的粒子源来测试标定这类芯片,如传感器能量刻度以及电路增益标定。常见放射源难以满足需求,因此引入了康普顿散射效应来提供单能,低能(能量连续可调)的散射电子,完成对芯片增益标定以及能量刻度。 利用康普顿散射效应进行能量标定已广泛应用于闪烁体的能量标定中,本报告提出并描述利用这一效应对单片式硅像素芯片(JadePix-1)电路增益标定的研究:使用X-ray设备提供固定能谱的X射线,借助X射线探测器(X-123)探测不同散射角度的能谱并提供触发,达到使用多个单能的低能散射电子对芯片进行测试的目的。并对这一方法可行性以及精度进行探究,同时对比模拟结果深入理解这一方法的系统误差。
        Speakers: HAN Yubo (IHEP) , Dr Hongbo ZHU (IHEP)
        Slides
      • 17:45
        PandaX-4T电子学与触发系统 15m
        PandaX(Particle and Astrophysical Xenon Experiments)实验以暗物质和中微子探测为主要物理目标,探测器采用流行的“二相型氙”技术, 来测量可能的暗物质候选者或者中微子与氙原子核发生弹性碰撞所留下的微弱信号。其中最新的PandaX-4T探测器,具有4吨的有效探测质量,其读出方式仍然采用光电倍增管配合商业波形采样插件的形式来实现。 在本报告中,报告人将系统的阐述PandaX-4T实验电子学在PandaX-II实验电子学基础上的改进和升级,包括引入无触发运行模式、升级读出通道数、升级信号采样率和采样带宽,以及改善DAQ软件框架。同时本报告中,报告人还将汇报基于分布式实时数据收集方法的PandaX-4T触发系统的相关进展。
        Speaker: Mr 祥祥 任 (山东大学)
        Slides
    • 16:10 18:10
      晨光杯报告与评审 (Chair: 王萌)
      Convener: Xiaoyan Shen (IHEP)
      • 16:10
        Measurement of Proton Electromagnetic Form Factors in e + e − → p p¯ in the Energy Region 2.00–3.08 GeV 15m
        Speaker: Dr Lei Xia (University of Science and Technology of China)
        Slides
      • 16:25
        Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory 15m
        Speaker: Dr 丽桃 杨 (Tsinghua University)
        Slides
      • 16:40
        Study of e + e − → γωJ/ψ and Observation of X(3872) → ωJ/ψ 15m
        Speaker: Junhao YIN (高能所)
      • 16:55
        Observation of a Resonant Structure in e+ e − → K+K− π0π0 15m
        Speaker: Mr Yateng Zhang (ZZU)
      • 17:10
        Committee discussion 50m
    • 08:30 10:35
      Parallel Session III:Heavy Ion Physics: CD Phase Structure (Chair: 王群)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 08:30
        Correlated Dirac eigenvalues and axial anomaly in chiral symmetric QCD 25m
        Speaker: Prof. Heng-Tong Ding (Central China Normal University)
        Slides
      • 08:55
        Recent heavy-ion results from STAR 25m
        Speaker: 相雷 朱
        Slides
      • 09:20
        Momentum dependence of light nuclei production in p-p, p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider 15m
        Speakers: Ms Ruiqin Wang (Qufu Normal Univercity) , 瑞芹 王
        Slides
      • 09:35
        Intermittency analysis of proton numbers in relativistic heavy-ion collisions 15m
        Speakers: 治明 李, 治明 李 (华中师范大学粒子物理研究所)
        Slides
      • 09:50
        Light and strange hadron production and anisotropic flow measurement in Au + Au collisions at $\sqrt{s_{\rm NN}}=3$ GeV from STAR experiment 15m
        Speaker: Yingjie Zhou (Central China Normal University)
        Slides
      • 10:05
        Non-Gaussian shaped density profile in light nuclei production in heavy ion collision 15m
        Speaker: 善进 吴
      • 10:20
        Fluctuations and correlations of net baryon number, electric charge and strangeness in a background magnetic field 15m
        Speaker: Mr Sheng-Tai Li (CCNU)
        Slides
    • 08:30 10:30
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 08:30
        The contribution of QCD trace anomaly to hadron mass 20m
        We present the first Lattice QCD calculation of the quark and gluon trace anomaly contributions to the hadron masses, using the overlap fermion on the 2+1 flavor dynamical Domain wall quark ensemble. The result shows that the gluon trace anomaly contributes to most of the nucleon mass, and the contribution in the pion state is smaller than that in others.
        Speaker: Dr Fangcheng HE (Institute for Theoretical Physics, CAS)
        Slides
      • 08:50
        Determination of some quantities and mixed action effect in lattice QCD 20m
        We will present the pion mass and decay constant using the overlap fermion valence on DW fermion sea at several lattice lattice spacings. The mixed action effect in the lattice calculation is also studied, and the result suggests that the mixed action effect with overlap valence on DW sea would be proportional to the fourth power of the lattice spacing.The preliminary determination of the light and strange quark mass m-(u,d,s), F and chiral condensate \Sigma-in the N-f=2chiral limit will also be presented.
        Speaker: Mr Dianjun Zhao (Institute of Theoretical Physics,Chinese Academy of Sciences)
        Slides
      • 09:10
        The mixing of $$\eta_c$$ and the Pseudoscalar Glueball 20m
        The first lattice QCD study of the mixing of $\eta_c$ and pseudoscalar glueball was performed. We generated two large ensembles of gauge configuration with $N_f=2$ degenerate charm quarks on anisotropic lattices, with spatial lattice spacing $a_s=0.1026$ fm and anistropy $\xi=5$, where the charm sea quark mass was tuned to give vector charmonium $J/\psi$ mass $m_{J/\psi}= 2743$ and $3068$ MeV. The correlation functions of the charm quark bilinear operator and the glueball operator were calculated on these ensembles with the charm quark loops computed through the distillation method. Subsequently the mixing angle between $\eta_c$ and the psuedoscalar glueball was extracted to be $7.1(9)^\circ$ and $4.3(4)^\circ$ on these two ensembles, respectively, which provides an important theoretical input in order to understand the properties of $\eta_c$.
        Speaker: Mr Ren-qiang Zhang (IHEP)
      • 09:30
        Dibaryon with highest charm number near unitarity from lattice QCD 20m
        A pair of triply charmed baryons, $\Omega_{ccc}\Omega_{ccc}$, is studied as an ideal dibaryon system by (2+1)-flavor lattice QCD with nearly physical light-quark masses and the relativistic heavy quark action with the physical charm quark mass. The spatial baryon-baryon correlation is related to their scattering parameters on the basis of the HAL QCD method. The $\Omega_{ccc}\Omega_{ccc}$ in the ${^1S_0}$ channel taking into account the Coulomb repulsion with the charge form factor of $\Omega_{ccc}$ leads to the scattering length $a^{\rm C}_0\simeq -19~\text{fm}$ and the effective range $r^{\rm C}_{\mathrm{eff}}\simeq 0.45~\text{fm}$. The ratio $r^{\rm C}_{\mathrm{eff}}/a^{\rm C}_0 \simeq -0.024$, whose magnitude is considerably smaller than that of the dineutron ($-0.149$), indicates that $\Omega_{ccc}\Omega_{ccc}$ is located in the unitary regime.
        Speaker: Hui Tong (s)
      • 09:50
        A new method for a lattice QCD calculation of ηc→2γ 20m
        The two-photon decay process ηc→2γ can provide an ideal testing ground for the understanding of nonperturbative nature of QCD. In this study, we propose a direct method to calculate the matrix element of a hadron decaying to two-photon. Various systematic effects are examined in this work. The method developed here can also be applied for other processes which involve the leptonic or radiative particles in the final states.
        Speaker: Dr Yu Meng (CHEP, Peking University)
        Slides
      • 10:10
        Trace anomaly contribution to hydrogen atom mass 20m
        Trace anomaly contribution to hydrogen atom mass
        Speaker: Bao-Dong Sun (Shandong University, QingDao)
        Slides
    • 08:30 10:30
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 08:30
        宇宙线电子的起源 15m
        阿尔法磁谱仪(AMS)实验基于在国际空间站所收集的2800万个电子事例,测量了在0.5GeV-1.4 TeV能量范围内宇宙线电子流强。实验结果显示,电子和正电子流强无论在强度还是在能量依赖关系上都有明显的区别。电子流强在41.2 GeV出开始明显超出其在低能区间的变化趋势,但是该超出与正电子起始于25.2 GeV处的超出有着本质的区别。正电子在810 GeV处存在指数型截止能量,而电子能谱以超过5倍显著性排除了能量低于1.9 TeV的截止能量。AMS电子能谱在整个能量区间可以描述为两个幂律谱的叠加。AMS结果表明高能电子和正电子存在不同的起源。
        Speaker: 伟伟 许 (Shandong University)
        Slides
      • 08:45
        AMS实验每天电子流强的测量与周期性特征分析 15m
        本报告将介绍阿尔法磁谱仪(AMS)实验关于每天的宇宙线电子流强的新结果。通过测量和分析宇宙线电子自2011年5月20日至2019年10月29日的流强变化,揭示出电子流强具有不同时间尺度的周期性特征,并与太阳自转等周期性太阳活动存在一定的关联。本报告还将详细对比AMS实验测量的质子(Z=+1)和电子(Z=-1)的流强变化,研究太阳活动对于不同电荷符号的宇宙线粒子产生的不同调制现象。
        Speaker: Dr Tong Su (Shandong Institute of Advanced Technology)
        Slides
      • 09:00
        FIMP Dark Matter from Leptogenesis in Fast Expanding Universe 15m
        Within the framework of canonical type-I seesaw, a feebly interacting massive particle (FIMP) $\chi$ is introduced as a dark matter candidate. The leptogenesis mechanism and dark matter relic density share a common origin via decays of Majorana neutrinos $N$. Provided an additional species $\varphi$ whose energy density red-shifts as $\rho_{\varphi}\propto a^{-(4+n)}$, the Hubble expansion rate is larger than the standard scenario, i.e., the Universe expands faster. The consequences of such a fast expanding Universe on leptogenesis as well as FIMP dark matter are investigated in detail. We demonstrate a significant impact on the final baryon asymmetry and dark matter abundance due to the existence of $\varphi$ for the strong washout scenario. While for the weak washout scenario, the effects of FEU are relatively small. We introduce scale factors $F_L$ and $F_\chi$ to describe the corresponding effects of FEU. A semi-analytical approach to derive the efficiency factors $\eta_L$ and $\eta_\chi$ in FEU is also discussed. The viable parameter space for success thermal leptogenesis and correct FIMP DM relic density is obtained for standard cosmology and FEU. Our results show that it is possible to distinguish different cosmology scenarios for strong washout cases.
        Speaker: Dr Zhi-Long Han (济南大学)
        Slides
      • 09:30
        New approaches to explore dark matter 15m
        We study new approaches to explore light dark matter by radio telescope (SKA,Fast) based on the resonant conversion effects.
        Speaker: Fa Peng Huang (Sun Yat-Sen (Zhongshan) University)
        Slides
      • 09:45
        Exploring axion dark matter through radio signals from magnetic white dwarf stars 15m
        Axion as one of the promising dark matter candidates can be detected through narrow radio lines emitted from the magnetic white dwarf stars. Due to the existence of the strong magnetic field, the axion may be resonantly converted into the radio photon, when it passes through a narrow region in the corona of the magnetic white dwarf, where the plasma frequency is equal to the axion mass. We investigate the sensitivity of the future radio telescope to the signature from the nearby magnetic white dwarf, and compare it with the sensitivity to the neutron star.
        Speaker: Dr Peng-Fei Yin (IHEP)
      • 10:00
        Dark Matter Freeze-out via Catalyzed Annihilaiton 15m
        We present a novel paradigm of dark matter freeze-out in the early universe, named "catalyzed freeze-out", in which the freeze-out of dark matter is controlled by catalyzed reactions. We discuss in detail the regime that the depletion of dark matter proceeds via $2\chi \to 2A'$ and $3A' \to 2\chi$ processes, in which $\chi$ and $A'$ denote dark matter and the catalyst respectively.
        Speaker: Mr 传阳(Chuan-Yang) 邢(Xing) (北京大学(Peking University))
        Slides
    • 08:30 10:30
      Parallel Session I:TeV and BSM Physics: (Chair: Yusheng Wu)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 08:30
        Combination of Higgs boson measurements with data collected during ATLAS Run2 20m
        The combination of the Higgs boson measurements will be introduced. It is based on the analyses of the Higgs decays to yy, ZZ*, WW*, tautau, bb, mumu and searches for invisible decays. Up to 139 ifb of pp collision data collected by the ATLAS detector are used. The combined cross section measurement are presented for the main production modes, such as ggF, VBF, VH and ttH. The simplified template cross section measurement are also shown. The results are interpreted in terms of the kappa framework and used to set exclusion limits on the parameters in BSM. No significant deviation from SM are observed.
        Speaker: Changqiao LI (Shanghai Jiao Tong U.)
      • 08:50
        Constraints on anomalous couplings of the Higgs boson to vector bosons and fermions with the CMS detector 20m
        Studies of CP violation and anomalous couplings of the Higgs boson to vector bosons and fermions are presented. The data were acquired by the CMS experiment at the LHC and correspond to an integrated luminosity of 137 fb−1 at a proton-proton collision energy of 13 TeV. The kinematic effects in the Higgs boson's four-lepton decay H → 4ℓ and its production in association with two jets, a vector boson, or top quarks are analyzed, using a full detector simulation and matrix element techniques to identify the production mechanisms and to increase sensitivity to the Higgs boson tensor structure of the interactions. See more details in arXiv:2104.12152.
        Speaker: RenQi Pan (Zhejiang University)
      • 09:10
        Search for Higgs boson pair production in the bbττ decay channel using 13 TeV pp collision data from the ATLAS detector 20m
        A search for non-resonant and resonant Higgs boson pair production in bbττ final states is presented, using a pp collision data set with an integrated luminosity of 139 fb−1 collected at s=√13 TeV by the ATLAS experiment at the LHC. Events with at least one τ-lepton decays hadronically are considered, and multivariate analysis techniques are used to extract the signals. The talk will show an overview of the physics motivation, the analysis methodology as well as the preliminary results.
        Speaker: 博文 张 (Nanjing University)
        Slides
      • 09:30
        Search for Higgs boson pair production at CMS 20m
        Recent search for Higgs boson pair production at CMS will be presented. See more details in JHEP 03 (2021) 257, CMS-PAS-HIG-20-004, CMS-PAS-HIG-20-005
        Speaker: Jin Wang (IHEP)
        Slides
      • 09:50
        Higgs boson pair production via gluon fusion at N3LO in QCD 20m
        We present next-to-next-to-next-to-leading order (N3LO) QCD predictions for the Higgs boson pair production via gluon fusion at hadron colliders in the infinite top-quark mass limit. Besides the inclusive total cross sections at various collision energies, we also provide the invariant mass distribution of the Higgs boson pair. Our results show that the N3LO QCD corrections enhance the next-to-next-to- leading order cross section by 3.0% (2.7%) at √s = 13 (100) TeV, while the scale uncertainty is reduced substantially below 3% (2%). We also find that a judicious scale choice can significantly improve the perturbative convergence. For the invariant mass distribution, our calculation demonstrates that the N3LO corrections improve the scale dependence but almost do not change the shape.
        Speaker: Jian Wang (Shandong University)
        Slides
      • 10:10
        Higgs self-coupling measurement at ATLAS 20m
        Higgs self-coupling measurement at ATLAS
        Speaker: Dr yanping huang (ihep)
    • 08:30 10:20
      Parallel Session V:Particle Detector Technology
      Convener: Dr Jianbei Liu (University of Science and Technology of China)
      • 08:30
        新型多通道读出电子学在粒子探测器中的应用 20m
        当今粒子探测器正朝着高定位精度、高通道密度的方向发展,这对前端读出电子学系统提出了更高的要求。本报告将介绍一种基于放大器的电荷测量技术,避开了ASIC设计周期长、复杂度高等的缺点,适应新型粒子探测器的快速研发。这种电荷测量方案,不像传统积分滤波(QAC)+模数变换(ADC)的测量方案,而是直接对电荷进行数字化(QDC)。此种电路结构简单,利用FPGA的多输入输出管脚I/O的优势,可实现上百通道的电荷测量。这套系统分上、下两层板设计,采用交叠结构,以此减小整个系统的尺寸。上层板包含模拟部分,如放大器,电容、电阻等;下层板主要包含FPGA的控制电路。我们测试了这种电路的噪声和线性,并结合数字SiPM的信号读出,对这种电路的多通道读出能力做了验证。
        Speaker: Dr 坤 胡 (山东大学)
      • 08:50
        Development of High Voltage CMOS based Silicon Tracker for CEPC 15m
        The Silicon Tracker covering large area is a key component of the tracking system for CEPC detector. One of the most promising technology options is the high voltage CMOS (HV-CMOS) for its high position resolution and cost-effectiveness. Tests and deveopment based on ATLASPix3, a HV-CMOS sensor will be introduced. The plan for a demonstrator stave and preliminary consideration for the system design will also be discussed.
        Speaker: Yiming 一鸣 Li 李 (IHEP)
        Slides
      • 09:05
        Development of IHEP low gain avalanche devices for ATLAS HGTD project 15m
        Low- Gain Avalanche Detector (LGAD) with time resolution better than 50ps has been choose as the sensors for HGTD project and have so far been developed by several institutes. This talk will show measurement results of first version LGAD sensors designed by the Institute of High Energy Physics (IHEP) and fabricated by Institute of Micro Electronics (IME). Time resolution of IHEP-IMEv1 sensors are better than 35ps and the collected charges are larger than 20fC before irradiation. The properties of IHEP-IMEv1 sensors fulfill the required specifications of sensors before irradiation for ATLAS HGTD project. Second version of LGAD sensors, IHEP-IMEv2, including 15×15 sensor arrays, will optimize carbon injection process to improve the irradiation hardness of LGAD sensors. The design and wafer testing results of IHEP-IMEv2 will also be discussed.
        Speaker: Mei Zhao (高能所, IHEP)
        Slides
      • 09:20
        Development of Radiation-hard LGAD at USTC 15m
        In this talk, the recent progress of the development of the Low-Gain Avalanche Detector (LGAD) at the USTC will be presented. The talk covers production and characterisation of the USTC LGADs . The LGADs, with its internal gain mechanism which can provide a signal with fast rising time, resulting in a time resolution of about 30 ps. The thin active layer reduces the Landau noise and makes it possible to fully deplete the detector after extremely high non-ionizing irradiation fluence (6E15 /cm^2 1 MeV-neq). The HGTD project in the ATLAS Phrase-II upgrade adopts the LGAD as the sensor technology and USTC is involved in the development and optimization of this technology. Several measures, including carbon diffusion and deep gain layer implantation, have been attempted and compared. Now the gain layer acceptor removal rate(c-factor) of USTC sensors is close to the most irradiation-hard sensors produced by the FBK, and is better than sensors from other vendors to date, proving the effectiveness of the strategy.
        Speaker: Xiao Yang (University of Science and Technology of China)
        Slides
      • 09:35
        AC-coupled LGAD and Large-area LGAD for electron-positron collider 15m
        The Low Gain Avalanche Diode (LGAD) is a high-precision time detection technology in high-energy experimental physics. There are two main two types LGAD for elector- positron collider: large-area LGAD (LA-LGAD) and AC-coupled LGAD (AC-LGAD). The large-area LGAD can greatly reduce the number of electronic readout channels and reduce experimental costs. AC-LGAD can reconstruct the particle position through the signal sharing of multiple AC-coupled readout pads. Both two LGADs are based on unsegmented multiplication PN junctions to avoid the fill factor losses. IHEP designs an AC-LGAD with 4 AC pads. Its time resolution and spatial resolution are studied by picosecond laser.
        Speaker: Mengzhao LI (高能所)
        Slides
      • 09:50
        PandaX-30T电子学系统预研 15m
        PandaX暗物质实验采用模数转换器来采集光电倍增管的波形信号。以前的PandaX-II实验采用了商用波形采样插件(100MS/s)。该采集卡可以全局外触发的方式采集一个完整的事例。但是在此触发模式下,暗物质探测灵敏度受到触发阈值的限制。因此正在运行的PandaX-4T实验采用另外一个型号的采样插件(250MS/s),通过单通道自触发的方式采集数据,避免了外触发阈值的不利影响。但是,受插件缓存大小的限制,不能采集一个完整的事例,不利于实验的取数。 李政道研究所暗物质和中微子平台包括了PandaX-30T暗物质实验的预研项目。该项目拟采用一种新型的光电管,其单光子信号宽度比PandaX-4T实验使用的光电倍增管的单光子信号更小。为此,我们研发了一款采样率500MS/s的8通道波形采集卡。该采集卡兼容自触发和外触发两种采数模式,可以一次缓存较长时间跨度的完整物理事例。另外,我们为该波形采集卡研发了相应的触发和时钟插件。利用PandaX-4T实验平台,我们搭建了60通道的波形采集系统,采集了刻度数据,验证了该系统的性能。本报告将报告PandaX-30T电子学系统预研进展及测试结果。
        Speaker: 昶达 何 (上海交通大学)
        Slides
      • 10:05
        Characterization of SOI pixel sensor using pinned depleted diode structure for CEPC vertex 15m
        The experiment on the next generation of electron-positron collider as a Higgs factory should have to reach the unprecedented impact parameter resolution, for the purpose of efficient tagging of heavy flavor quarks and τ lepton. This sets stringent demands on silicon pixel sensors of the vertex system, which is around 3μm single point resolution for the inner most detector layer, with fast readout, and very low power-consumption density and material budget. The silicon-on-insulator (SOI) technology, featuring as a monolithic silicon pixel process with fully depleted substrate, has potential to meet those requirements. Since 2017, a new generation sensor process called pinned depleted diode (PDD) has been developed, which has shown its features such as high charge collection efficiency, suppressing the leakage current at the Si-SiO2 interface, minimizing the junction capacitance and so on. In order to take advantages of PDD in our compact pixel detector series chips for vertex (CPV) and study their performances such as diode capacitances, equivalent input capacitance, and charge sharing and so on, three different PDD sensor structures with the same test circuit, which has been fabricated in the LAPIS 200nm SOI process, were developed to learn the characterization of the different sensor structures. The description of the prototype chip including PDD sensor diode, CPV3-PDD structures,pixel schematic and test setup will be presented, followed by the characterization results of the sensors. Finally the conclusions will be drawn and future plans will be outlined.
        Speakers: Dr Jing Dong (CAS-IHEP) , Dr Yunpeng LU (Institute of High Energy Physics, CAS)
        Slides
    • 10:30 10:40
      Coffee Break 10m
    • 10:40 12:00
      Parallel Session III:Heavy Ion Physics: EM Probes (Chair: 邵凤兰)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 10:40
        RHIC上电磁探针研究进展与实验计划 25m
        Speaker: Prof. 驰 杨 (Shandong University)
        Slides
      • 11:05
        The higher order effect in coherent photon production 25m
        Speaker: 王妹 查
        Slides
      • 11:30
        Low-$p_{T}$ $\mu^{+}\mu^{-}$ pair production in Au+Au collisions at $\sqrt{s_{_{\rm NN}}}$ = 200 GeV at STAR 15m
        Speaker: Jian Zhou
      • 11:45
        Heavy flavor quenching and flow from low to high transverse momenta 15m
        Speaker: Wen-Jing Xing
    • 10:40 12:15
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 10:40
        Towards precision calculations of partonic structure of hadrons 20m
        Calculating the partonic structure of hadrons from lattice QCD has attracted a lot of attention in the past few years. In this talk, I'll discuss some important steps towards precision calculations of the partonic structure of hadrons.
        Speaker: Jianhui Zhang (Beijing Normal University)
        Slides
      • 11:00
        Parton Distribution Functions Matching in Large Momentum Effective Theory 20m
        We present the next-to-next-to-leading order (NNLO) calculation of quark quasi-parton distribution functions (PDFs) in the large momentum effective theory. The nontrivial factorization at this order is established explicitly and the full analytic matching coefficients between the quasi-distribution and the light-cone distribution are derived. In addition, we will give an overview of the perturbative matching in the large momentum effective theory.
        Speaker: Dr Ruilin Zhu (Nanjing Normal University)
        Slides
      • 11:20
        Distribution Amplitudes of K∗ and φ from Lattice QCD 20m
        We present the first lattice QCD calculation of the distribution amplitudes of longitudinally and transversely polarized vector mesons K∗ and φ using large momentum effective theory. We use the clover fermion action on three ensembles with 2+1+1 flavors of highly improved staggered quarks (HISQ) action, generated by MILC collaboration, at physical pion mass and {0.06, 0.09, 0.12} fm lattice spacings, and choose three different hadron momenta Pz = {1.29,1.72,2.15} GeV. The resulting lattice matrix elements are nonperturbatively renormalized in a hybrid scheme proposed recently. Also an extrapolation to the continuum and infinite momentum limit is carried out. We find that while the longitudinal distribution amplitudes tend to be close to the asymptotic form, the transverse ones deviate rather significantly from the asymptotic form. Our final results provide crucial ab initio theory inputs for analyzing pertinent exclusive processes.
        Speaker: Dr Jun Hua (Shanghai Jiao Tong University)
        Slides
      • 11:40
        Lattice-QCD Calculations of Collins-Soper Kernel through TMD Wave Function 15m
        We’ll present the first lattice QCD calculation of transverse momentum dependence wave function of pion using large momentum effective theory. We use the clover fermion action on three ensembles with 2+1+1 flavors of highly improved staggered quarks (HISQ) action, generated by MILC collaboration, at pion mass 670MeV and 0.12 fm lattice spacing, choose three different hadron momenta Pz={1.72, 2.15, 2.58} GeV. Our target is to extract Collins-Soper kernel from quasi transverse momentum dependence wave function(quasi-TMDWF), which is computed on lattice calculation. For quasi-TMDWF, we use non perturbative renormalization in MSbar scheme by using Wilson-loop renormalization. We find the Collins-Soper is positive when transverse momentum is small. This is different from other groups results.
        Speaker: 旻寰 楚 (Shanghai Jiao Tong University)
        Slides
      • 11:55
        Lattice ensembles generation with Clover actions 15m
        I will talk about Lattice ensembles generation with Clover actions.
        Speaker: Prof. peng sun (NJNU)
        Slides
    • 10:40 12:00
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 10:40
        Fast Gravitational Wave Burst from Axion Clumps 20m
        The axion objects such as axion mini-clusters and axion clouds around spinning black holes induce parametric resonances of electromagnetic waves through the axion-photon interaction. In particular, it has been known that the resonances from the axion with the mass around mueV may explain the observed fast radio bursts (FRBs). Here we argue that similar bursts of high frequency gravitational waves, which we call the fast gravitational wave bursts (FGBs), are generated from axion clumps with the presence of gravitational Chern-Simons (CS) coupling. The typical frequency is half of the axion mass, which in general can range from kHz to GHz. We also discuss the secondary gravitational wave production associated with FRB, as well as the possible host objects of the axion clouds, such as primordial black holes. Future detections of FGBs together with the observed FRBs are expected to provide more evidence for the axion.
        Speaker: Dr Yun-Long Zhang (National Astronomical Observatories, Chinese Academy of Sciences(NAOC))
        Slides
      • 11:00
        电弱格点模拟相变引力波与原初磁场 20m
        我在报告中将与大家讨论电弱相变与新物理的关系,以及我们组在电弱相变产生引力波和原初磁场方面的研究进展。
        Speaker: Dr Ligong(立功) Bian(边) (Chongqing University(重庆大学))
      • 11:20
        Lorentz Violation of Cosmic Photons from Phenomenological and Theoretical Viewpoints 20m
        Cosmic photons from astrophysical sources are ideal for investigating the Lorentz symmetry violation (LV). A series of studies on high energy gamma-ray burst (GRB) photons suggest a light speed variation with linear energy dependence at the Lorentz violation scale of $3.6*10^{17}$ GeV, with subluminal propagation of high energy photons in cosmological space. I show that a string theory model for space-time foam provides an interpretation for this light speed variation. I also show that stringent constraints on Lorentz violation in the photon sector from complementary astrophysical observations can also be explained and understood in the space-time foam context.
        Speaker: Prof. Bo-Qiang Ma (Peking University)
      • 11:40
        Positivity bounds, UV states and SMEFT 20m
        Lorentz invariance, locality, unitarity and analyticity are some of the most fundamental properties of S-matrix/quantum field theory. I will explain why these fundamental principles can impose positivity bounds on the Wilson coefficients of the EFT, and how to obtain the strongest bounds in the forward limit and beyond. These positivity bounds are then used to constrain the parameter space of the Standard Model effective field theory (SMEFT).
        Speaker: Prof. Shuang-Yong Zhou (USTC)
    • 10:40 12:00
      Parallel Session I:TeV and BSM Physics: (Chair: Haijun Yang)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 10:40
        通过微分截面角分布研究HZZ 反常耦合 15m
        我们计算了包含反常耦合HZZ有效顶点的gg->H->ZZ->4l产生衰变过程的螺旋度振幅。在考虑了与box图干涉以及off-shell能区的贡献之后,我们给出了反应截面的微分角分布,找到了与HZZ反常耦合敏感的末态相空间角度定义,为LHC上进一步限制HZZ反常耦合参数空间提供参考。此外,利用振幅分解,我们还得到了计算HVV 到2e 2gamma或4l末态的BSM 过程振幅的一种简便方法。
        Speaker: Mr Youkai Wang (Shaanxi Normal University)
        Slides
      • 10:55
        Measurements of production cross sections of the Higgs boson in the four-lepton final state in proton–proton collisions at 13 TeV with the CMS detector 15m
        Production cross sections of the Higgs boson are measured in the H → ZZ → 4l (l = e, μ) decay channel. A data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS detector at the LHC and corresponding to an integrated luminosity of 137 fb−1 is used. See more details in EPJC 81 (2021) 488.
        Speaker: 倩颖 郭 (北京航空航天大学)
        Slides
      • 11:10
        Higgs coupling with bottom and top quarks: from discovery to measurement 15m
        Discovery of the Higgs boson in 2012 completed the Standard Model of particle physics. Measurement of this newly discovered Higgs boson properties examines the SM electroweak theory, and would also shed light for physics in beyond. Its coupling to the third generation quarks plays leading role not only because Higgs to bottom-quark pair having largest decay branching ratio, but also Higgs-top Yukawa coupling being the largest one among all fermions. Direct evidences of Higgs coupling to bottom and top quarks were observed in 2018. After which, the couplings as well as production and decay cross sections have been measured in discovery channels with full Run 2 luminosity. This talk will present recent updates from ATLAS experiment.
        Speaker: Kun LIU (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
        Slides
      • 11:25
        Higgs decays to dimuon and di-charm with the ATLAS detector 15m
        In July 2012, the ATLAS and CMS Collaborations announced the discovery of a new particle with a mass of approximately 125 GeV at the CERN Large Hadron Collider (LHC). Subsequent measurements have indicated that this particle is consistent with the Standard Model (SM) Higgs boson. The ATLAS Collaboration has carried out a search for the Higgs to dimuon process with the data collected during Run 2 of the LHC. This talk is going to present the latest results of Higgs to dimuon search from the ATLAS experiment.
        Speaker: Prof. Haifeng Li (Shandong University)
        Slides
      • 11:40
        Observation of tW in lepton + jets channel and Study of ttH in multilepton channel with the CMS detector 15m
        A measurement of the associated production of a single top quark and a W boson in the final states with an electron or muon and jets using pp collisions with s√=13 TeV collected by the CMS detector at the CERN LHC is presented. The data used correspond to an integrated luminosity of 35.9 fb−1. This result is the first observation of the tW process in the final states containing a muon or electron and jets, with an observed significance clearly exceeding 5 standard deviations. The measured signal strength is μ=1.24±0.18, consistent with unity. The inclusive cross section is determined to be 89±4 (stat) ± 12 (syst) pb. See more details in CMS-PAS-TOP-20-002 and EPJC 81 (2021) 378.
        Speaker: Prof. Huaqiao ZHANG (IHEP)
        Slides
    • 10:40 12:00
      Parallel Session V:Particle Detector Technology
      Convener: Mr chengguang zhu (Shandong Univ)
      • 10:40
        CMOS像素芯片JadePix3的性能测试 20m
        CMOS像素芯片JadePix3是在CEPC预研项目框架下研发的高空间分辨率、低功耗的全功能像素探测器芯片。为了满足顶点探测器对b/c夸克和tau轻子进行flavor tagging的实验要求,该芯片以小像素为核心目标进行了设计优化,其最小像素尺寸为16 um*23 um,仅为国外同类芯片的像素面积的一半大小。如此小的像素尺寸,是通过对底层器件最小化来实现的,包括Sensing Diode,MOS电容,控制逻辑。同时,版图设计也推向了工艺允许的极限。这些设计上的选择能否确保芯片正常工作并取得预期的空间分辨率,需要通过实验测试来验证。 JadePix3芯片在设计上的独特之处还体现在采用了弱电流脉冲放大/甄别器和逐行扫描(Rolling Shutter)相结合的信号读出架构。前者的优点是电流脉冲放大,不需要外部控制,增益高面积小;后者的好处是电路简单,可以缩小约1/4的像素面积。但是逐行扫描的帧时间接近100 us,高增益的放大/甄别器的噪声过阈会在两帧之间累积。为了防止出现噪声击中过多的情况,额外增加了一个全局快门(Global Shutter)的控制功能。如果噪声击中过多,可以利用全局快门选择时间窗口,即在外部触发控制下工作;如果噪声击中较少,则全局快门常开,正常逐行扫描连续工作。Rolling Shutter和Global Shutter两种工作模式下的噪声测试和对比,是理解和选择像素阵列读出架构的关键依据。 JadePix3芯片的性能测试主要利用电子学脉冲刻度作为主要手段,全面研究了不同的像素设计在噪声,阈值一致性和噪声计数率等方面的差别,并进一步利用红外激光研究了单像素的一维位置残差分布,从而给出空间分辨率的初步评估结果。激光测试的结果显示像素短边(16um)方向的空间分辨最好可达到2.7um,长边(23um)方向的空间分辨最好可达到3.4um。实测得到的噪声计数率为10e-6 /frame/pixel,可以确保在Rolling Shutter连续工作模式下足够低的噪声水平,为无触发的实验设想提供了技术实现的基础. 该芯片的设计功耗密度为78 mW/cm2,实测平均功耗密度为91.44mW/cm2,其中数据缓存和数据传输模块的功耗可在今后的设计中进一步优化和压缩,最终目标是达到50 mW/cm2。
        Speaker: Dr Yunpeng LU (Institute of High Energy Physics, CAS)
        Slides
      • 11:00
        HERD 量能器研究进展 15m
        中国空间站高能宇宙辐射探测设施(HERD)项目是由我国科学家提出应用于我国未来空间站的大型科学研究项目,其物理目标包括暗物质寻找、宇宙线探测以及高低能伽玛射线研究。HERD探测器从内而外分为三维成像量能器CALO、光纤径迹仪FIT、塑闪探测器PSD、硅电荷探测器SCD和穿越辐射探测器TRD。三维成像量能器CALO是HERD的核心探测器,测量粒子能量并进行粒子鉴别,五面灵敏的创新设计确保了超大几何因子。它由7500块LYSO晶体组装成21层栅格模块。每块晶体的信号由4根波长转移光纤送至高、低量程增强相机和触发系统。量能器还配置了PD信号读出系统,实现能量信息的双测量。触发系统收集CALO和PSD的快信号完成有效触发。三维成像量能器是HERD的核心载荷,具备大几何因子,具有高分辨能量测量能力和高粒子鉴别能力。立足成为下一代的高能宇宙辐射探测设施,HERD创新性的选择了五面灵敏,具有三维成像能力的量能器,有效接收度比以往同类项目高一个数量级以上。三维量能器等效55个总辐射长度和3个核作用长度,每块晶体颗粒度仅为3厘米,保证了极高的能量重建能力和粒子鉴别能力。空间高能粒子在量能器中发生电磁簇射或强子簇射,通过收集每块晶体的信号可重建入射粒子的三维簇射轮廓和能量信息。HERD量能器经过CERN高能束流测试验证了方案可行性以及核心参数指标。
        Speaker: Dr 志刚 王 (IHEP)
        Slides
      • 11:15
        SOI-3D技术在顶点探测器中的应用 15m
        建造下一代正负电子对撞机,对希格斯物理进行精密测量,以检验粒子物理标准模型并发现新物理是当前国际粒子物理学界的共识。而未来高亮度、高精度的正负电子对撞机实验,对用于高效鉴别重味夸克和Tau轻子、以及精确测量带电粒子动量的顶点探测器系统,在空间分辨、时间分辨、功耗、抗辐照能力等方面,提出了极高的综合性能要求。其中,高空间分辨要求的小像素尺寸和高时间分辨所需的像素内复杂的电子学功能,在实现上的矛盾,成为当前像素探测器研发的主要难点。 不同于当前主流的单片集成(Monolithic)探测器技术,我们提出了一种新的设计方案,将像素探测器芯片的模拟部分和数字部分分别设计流片,再通过TBV(Through Box Via)技术进行3D连接,从而在不增大像素尺寸的条件下,实现了复杂像素内数字逻辑功能的集成。
        Speaker: Dr Yang ZHOU (Institute of High Energy Physics, CAS)
        Slides
      • 11:30
        用于CEPC内层顶点探测器的高计数率CMOS像素探测器芯片研制 15m
        高能环形正负电子对撞机(Circular Electron Positron Collider, CEPC)内层顶点探测器,对于重味夸克重建与分辨至关重要。为实现高精度的物理测量,对内层顶点探测器的物质量、空间分辨率、读出速度以及功耗等方面的性能提出了极严苛的要求。CMOS像素探测器(CMOS Pixel Sensor, CPS)技术在上述各性能方面具有很大的优势,是很有前景的候选探测器技术之一。自2015年起,CEPC顶点探测器研发团队开展了一系列的CMOS像素探测器芯片研发工作。 根据最新的对撞机设计方案和电子束本底的研究结果,顶点探测器内层的最高击中率预计高达 ~10^7/cm^2/s。为满足 CEPC 顶点探测器的最高击中率需求,研发团队开展一款名为TaichuPix的CMOS 像素探测器芯片的研发。采用180 nm CMOS 工艺,目前已经完成了两个小规模原型芯片(25 mm^2) 的设计和验证,均能够满足高达 36 MHz/cm^2 的击中率需求。本报告将介绍像素内读出电路的设计改进,以实现 25 μm 的像素间距和 40 MHz 的快速读出频率。像素阵列的读出基于一种改进型的“列级数据传输链”的读出结构,并设计了两种不同的像素数字读出电路作为对比方案。像素按照每两列一组排列,所有双列并行读出,以尽量减少死时间。列内有优先级编码器,在列末端有时间计数器以记录信号击中像素的时间戳。当其中一个像素检测到击中时,列末端电路以 25 ns的时间分辨率存储当前时间戳。在触发模式下,击中的时间戳(时间窗口为 175 ns)与触发信号匹配的数据被存至芯片级存储器。数据可通过高速串行数据接口输出至芯片外。本报告将介绍两个 TaichuPix 原型芯片的电学和放射源,以及电离辐射前后芯片功能和噪声、阈值性能的测试结果。
        Speaker: Ying Zhang (IHEP)
        Slides
      • 11:45
        HEPS-BPIX2: the Hybrid Pixel Detector with TSV Processing for High Energy Photon Source 15m
        HEPS-BPIX2 is the second prototype of single-photon counting pixel detector with 1.4 million pixels developed for applications of synchrotron light sources. It follows the first prototype, HEPS-BPIX, with a pixel size of 150 µm x 150 µm and frame rate up to 1.2 kHz at 20-bit dynamic range. This paper contains a detailed description of HEPS-BPIX2 upgrade with a recently launched Through Silicon Via (TSV) processing to reduce the insensitive gap between modules. From the 60k-pixel single-module detector to large-area multi-modules systems, the transmission control protocol (TCP) hardware stack on 10 Gigabit Ethernet (10GbE) is adopted for high speed data transfer to DAQ. The calibration and images are taken at X-ray and synchrotron light, and the performance is also presented.
        Speakers: Dr Jie ZHANG (Institute of High Energy Physics) , Mr Wei WEI (高能所)
        Slides
    • 12:00 14:00
      Lunch 2h
    • 14:00 15:35
      Parallel Session III:Heavy Ion Physics: Chirality and Others (Chair: 候德富)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 14:00
        Axial kinetic equations for QED from Kadanoff-Baym equation 25m
        Speaker: Shu Lin (Sun Yat-Sen University)
        Slides
      • 14:25
        手征反常效应的实验测量进展 25m
        Speaker: Qiye Shou (Fudan University)
      • 14:50
        Second-order charge currents and stress tensorin a chiral system 15m
        Speaker: Shi-Zheng Yang
        Slides
      • 15:05
        X(3872) production in heavy-ion collisions 15m
        Speaker: Baoyi Chen (Tianjin University)
        Slides
      • 15:20
        sPHENIX: The next generation heavy ion experiment at RHIC 15m
        Speaker: Prof. Hideki Okawa (Fudan University)
        Slides
    • 14:00 15:40
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 14:00
        Theory of Exclusive B-meson Decays 20m
        I will discuss the recent theory development on exclusive B-meson decays.
        Speaker: Prof. Yuming Wang (Nankai University)
      • 14:20
        Inclusive search for \Xi_{bc} 20m
        We propose to search for the doubly-heavy baryon $\Xi_{bc}$ via the inclusive $\Xi_{bc} \to \Xi_{cc} + X$ decay with a displaced vertex. We calculate its decay width and find it at the order of $10^{-13}$ GeV. We also estimate that hundreds of signal events are expected to be observed at the LHCb RUN3.
        Speaker: Dr Qin Qin (华中科技大学(HUST))
        Slides
      • 14:40
        Test of quantum nonlocality with branching ratios of $K_SK_S$ in vector meson decays 20m
        In the quantum-entangled neutral kaons system, the two kaons can be described as wave functions. When one kaon collapses into the $K_S$ state, the other one collapses instantaneously into the $K_L$ state, showing the relation between entanglement and nonlocality. In this work, in order to test the instantaneous effect, we introduce the locality hypothesis assuming that decay information travels at the speed of light. Since there's a time window during which one kaon has no idea the other has decayed, some $K_SK_S$ decays may happen which are forbidden by quantum mechanics. We calculate the branching ratios of $K_SK_S$ in vector meson decays under locality hypothesis and compare them with experimental results. Taking $J/\psi$ as an example, the branching ratio of $J/\psi\rightarrow K_SK_S$ is $(5.5\pm0.9)\times10^{-6}$ under locality assumption, which is excluded by the BESIII experimental upper limit in 2017: $Br(J/\psi\rightarrow K_SK_S)<1.4\times10^{-8}$. More experimental results are expected to perform this test in the future.
        Speaker: Peicheng Jiang (Peking Uniersity)
        Slides
      • 15:00
        Light-front approach to nucleon structure 20m
        The light front is a three-dimensional hypersurface tangential to the light cone. The field theory quantized on the light front provides unique advantages in describing the structure of relativistic bound states. In this work we solve the structure of the nucleon in a nonperturbative approach based on the Hamiltonian formalism of the light-front field theory. The input Hamiltonian includes an effective confining interaction and a one-gluon exchange interaction between the three valence quarks. The resulting three-body light-front wave functions are subsequently employed to calculate the observables characterizing the nucleon's three-dimensional structure: the form factors, the parton distribution functions, the generalized parton distribution functions and the transverse-momentum-dependent distributions. Finally I will report our recent progress in the calculation including one dynamical gluon. I will show the preliminary results on the gluon distribution in the nucleon.
        Speaker: Xingbo Zhao (Institute of Modern Physics, Chinese Academy of Sciences)
        Slides
      • 15:20
        Hadronic decays of charmed hadrons at BESIII 20m
        BESIII has collected 2.9, 6.3 and 4.4 fb-1 of e+e- collision data samples at 3.773, 4.178-4.226 and 4.6-4.7 GeV, respectively. We report recent measurements of strong phase differences in D0 and D0-bar decays of KSpi+pi-, KSK+K-, K-pi+pi+pi- and K-pi+pi0. The obtained parameters are important to reduce the systematic uncertainty in the gamma/phi_3 measurement at LHCb and Belle II. Also, we will report the first observations of some new hadronic decay modes and the absolute branching fractions measurements. Moreover, the amplitude analysis results of Ds -> K+K-pi+, pi+pi+pi-, KSpi+pi0, K+K-pi+pi0, etapi+pi+pi-, and D+ -> KSK+pi0 will be presented. In addition, recent results on Lambda_c decays will be presented.
        Speaker: Lei Li (Beijing Institute of Petro-chemical Technology)
        Slides
    • 14:00 15:30
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 14:00
        Explicit Perturbations to the Stabilizer $\tau = {\rm i}$ of Modular $A^\prime_5$ Symmetry and Leptonic CP Violation 15m
        The finite modular symmetry provides us with an attractive and novel way to understand lepton flavor mixing, and has recently attracted a lot of attention. In a class of neutrino mass models with modular flavor symmetries, it has been observed that CP symmetry is preserved at the stabilizer of the modulus parameter $\tau = {\rm i}$, whereas significant CP violation emerges within the neighbourhood of this stabilizer. In this work, we first construct a viable model with the modular $A^\prime_5$ symmetry, and explore the phenomenological implications for lepton masses and flavor mixing. Then, we introduce explicit perturbations to the stabilizer at $\tau = {\rm i}$, and present both numerical and analytical results to understand why a small deviation from the stabilizer leads to large CP violation. As low-energy observables are very sensitive to the perturbations to model parameters, we further demonstrate that the renormalization-group running effects play an important role in confronting theoretical predictions at the high-energy scale with experimental measurements at the low-energy scale.
        Speaker: Mr Xin WANG (中科院高能物理研究所)
        Slides
      • 14:15
        Inverse Seesaw Model with a Modular S4 Symmetry: Lepton Flavor Mixing and Warm Dark Matter 15m
        In this work, we present a systematic investigation on simple inverse seesaw models for neutrino masses and flavor mixing based on the modular $S^{}_4$ symmetry. Two right-handed neutrinos and three extra fermion singlets are introduced to account for light neutrino masses through the inverse seesaw mechanism and to provide a keV-mass sterile neutrino as the candidate for warm dark matter in our Universe. Considering all possible modular forms with weights no larger than four, we obtain twelve models, among which we find one is in excellent agreement with the observed lepton mass spectra and flavor mixing. Moreover, we explore the allowed range of the sterile neutrino mass and mixing angles, by taking into account the direct search of $X$-ray line and the Lyman-$\alpha$ observations. The model predictions for neutrino mixing parameters and the dark matter abundance will be readily testable in future neutrino oscillation experiments and cosmological observations.
        Speaker: Dr 忻怿 张 (中国科学院高能物理研究所)
        Slides
      • 14:30
        中微子跷跷板模型的简化结构 15m
        中微子振荡现象表明中微子具有非零的质量并发生了混合。如何理解中微子的微小质量以及混合模式是粒子物理理论研究的一个重要问题。跷跷板机制是最为广泛接受的产生中微子质量的方法,其不仅能够自然地解释中微子质量的微小,而且为宇宙的正-反物质不对称提供了一个非常具有吸引力的解释—轻子生成机制。 然而,一般性的、包含三个右手中微子的跷跷板模型由于参数太多,无论对中微子质量还是轻子生成的解释都只是定性的,缺乏定量预言的能力。为了提高跷跷板模型的预言能力,文献中有两种典型的减少其参数的做法:一是把右手中微子的数量减少至两个(称为最小跷跷板模型);二是利用味道对称性(如mu-tau对称性)限制其味结构。 本报告将介绍跷跷板模型简化结构(最小跷跷板模型及味道对称性)及相关的轻子生成的一些研究现状。
        Speaker: 振华 赵 (辽宁师范大学)
      • 14:45
        The scattering of Majorana fermion by torsion field 15m
        We investigate the scattering of neutrino by torsion field and find the different scattering responses between the Dirac type and Majorana type. The difference may be an possible way to determine the fermion type of neutrino by the propagation of neutrino in the universe. We also investigate the propagation of spin 1/2 particle in the torsion field.
        Speaker: Prof. Xun Xue (East China Normal University)
      • 15:00
        Breaking Peccei-Quinn Symmetry at Low Scales 15m
        We propose an efficient mechanism to realize an invisible axion from a low scale Peccei-Quinn symmetry breaking. Our basic model only contains a gauge boson, an up-type vector-like quark, two Higgs doublets and two Higgs singlets besides the standard model fermions and gauge bosons. The physical Peccei-Quinn global symmetry is a result of two independent global symmetries connected by the new gauge symmetry. Anyone of these two global symmetries only acts on either the right-handed top quark or the left-handed new quark so that it can avoid the domain wall problem. Thanks to the electroweak and new gauge interactions, the Higgs doublet for the top quark mass generation and the Higgs singlet for the new quark mass generation can only contribute a tiny fraction in the axion. The axion decay constant can be largely enhanced by a factor composed of the vacuum expectation values of the four Higgs scalars. Our mechanism provides a new opportunity to fully test the Peccei-Quinn symmetry at colliders.
        Speaker: Dr Peihong Gu (Southeast University)
      • 15:15
        Radiative neutrino masses, lepton flavor mixing and muon g − 2 in a leptoquark model 15m
        We propose a leptoquark model with two scalar leptoquarks $S_1 ( {\bar{3}},1,\frac{1}{3} )$ and ${\widetilde R_2}(3,2,\frac{1}{6})$ to give a combined explanation of neutrino masses, lepton flavor mixing and the anomaly of muon $g-2$, satisfying the constraints from the radiative decays of charged leptons. The neutrino masses are generated via one-loop corrections resulting from a mixing between $S_1$ and ${\widetilde R_2}$. With a set of specific textures for the leptoquark Yukawa coupling matrices, the neutrino mass matrix possesses an approximate $\mu$-$\tau$ reflection symmetry with $( M_\nu )_{ee} = 0$ only in favor of the normal neutrino mass ordering. We show that this model can successfully explain the anomaly of muon $g-2$ and current experimental neutrino oscillation data under the constraints from the radiative decays of charged leptons.
        Speaker: Mr Zhang Di (IHEP, CAS)
        Slides
    • 14:00 15:35
      Parallel Session I:TeV and BSM Physics: (Chair: Qiang Li)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 14:00
        Observation of EW vector boson scattering processes with the ATLAS detector 15m
        In the Standard Model of particle physics, elementary particles acquire their masses by interacting with the Higgs field. This process is governed by a delicate mechanism: electroweak symmetry breaking (EWSB). Although EWSB was first proposed in 1964, it remains among the least understood phenomena of the Standard Model as a large dataset of high-energy particle collisions is required to probe it. ATLAS has recently observed the electroweak production of two jets in association with a Z-boson pair using the full Run 2 data collected during year 2015 to 2018, which marks the new milestone in the study of EWSB. A detailed review of this analysis will be presented, and further scrutiny of EWSB will continue in other channels as well as with future datasets at the LHC
        Speaker: 冰 李 (山东大学)
        Slides
      • 14:15
        Observations and measurements of Z and photons’ scattering and interactions with the CMS detector 15m
        The first observation of the electroweak (EW) production of a Z boson, a photon, and two forward jets (Zγjj) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. A data set corresponding to an integrated luminosity of 137 fb−1, collected by the CMS experiment at the LHC in 2016-2018 is used. The measured fiducial cross section for EW Zγjj is 5.21±0.52(stat) ±0.56 (syst) fb = 5.21±0.76 fb. Single-differential cross sections in photon, leading lepton, and leading jet transverse momenta, and double-differential cross sections in mjj and |Δηjj| are also measured. Exclusion limits on anomalous quartic gauge couplings are derived at 95% confidence level in terms of the effective field theory operators. See more details in arXiv:2106.11082
        Speaker: Ying An (Peking University)
        Slides
      • 14:30
        Drell-Yan rapidity distribution at N3LO 15m
        I will report the first results on di-lepton rapidity distribution in Drell-Yan virtual photon production to Next-to-Next-to-Next-to-Leading Order (N3LO) in QCD. For inclusive cross section, we find excellent agreement with a previous analytic calculation. Our results show large QCD corrections at N3LO compared with NNLO over all rapidity region.
        Speaker: Dr HuaXing Zhu (Zhejiang University)
        Slides
      • 14:45
        Inclusive and VBS W+photon with the CMS detector 15m
        A fiducial cross section for inclusive and VBS Wγ production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in data collected using the CMS detector at the LHC. In addition, 95% confidence level intervals are reported for anomalous triple and quartic-gauge couplings within the framework of effective field theory. See more details in Phys. Rev. Lett. 126, 252002 (2021) and Phys. Lett. B 811 (2020) 135988
        Speaker: meng lu (Peking University)
        Slides
      • 15:00
        Master integrals for the mixed QCD-QED corrections to the Drell-Yan process with lepton mass dependence 15m
        The Drell-Yan(DY) processes are one of the cutting-edge topics in physics at the LHC. In order to include the logarithmic contributions of lepton mass in the mixed QCD-QED corrections to the charged-current DY process, the requisite two-loop master integrals must be calculated with a massive lepton. These integrals are computed analytically by using the differential equation method. A suitable choice of master integrals makes it successful to cast the differential equation system into the canonical form. The lepton mass is kept in the building of differential equations and then the system is expanded against the ratio of small lepton mass to large vector boson mass. All the master integrals are present in the form of a Taylor series around four space-time dimensions with the coefficients being expressed by Goncharov polylogarithms up to weight 4.
        Speaker: Mr Mingming Long (USTC)
        Slides
      • 15:15
        High precision boson-jet correlation at the LHC 15m
        The azimuthal decorrelation in vector boson+jet production due to soft and collinear QCD effects can be calculated to high precision by using recoil-free jet axes, such as the Winner-Takes-All (WTA) axis, alongside Soft-Collinear Effective Theory (SCET) methods. I present theoretical predictions at next-to-next-to-leading logarithmic accuracy for the azimuthal decorrelation, and demonstrate that this result is robust when using charged tracks instead of calorimetry, and in the presence of large backgrounds, due to the features of the WTA axis. We further find contributions to the process from linearly-polarised gluon transverse momentum distributions (arising from spin superposition effects of a single incoming or outgoing parton), in both the initial and final state.
        Speaker: Prof. 鼎煜 邵 (复旦大学)
        Slides
    • 14:00 15:35
      Parallel Session V:Particle Detector Technology
      Convener: Prof. Qun OUYANG (IHEP)
      • 14:00
        NICA/MPD实验新型电磁量能器器研制及生产 20m
        “NICA/MPD实验新型电磁量能器关键技术合作研究”是中俄基于NICA加速器合作的重大项目,NICA是一台位于俄罗斯杜布纳联合核子研究所(JINR)正在设计建造中的重离子对撞加速器装置。 NICA/MPD的主要物理目标是产生并研究高重子密度下的一种新物质态以及寻找奇特粒子,包括强子态-夸克胶子等离子体相变、核物质相变临界点、夸克胶子强相互作用、强子化机制、以及宇宙大爆炸的初始状态和演变过程等。中方将在两年时间内为MPD实验研制出由8个扇区组成的电磁量能器样机。本文介绍了应用于MPD实验的Shashlyk型电磁量能器的组成结构,原型研发,束流实验结果,批量生产工艺流程及批量生产情况。
        Speaker: Prof. Yi Wang (THU)
        Slides
      • 14:20
        A novel concept of 4D crystal calorimetry for future lepton colliders: R&D highlights 15m
        For future lepton collider experiments, a novel concept of 4D calorimetry based on scintillating crystals has been proposed to overcome performance limits of the existing highly-granularity calorimetry options and aims to achieve excellent resolutions of energy, 3D positioning and timing with the homogeneous structure. The ongoing studies on the detector design and optimisation have been guided by the Geant4 full simulation as well as performance studies with selected physics benchmarks. Hardware development of the detector units is focused on the characterizations with scintillating crystals, the readout with silicon photomulpliers (SiPMs) as well as low-power front-end electronics. This talk will present highlights of the physics performance studies with the crystal calorimeter as part of the CEPC detector and progress on the crystal-SiPM studies.
        Speakers: Dr Sheng-Sen Sun (Institute of High Energy Physics) , Dr Yong Liu (Institute of High Energy Physics)
        Slides
      • 14:35
        Development of the CMS-HGCAL silicon module center in Beijing 15m
        This talk will present current status of the CMS Phase-2 endcap calorimeter upgrade (HGCAL) project, with a major focus on the R&D activities of the CMS-HGCAL team in China working on the silicon modules. A dedicated silicon detector lab on IHEP campus in Beijing has successfully been developed and will serve as one of six MACs around the world. The lab is now being commissioned for the silicon module assembly with essential quality control procedures. Several test stands have been developed to evaluate the module performance. Besides a general overview of the HGCAL project, future plans and prospects of the silicon modules will also be briefly covered.
        Speaker: Prof. Huaqiao ZHANG (IHEP)
        Slides
      • 14:50
        On-orbit performance of the DAMPE BGO calorimeter 15m
        The DArk Matter Particle Explorer (DAMPE) is the first Chinese cosmic-ray direct detection experiment. It has been operating smoothly on-orbit since its successful launch at the end of 2015. Currently, its sub-detectors and the satellite are in good working order. The DAMPE payload employs a BGO Calorimeter for energy measurements, trigger and e/p identification. The calorimeter is constructed of 308 BGO crystals, and PMTs are coupled to the crystals with optical filters to readout scintillation light. In this work, we will present the status and performance of the calorimeter, including orbit calibration, energy measurement, especially in TeV range, detector endurance, and long term performance in a duration of 5.5 years.
        Speaker: Dr Yifeng Wei (USTC)
        Slides
      • 15:05
        R&D activities of highly granular hadron calorimeters for the CEPC 15m
        Based on the particle-flow algorithm, highly granular sampling hadron calorimetry (HCAL) with scintillator tiles or micro-pattern gas detectors (MPGDs) as active layers and stainless steel as absorber is proposed to achieve an unprecedented jet energy resolution to address major challenges of precision measurements at future lepton colliders, including the Circular Electron Positron Collider (CEPC). A wide range of R&D activities are ongoing, including the construction of a HCAL prototype with 40 layers, the development of large-scale Resistive Plate Chambers (RPCs) and potentials of an excellent timing resolution on the order of 10 pico-second. This talk will present the latest progress of the prototype development, with highlights from optimization studies of the HCAL design based on the evolving Particle Flow Algorithm "Arbor", characterisations of silicon photomulpiliers (SiPMs) from different vendors, mass production of scintillator tiles, automated foil wrapping, as well as dedicated test stands for the quality control of scintillator tiles and SiPMs. Highlighted progress of RPC-based layers and dedicated electronics for fast timing will also be presented.
        Speaker: 禹坤 石 (中国科学技术大学)
      • 15:20
        Design and performance studies of the electromagnetic calorimeter for STCF 15m
        The Super Tau-Charm Facility (STCF), a new generation electron-positron collider in China, is proposed as a unique platform to study tau-charm physics. The baseline design of the electromagnetic calorimeter (ECAL) is based on pure CsI crystals with avalanche photodiodes readout. A geometric model design for ECAL consists of 8670 pure CsI crystals with defocus operation will be presented. Based on GEANT4, the performance of ECAL is simulated in detail. We will present a summary of the results of the performance simulation, as well as introduce the software framework and reconstruction algorithm. The peaking luminosity of STCF is beyond 0.5×〖10〗^35 〖cm〗^(-2)∙s^(-1) at √s=4GeV, and the background counting rate reaches an exceedingly magnitude of MHz. We will present the estimation of performance deterioration caused by background and a multi-pulse fit algorithm is developed to deal with the effect.
        Speaker: Yong Song (USTC)
        Slides
    • 14:00 15:30
      Poster Session
      • 14:00
        Hadronic Effects on Charmoium Elliptic Flows in Heavy-Ion Collisions 2m
        Transport and Langevin equations are employed to study hadronic medium effects on charmonium elliptic flows in heavy-ion collisions. In Pb-Pb collisions, the anisotropic energy density of the quark-gluon plasma (QGP) in the transverse plane is transformed into hadron momentum anisotropy after the phase transition. Charmonia with high transverse momentum p T are produced via the primordial hard process and undergo different degrees of dissociation along different paths in the QGP. They then scatter with light hadrons in the hadron phase. Both contributions to the charmonium elliptic flows are studied at moderate and high transverse momenta. The elliptic flows of the prompt J/ψ are found to be considerably enhanced at high transverse momentum when the charmonium diffusion coefficients in the hadronic medium are parametrized through the geometry scale approximation. This hadronic medium effect is negligible for quarkonia with larger mass such as bottomonia.
        Speakers: Baoyi Chen (Tianjin University) , Mrs liu jiang (Tianjin University)
        Poster
      • 14:04
        Development of the readout system for CEPC AHCAL prototype 2m
        As a vital component of the calorimetry of the Circular Electron Positron Collider (CEPC), the analog hadron calorimeter (AHCAL) uses scintillator, silicon photomultiplier (SiPM) and steel as medium to detect the hadrons. Its 70mm × 70mm × 40layer prototype is under construction. The readout system of AHCAL is designed to achieve high accuracy of the energy measurement, providing large channel number and dynamic range. An applied special integrated circuit (ASIC) named SPIROC is applied in the readout system for high integrity and low power consumption. Moreover, the readout system is easily scalable for different sizes of sensitive area.
        Speaker: Mr Hao Liu (USTC)
        Slides
      • 14:06
        The charged hadron production with collinearly-improved unintegrated gluon distribution in heavy-ion collisions 2m
        Based on the framework of Color Glass Condensate (CGC), we study the hadron production with collinearly-improved unintegrated gluon distribution which is obtained by numerical solving the collinearly-improved next-to-leading Balitsky-Kovchegov equation. We calculate the multiplicity and transverse momentum distributions of the charged hadron in p+p and p+A collisions at RHIC and LHC energies. We find that the predictive power of the CGC hadron production model is significantly improved once the collinear corrections are taken into account.
        Speaker: Mr 文铎 赵 (贵州大学)
      • 14:08
        The performance of IHEP-NDL and IHEP-IME LGAD sensors after neutron Irradiation 2m
        The Institute of High Energy Physics of Chinese Academy of Sciences (IHEP, CAS) has designed two types of LGAD sensors, which are produced in the Novel Device Laboratory (NDL) and Institute of Microelectronics (IME) respectively. The sensors of the two foundries were irradiated with the neutron fluences of 0.8e15, 1.5e15 and 2.5e15 neq/cm2 in Institut Jozef Stefan (JSI). The timing resolution and collected charge of the LGAD sensors were measured with electrons from a beta source. After irradiation with a fluence of 2.5e15 neq/cm2, the collected charge of the IHEP-NDL (IHEP-IME) sensor can be greater than 7 (11) fC, and the timing resolution is better than 40 (50) ps.
        Speaker: Yunyun Fan (高能所)
      • 14:12
        Measurement of proton-Ξ correlation function in Au+Au Collisions at √s_NN = 200 GeV by STAR experiment at RHIC 2m
        The study of baryon-baryon interactions is important to understand existence of strangelets and various exotic hadrons, and for modeling of astronomical objects such as neutron stars. A detailed knowledge of nucleon-nucleon (NN) potentials exists in literature, however very little is known about interactions between anti-nucleons. Similarly lack of scattering data for hyperon-nucleon (YN) systems makes it difficult to construct YN potentials. In heavy-ion collisions, a large number of baryons are produced in each nucleus-nucleus collision, which allows us to study the NN and YN interactions. Measurements of two-particle correlation function are used to study the space-time dynamics of the source created in heavy-ion collisions. At low relative momentum, the two-particle correlations are effected by the Final State Interactions (FSI), making it possible to measure FSI between nucleon and multi-strange baryon Ξ. The first measurement of proton-Ξ correlation function from the STAR experiment at RHIC for the Au+Au collisions at √s_NN = 200 GeV will be presented.
        Speaker: 柯 米 (Central China Normal University)
        Slides
      • 14:22
        The event data visualization tool for PandaX-4T experiment. 2m
        Large scale of data will be produced in the PandaX-4T experiment. A fast I/O library is created to speed up the data processing, which converts the recorded waveforms from the PMTs into reconstructed events, with signals identified. Convenient event data visualization is required during the data analysis. We developed the PandaX-4T Event Viewer for this purpose. The tool is running on the client-server mode. The server side is developed with C++, which will read the data file and send required information to the client via the HTTP protocol. The client is developed with the ReactJS and Electron toolset and will be running on the user’s own computer, with supports to multiple type of operating system. The waveform and hit patterns of selected events can be viewed in the client. It helps to the data selection in the PandaX-4T experiment.
        Speaker: Mr Abdusalam Abdukerim (Shanghai Jiao Tong University)
        Poster
      • 14:24
        Measurement of Intermittency for Charged Particles in Au + Au Collisions at $\sqrt{s_{NN}}=7.7-200$ GeV from STAR 2m
        One of the main goals of RHIC beam energy scan (BES) program is to search for the signatures of QCD critical point in heavy-ion collisions. It is predicted that the local density fluctuations near the critical point exhibit power-law scaling, which can be probed with an intermittency analysis of the scaled factorial moments, $F_{q}(M)$, for charged particles. The power-law behavior of $q^{th}$ order scaled factorial moments can be expressed as: $F_{q}(M)\sim F_{2}(M)^{\beta_{q}}$, where $M$ is the number of equally sized cells in one dimension of momentum space, and $\beta_{q}$ is the intermittency exponent. The scaling exponent, $\nu$, related to the critical component can be derived from the equation: $\beta_{q}\sim (q-1)^{\nu}$. The energy dependence of $\nu$ could be used to search for the signature of the QCD critical point. Similar measurements have been carried out by NA49 and NA61 experiments in heavy-ion collisions with different system sizes. In this talk, we will present the scaled factorial moments ($F_{q}(M)$, up to sixth order) of charged particles in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 200 GeV measured by STAR experiment in the first phase of RHIC BES. Then, we will show the energy and centrality dependence of the extracted $\nu$ values. The physical implications of these results will be discussed.
        Speaker: Mr Jin Wu (CCNU)
        Slides
      • 14:26
        Collectivity arising from interference in small and large systems with HBT suppressions 2m
        The physical origins of the collective phenomena observed from small to large systems is an important subject in relativistic heavy-ion physics. Collectivities can be established in two different ways in coherent and incoherent modes of particle emissions, respectively. Possible indications of the coherence in particle emission have been observed in Hanbury-Brown-Twiss (HBT) correlations (the suppressed strength). However, the role played by the possible coherence in the collectivity is less focused on. In this work, we study the collectivities in AA and pp collisions in a partially coherent particle(pion)-emitting source model, including an expanding coherent source and a hydrodynamic incoherent source. In particular, the coherent fraction in the model is consistent with the measurement of HBT correlations. We find that the data on transverse momentum spectrum and elliptic anisotropy $v_2$ in both AA and pp collisions can be well reproduced, resulting from the interplay of the coherent and incoherent modes. Especially, the long-range azimuthal correlations(“ridge”) can arise from the coherent component through the interference effect. This ridge structure can be viewed as an interference pattern in momentum space. Since coherence is more likely to survive in smaller systems due to the less important hot-medium surroundings, this study is expected to provide a new idea for understanding the collective phenomena from small to large systems. A joint study of source coherence in future with both collectivity and HBT correlation will be also discussed. Reference: [1] Peng Ru, G. Bary, and Wei-Ning Zhang, Pion transverse-momentum spectrum and elliptic anisotropy of partially coherent source, Physics Letters B, 777 (2018) 79-85. [2] Peng Ru and Wei-Ning Zhang, Long-range azimuthal correlations for partially coherent pion emission in proton-proton collisions, Physics Letters B, 809 (2020) 135699.
        Speaker: Dr Peng Ru (South China Normal University)
      • 14:28
        Hard probes production in pPb collisions at LHCb 2m
        Prompt charm parir production and prompt $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ cross section ratio are first measured in LHCb $p$Pb collisions at 8.16TeV. Z boson and prompt $D^{0}$ production are also measured at LHCb 8.16 TeV $p$Pb collisions. Results are compared with theory. Prompt charm parir production observes 3 times DPS/SPS enhancement in $p$Pb compared to $pp$. $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ is consistent with unity. Prodction and $R_{\rm{FB}}$ of Z boson and prompt $D^{0}$ are compatible with theoretical predictions.
        Speaker: 迪 杨 (清华大学工程物理系近代物理研究所)
        Poster
      • 14:30
        QLBT: A linearized Boltzmann transport model for heavy quarks in a hot nuclear medium of quasi-particles 2m
        We perform a systematic study on heavy quark dynamics in relativistic heavy-ion collisions. The dynamical evolution of heavy quarks interacting with the quark-gluon plasma (QGP) is simulated via our new QLBT model, which improves the linearized Boltzmann transport (LBT) model by treating the QGP as a collection of quasi-particles. To account for the non-perturbative interactions among quarks and gluons of the hot QGP, the thermal masses of quasi-particles are fitted to decribe the equation of state from lattice QCD simulations using the Bayesian statistical analysis method. Combining QLBT model with our advanced hybrid fragmentation-coalescence hadronization approach, we calculate the nuclear modification factor $R_{AA}$ and the elliptic flow $v_2$ of $D$ mesons at RHIC and the LHC. By comparing our state-of-the-art QLBT model calculation with the experimental data on $D$ meson $R_{AA}$ and $v_2$, we extract the heavy quark diffusion coefficient $D_s$ in the temperature range of $1-4~T_c$ and compare to the values from other groups.
        Speaker: 峰磊 刘 (Central China Normal University)
      • 14:32
        Accurate and Robust PMT Waveform Analysis 2m
        Photomultiplier tube~(PMT) voltage waveforms are the raw data of many neutrino and dark matter experiments. Waveform analysis is usually the first critical step of data processing. Targeting precise timing and charge extraction of photoelectrons, we evaluate several waveform analysis methods, among which direct demodulation, convolutional neural networks and fast Bayesian matching pursuits are the most promising. Time and energy event reconstruction can be improved upon the traditional thresholding methods, most significantly with high energy events when photoelectrons pile up in waveforms.
        Speaker: Dacheng Xu (Tsinghua University)
        Poster
      • 14:36
        微结构探测器和新型电磁量能器的研制与应用 2m
        中国原子能科学研究院中高能物理团队通过国内外合作,结合自主研发,实现了光刻微结构气体探测器和新型电磁量能器等先进探测器的自主生产,性能指标达到国际标准。目前已经为原子能院院、高能所、近物所、中国散裂中子源、欧洲核子中心、美国BNL实验室、法国Saclay实验室等多个单位研制了探测器、读出和测试系统,对多个国家项目提供重要支撑。
        Speaker: Prof. Xiaomei Li (China Institute of Atomic Energy)
      • 14:38
        $J/\psi$ production in Au+Au collisions at $\sqrt{s_\mathrm{NN}} = 54.4$ GeV 2m
        Heavy quarkonia are ideal probes of the Quark-Gluon Plasma (QGP). $J/\psi$ is the most abundantly produced quarkonium state accessible experimentally and its suppression due to the color screening effect in hot and dense medium has been suggested as a signature of the formation of the QGP. Besides the screening effect, there are other mechanisms, such as the cold nuclear effects and charm quark recombination, which could affect the $J/\psi$ yield in heavy-ion collisions. Measurements of $J/\psi$ production at different collision energies will help to understand the interplay of these mechanisms. STAR has observed significant suppressions of the $J/\psi$ production at mid-rapidity in Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 39, 62.4, and 200 GeV. However, the nuclear modification factor shows no significant collision energy dependence from SPS to RHIC top energy within large uncertainties. In 2017, STAR took a large sample of 54.4 GeV Au+Au collisions and the statistics is more than ten times of the 39 and 62.4 GeV Au+Au data. In this talk, we will present new measurements of the inclusive $J/\psi$ production in Au+Au collisions at $\sqrt{s_\mathrm{NN}} = 54.4$ GeV. The collision energy and transverse momentum dependences of the nuclear modification factor will be presented. Physics implications of these results will also be discussed.
        Speaker: Kaifeng Shen (University of Science and Technology of China)
        Poster
      • 14:40
        Measurement of EW bosons production with ALICE (on behalf of ALICE Collaboration) 2m
        W and Z bosons are produced in the initial stage partonic hard scatterings in high energy hadronic and heavy-ion collisions. The measurement of W and Z bosons production in p-Pb and Pb-Pb collisions at the LHC energies provide constraints on the nuclear modified parton distribution function (PDF) in a phase-space region that is hardly accessed by previous experiments. Production of W and Z bosons are measured via muonic decays at forward rapidity (2.5 < y_lab < 4), in p-Pb and Pb-Pb collisions with ALICE detectors. The results provide a clear picture of the initial state to interpret the later stages characterising the complex the evolution of p-Pb and Pb-Pb collision systems. In this report, recent measurements on the production of Z and W bosons in p-Pb and Pb-Pb collisions at central-of-mass energy of 8.16 and 5.02 TeV will be, respectively, presented. The invariant production yield and the nuclear modification factor as a function of rapidity and collision centrality are demonstrated and compared to that from other LHC experiments along with predictions with and without considering the nuclear modifications on the PDF.
        Speaker: Mingrui Zhao (China Institute of Atomic Energy)
      • 14:42
        Lepton pair production in ultra-peripheral collisions in classical field approximation 2m
        We study the lepton pair production in the ultra-peripheral collisions (UPC) in classical field approximation. We derived a general expression of impact parameter dependent differential cross section of lepton pair production including the transverse momentum and space dependent distribution of photons based on the quantum electrodynamics (QED) calculations. Our differential cross section in classical field approximation contains the results from generalized equivalent photon approximation (EPA) and the corrections beyond EPA in Born approximation. We also rewrite our differential cross section in the light cone formalism. Finally, our numerical results are consistent with the current experimental data.
        Speaker: 仁杰 王 (University of Science and Technology of China)
      • 14:44
        Revisit local spin polarization beyond global equilibrium in relativistic heavy ion collisions 2m
        We have studied local spin polarization in the relativistic hydrodynamic model. Generalizing the Wigner functions previously obtained from chiral kinetic theory in Ref. [1] to the massive case, we present the possible contributions up to the order of ~ from thermal vorticity, shear viscous tensor, other terms associated with the temperature and chemical-potential gradients, and electromagnetic fields to the local spin polarization. We then implement the (3+1) dimensional viscous hydrodynamic model to study the spin polarizations from these sources with a small chemical potential and ignorance of electromagnetic fields by adopting an equation of state different from those in other recent studies. Although the shear correction alone upon local polarization results in the sign and azimuthal-angle dependence more consistent with experimental observations, as also discovered in other recent studies, it is mostly suppressed by the contributions from thermal vorticity and other terms that yield an opposite trend. It is found that the total local spin polarization could be very sensitive to the equation of states, the ratio of shear viscosity over entropy density, and freezeout temperature.
        Speakers: Shi Pu (University of Science and Technology of China) , 聪 易 (USTC)
    • 15:30 15:40
      Coffee Break 10m
    • 15:40 17:10
      Parallel Session III:Heavy Ion Physics: Heavy Flavor (Chair: 冯笙琴)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 15:40
        Overview of recent highlights on open heavy-flavor production with ALICE at the LHC 25m
        Speaker: Xiaoming Zhang (Central China Normal University)
      • 16:05
        Measurement of the inclusive $J/\psi$ production in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with ALICE 15m
        Speaker: Xiaozhi Bai (University of Science and Technology of China)
      • 16:20
        $J/\psi$ production in jets in p+p collisionsat $\sqrt{s}$ = 500 GeV 15m
        Speakers: Qian Yang, Dr Qian Yang (Shandong University) , Qian Yang (Shandong University)
        Slides
      • 16:35
        Measurement of $D^±$ meson production and total charm production yield at midrapidity in Au+Au collisions at $\sqrt{s_NN}$ = 200 GeV with the STAR experiment 15m
        Speaker: Xinyue Ju
      • 16:50
        Recent measurements on open heavy flavor at STAR 15m
        Speaker: Xiaolong CHEN
    • 15:40 17:30
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 15:40
        Flavor Invariants and CP Violation in the Leptonic Sector with Majorana Neutrinos 15m
        The flavor invariants, which are invariant under the unitary transformation in the flavor space, turn out to be a powerful tool in studying the CP violation in a model-independent way. In this talk, I will discuss the application of the flavor invariants in constructing the sufficient and necessary conditions of CP conservation in the leptonic sector with Majorana neutrinos. Furthermore, the systematic construction of all the basic invariants using the method of Hilbert series will be briefly introduced.
        Speaker: 郁槟榕 (高能所)
        Slides
      • 15:55
        Feasibility of detecting 8B solar neutrinos at JUNO 15m
        In this talk we describe in detail the feasibility of detecting $^8$B solar neutrino at JUNO with three reaction channels (neutrino-electron elastic scattering, neutrino-$^{13}$C charged current, and neutral current interactions). A reduced 2 MeV threshold on the recoil electron energy is achievable with optimized background reduction strategies. The advantage of JUNO for charge and neutral current channel detection is a large amount of $^{13}$C ($\sim$0.2 kt). With ten years of data taking, about 60,000 ES signals and 600 NC/CC signal are expected. This leads to a simultaneous measurement of sin$^2\theta_{12}$ and $\Delta m_{21}^{2}$ using reactor antineutrinos and solar neutrinos in the JUNO detector.
        Speaker: Jie ZHAO Jie (高能所)
        Slides
      • 16:10
        1 ↔ 2 Processes of a Sterile Neutrino Around Electroweak Scale in the Thermal Plasma 15m
        We calculate the thermal processes of a a sterile neutrino with the mass around the electroweak scale 50 GeV ≤ mN ≤ 200 GeV, within this range we developed the method to calculate the 1<->2 process with thermal corrections around the electroweak crossover. Preliminary calculations of leptogenesis have also been performed.
        Speaker: Yi-Lei Tang (中山大学)
      • 16:25
        Measurement of Cosmogenic Background at China Jinping Underground Laboratory 15m
        Solar-, geo-, and supernova neutrino experiments are subject to the background from cosmic-ray muons and muon-induced neutrons. China Jinping Underground Laboratory (CJPL), with its unique advantage of 2400 m rock coverage and far away from nuclear power plants, is ideal for neutrino search. Using a 1-ton prototype detector of the Jinping Neutrino Experiment, we detected 343 high-energy cosmic-ray muons and (6.24±3.66) muon-induced neutrons from an 820.28-day dataset at the first phase of CJPL (CJPL-I). The cosmic-ray muon flux is measured to be $ \rm (3.61\pm 0.19_{stat.}\pm 0.10_{sys.} )\times 10^{-10}\ cm^{-2}s^{-1} $ at CJPL-I, and the cosmic-ray muon flux of the second phase of CJPL (CJPL-II) is estimated to be $ \rm (2.3\sim 4.0)\times 10^{-10}\ cm^{-2}s^{-1} $ by Geant 4 simulation. The neutron yield in liquid scintillator is measured to be $ Y_{\rm LS}=(3.13\pm 1.84_{\rm stat.}\pm 0.67_{\rm sys.})\times 10^{-4}\ \mu^{-1}\rm g^{-1}cm^{2} $ with average muon energy at 340 GeV in CJPL-I, and estimated to be $ (3.4\sim 3.7)\times 10^{-4}\ \mu^{-1}\rm g^{-1}cm^{2} $ in CJPL-II. A global fit including this measurement shows a power-law coefficient of (0.75±0.02) for the dependence of the neutron yield at liquid scintillator on muon energy. The measurement of cosmogenic background in CJPL could serve as a basis for future large-scale detector development, like Jinping Neutrino Experiment, CDEX, and PandaX.
        Speaker: Mr Lin Zhao (Department of Engineering Physics, Tsinghua University)
        Slides
      • 16:40
        Reconstruction with Water-based scintillator 15m
        We proposed to build a Cherenkov scintillation detector with kilo-ton fiducial mass in China Jinping Underground Laboratory. We have made significant progress in developing the water-based liquid scintillator (WbLS) technique and optimizing the detector geometry. WbLS emits Cherenkov and scintillation photons for each charged particle. With the feature of the delayed scintillation light and the uniformity of the scintillation, we can separate two types of lights and rebuild particle energy and direction. We used Jinping simulation and analysis package to simulate uniform electrons in WbLS, the light yield of scintillation is set up to $240$ photons/MeV, PMT coverage is $30\%$. Then we construct a complete optical model of Cherenkov+scintillation to reconstruct the vertex, energy, and direction according to the time and space profile of the scintillation and Cherenkov lights. For $5$ MeV electrons, the reconstructed result shows that the angular resolution (the resolution is defined as $68\%$ inclusion) is about $28$ degrees, the energy resolution is about $11\%$. The one-dimensional vertex resolution is approximately $94$ mm. In this way, we could suppress the backgrounds and improve the measurement accuracy of solar neutrinos.
        Speaker: Wentai Luo (University of Chinese Academy of Sciences)
        Slides
      • 16:55
        Reconstruction of Particle Trace in Liquid Scintillator Detector 15m
        Liquid scintillator detectors are used in many neutrino experiments, in which ionizing radiation deposits energy, scintillates, and is finally detected by PMTs. $\gamma$ from natural radioactivity has strong penetrative power, and causes Compton effects including background. We conjecture that efficiency of PID could be increased, if the particle tracks could be reconstructed, and $\beta/\gamma$ could be identified. We fit the time profile of photon electrons of the PMTs fired by the vertices, into the probe function described approximately by polynomials, based on simulation data of point-like events in Jinping 1t detector. Then, the Bayesian Probe for Point-like Events (BAPPE) algorithm could be established, based on Fast Bayesian Matching Pursuit (FBMP), a waveform analysis algorithm. A reconstruction algorithm for multiple point-like events could be implemented consequently, and finally it will reconstruct the particle tracks.
        Speaker: 宇逸 王 (清华大学)
        Slides
    • 15:40 17:10
      Parallel Session I:TeV and BSM Physics: (Chair: Manqi Ruan)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 15:40
        Higgs & Top Physics at the CEPC 15m
        Higgs & Top Physics at the CEPC
        Speaker: Prof. Yaquan FANG (IHEP)
        Slides
      • 15:55
        EW Physics at the CEPC 15m
        EW Physics at the CEPC
        Speaker: Prof. Zhijun Liang (IHEP)
        Slides
      • 16:10
        Flavor Physics Program at the CEPC 15m
        Flavor Physics Program at the CEPC
        Speaker: Lingfeng Li (HKUST)
        Slides
      • 16:25
        QCD measurements at the CEPC 15m
        QCD measurements at the CEPC
        Speaker: Dr HuaXing Zhu (Zhejiang University)
        Slides
      • 16:40
        BSM program at the CEPC 15m
        BSM program at the CEPC
        Speaker: Dr Yang Zhang (Zhengzhou University)
        Slides
      • 16:55
        Progress of the new software framework for future Higgs factories 15m
        Progress of the new software framework for future Higgs factories
        Speaker: Dr Tao LIN (IHEP)
        Slides
    • 15:40 17:30
      Parallel Session V:Particle Detector Technology
      Convener: Prof. 树彬 刘 (University of Science and Technology of China)
      • 15:40
        Development status of the neutron detectors for instruments at CSNS 20m
        Neutron science and technology plays an irreplaceable role in national defense and industry. China spallation neutron source (CSNS) is a major science and technology platform for multidisciplinary applications. As one of the most expensive core equipment of neutron instruments, the neutron detector suffers from the technical blockade from the developed countries, and has become a neck bottle problem restricting the construction and operation of neutron instruments at CSNS. Based on the requirements of the instruments, many common key technologies of neutron detectors have been solved, a detector system of large-scale engineering application has been preliminarily established. A professional and young team has been cultivated to be engaged in developing the advanced neutron detectors. The team has completed the construction of neutron detectors for General Purpose Powder Diffractometer (GPPD), Small Angle Neutron Scattering (SANS) and Multifunctional Reflectometer (MR). The team developed a large area of scintillator detector (5 m2) (shown in Fig.1 (a) ), a large area of 3He tube detector (1 m2) (shown in Fig.1 (b)), 3He MWPC detector (shown in Fig.1 (c)), high flux two-dimensional GEM neutron detector, neutron imaging detector and seven GEM neutron beam monitors (shown in Fig.1 (d)). These detectors passed the national acceptance in August 2018 and the performances reach or even exceed the international advanced level. In the next stage, the detectors will be further developed to realize better performances including larger area, higher spatial resolution, higher detection efficiency and higher integration. These detectors will be provided for many neutron sources in China and this will promote the vigorous development of neutron science and technology in China.
        Speakers: Mr 健荣 周 (中国科学院高能物理研究所东莞分部) , Mr 志嘉 孙 (中国科学院高能物理研究所东莞分部)
      • 16:00
        基于新型缪子及其次级粒子符合探测技术的小尺寸中低Z物质四维成像系统模拟研究 15m
        基于宇宙射线缪子的散射和透射技术对大尺寸和高原子序数物质(Z)物质成像是当前辐射探测成像领域的研究的两大方向,但基于缪子及其次级粒子符合探测技术对厘米级、中低Z物体的成像研究鲜有报道。初步搭建了一套由3层位置灵敏型探测器和4个快时间响应的塑料闪烁体探测器构成的体积为0.125m3的成像系统并利用Geant4软件模拟对该系统进行了模拟研究,利用缪子径迹及其次级粒子的符合探测技术获取缪子径迹和次级粒子的信息,使用以上采集的入射缪子径迹信息完成了待测物体的空间三维成像,利用次级粒子的信息完成了待测物体在Z上维度的分辨,实现了对物体的四维成像。
        Speaker: Mr Xuantao Ji (南华大学)
      • 16:15
        新型低温粒子探测器NTD-Ge传感器的研发 15m
        基于声子的探测技术——量热器,是近年来新发展起来的革命性探测方法,具有远超出常规探测技术的高灵敏度、低噪声水平等特性,是粒子探测技术的新发展方向。声子传感器是mK深冷低温量热器的关键部件,中子核嬗变掺杂高纯锗传感器(Transmutation Doped Ge Thermistors,NTD-Ge)是目前国际上主流的深冷低温声子传感器,是基于温度变化导致电阻急剧变化的原理。目前国内没有现成的产品,国际上也是配合低温粒子探测器所需要研制的特殊元件。NTD-Ge动态范围大,在粒子物理领域有较大的应用前景。本报告将主要介绍中科大团队自主研发设计NTD-Ge传感器的技术路线,着重介绍基于微结构气体探测器MMD、硅漂移半导体探测器SDD以及溴化镧闪烁体探测器LBC,实验与模拟相结合,对NTD-Ge研发中经北京原子能研究院401所反应堆中子辐照后的绝对中子通量的测试估算方法。
        Speaker: 明萱 薛 (University of Science and Technology of China)
        Slides
      • 16:30
        基于散射成像法的宇宙线缪子动量测量研究 15m
        宇宙线缪子成像是当前核探测及应用的一个热点研究方向。由于宇宙线缪子具有动量高、范围广并且方向不确定等等原因,使得其动量在实际应用中难以测量。我们将利用散射成像实验装置进行实验测量,通过对散射成像的理论及分析算法进行创新性地研究,提出一种基于散射成像法的宇宙线缪子动量测量方式,用于简单、实用地实验测量高动量缪子。
        Speaker: Dr 群刚 文 (安徽大学)
        Slides
      • 16:45
        基于Micromegas的高分辨缪子成像系统研究 15m
        对物体内部结构和成份进行无损探测和成像,是认识物质世界的最直接手段之一。当前,X射线、电子、质子、中子等辐射成像技术已经应用到生产、生活以及科学研究的方方面面。然而,由于人造射线穿透力和覆盖面积有限,在特殊核材料检测和大尺度物体成像方面,仍存在很大的局限性。除了上述人造射线外,在地球表面,还有一种无处不在的射线——宇宙线缪子,其具有穿透强、覆盖范围大、无辐射危害等优点,能解决上述应用所面临的困难。 目前,宇宙线缪子成像技术发展尚未成熟,有大量的难点与挑战亟待攻克。本研究利用Micromegas探测器开展高分辨缪子成像系统研究,旨在研制一套高分辨、多用途的缪子成像装置(μSTC——μ Scattering and Transmission imaging faCility)。本套装置利用热熔胶工压接工艺实现的大面积、高位置分辨Micromegas探测器作为径迹测量模块,使用位置编码压缩方法和高集成度、可扩展读出电子学系统进行读出。根据不同用途,该成像装置可配置为散射成像和透射成像两种模式。基于散射成像模式,目前已开展物质成像和区分实验,可以在数小时内实现2cm尺寸的物质成像。基于透射成像模式,对中国科学技术大学教学科研楼展开了测试,可以在数天实现建筑物成像。 本研究将继续开展大面积、高分辨成像系统研制,并展开中小型重核材料成像和火山、大型人工建筑成像。
        Speaker: Dr Yu Wang (State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China)
        Slides
      • 17:00
        基于中国散裂中子源的正反缪子素转换实验 15m
        寻找带电轻子味道数破坏(cLFV)是探索超出标准模型新物理的有效手段之一。目前国际上欧美日均在投入大量资源寻找不同的cLFV过程。基于中国散裂中子源的高强度质子加速器,我们规划了一条高重复频率脉冲缪子源(HEMS)。基于该缪子源,我们提出了一项寻找正反缪子素转换过程的实验 – MuMuBar。该实验将以不同于目前国际上任何实验的方法寻找cLFV过程。本报告将介绍缪子源的设计进展以及MuMuBar实验的设计方案和缪子素产生、探测等技术进展。
        Speaker: 煜 鲍
      • 17:15
        The 3-inch PMT system of JUNO experiment 15m
        A 20 kton liquid scintillator (LS) detector was designed in the Jiangmen Underground Neutrino Observatory (JUNO) for multiple physical purpose. In order to determine the neutrino mass ordering, JUNO needs an excellent energy resolution [3%/√E(MeV)] and an accurate energy scale determination [better than1%]. The JUNO experiment will install 25k 3-inch PMTs (SPMTs) in the gaps between 18k closely packed 20-inch PMTs (LPMTs). Both systems will detect the same IBD signals, but the SPMTs will almost always work in single photoelectron mode. As a result, they will help constrain some of the systematics in the LPMT energy reconstruction, improving the energy resolution and the sensitivity of neutrino mass hierarchy measurement. They will also improve the performance of muon reconstruction, help reduce muon-related isotope backgrounds, provide an independent measurement of the θ12 and ∆m_21^2 solar parameters with unprecedented precision, and it also has the potential to improve measurements of supernova neutrinos and proton decay. All 25k 3-inch PMTs have been produced by the Hainan Zhanchuang Photonics Technology Co., Ltd (HZC) company in China and passed all acceptance tests. Electronics, high voltage divider, SPMT potting, cabling, connector and underwater box are all making good progress. Integration testing is underway. After potting, all PMTs will be tested again in Guangxi University before deliver to JUNO onsite. Until now, about 8k PMTs were measured and they shown good performances after potting. This talk will provide an overview of the design, status and performance testing of the 3-inch PMTs of JUNO.
        Speaker: Yongbo Huang (Guangxi University)
        Slides
    • 15:40 17:10
      Poster Session
      • 15:40
        Light Nuclei Production in Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV from STAR experiment 2m
        Light nuclei, such as deuteron and triton, are loosely bound objects. Their yields are expected to be sensitive to baryon density fluctuations and can be used to probe the QCD critical point and the signatures of a first-order phase transition in heavy-ion collisions. In 2018, RHIC started the second phase of the beam energy scan program (BES-II). The STAR Fixed Target (FXT) program was proposed to achieve lower center-of-mass energies and higher baryon density regions. Up to now, the STAR experiment has recorded high statistics data at $\sqrt{s_{\mathrm{NN}}}$ = 3 - 7.7 GeV in Au+Au collisions. In this talk, we will present light nuclei production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV (FXT) recorded by the STAR experiment in 2018. We will show the transverse momentum spectra of proton ($p$), deuteron ($d$), triton ($t$), $^{3}\mathrm{He}$, and $^{4}\mathrm{He}$ at various rapidity ranges. The rapidity and centrality dependence of coalescence parameters $B_2(d)$, $B_3(t)$, and $B_3({ }^{3}\mathrm{He})$, and particle ratios ($d/p$, $t/p$, $t/d$, $^{3}\mathrm{He}/p$ and $^{4}\mathrm{He}/p$) will be shown. In addition, the kinetic freeze-out temperature $T_{\mathrm{kin}}$ and average radial flow velocity $\langle\beta\rangle$ will also be discussed.
        Speaker: Hui Liu (Central China Normal University)
        Poster
      • 15:42
        A method for sharing dynamic geometry information in studies on liquid-based detectors 2m
        Liquid-based detectors are widely used in particle and nuclear physics experiments. Because fixed method is used to construct the geometry in detector simulations such as Geant4, it is usually difficult to describe the non-uniformity of the liquid in a detector. We propose a method based on geometry description markup language and a tessellated detector description to share the detector geometry information between computational fluid dynamics simulation software and detector simulation software. This method makes it possible to study the impact of a liquid flow and non-uniformity on the key performance of a liquid-based detector, such as the event vertex reconstruction resolution. This will also be helpful in the detector design and performance optimization.
        Speaker: 静舒 李 (Sun Yat-Sen (Zhongshan) University)
        Poster
      • 15:46
        Design and Study of Electromagnetic Calorimeter for Super Tau-Charm Facility 2m
        Modern $e^{+}e^{-}$ colliders will reach an exceedingly high level of luminosity, like SuperKEKB, Super Charm-Tau Factory (SCTF) proposed by Russia, and Super Tau-Charm Facility (STCF) proposed by China. Under such a high event rate and additional beam background, the electromagnetic calorimeter should be capable of maintaining good energy and position resolution while dealing with pile-up pulses and fake signals. A calorimeter system based on fast pure CsI crystal, read out by avalanche photodiodes, highlighting good time resolution and high granularity is designed for STCF. This talk will expand from three aspects: Tests of the scintillation counter; Geometry optimization and simulated performance of calorimeter system; Severe performance deterioration caused by beam background with possible solutions.
        Speaker: 泽坤 贾 (USTC)
      • 15:52
        Progress on the CMS-HGCAL silicon modules: assembly and quality control 2m
        In the Module Assembly Center (Beijing) for the CMS-HGCAL project, extensive studies have been performed for the silicon module assembly, along with the commissioning of major equipment, including a large-scale high-precision gantry system, a fully automated wire-bonding machine, an optical gauge for non-contact measurements in three dimensions. Recently a first 8-inch silicon module has been successfully assembled and is now being tested, after laborious exercises with dummy modules. This talk will present the highlights of the module assembly, quality control procedures and module testing.
        Speaker: Dr Feng Wang (Institute of High Energy Physics)
      • 15:54
        The Application of the geo-magnetic shielding in WCDA 2m
        Due to the large size of 20 inch MCP PMT, the geomagnetic field have big influence on the performance of PMT, including time response and detect efficiency. A Permalloy shielding had been installed on all 20 inch MCP-PMT. Permalloy can change the direction of the magnetic field because of its higher permeability compared to ordinary steel. Since the magnetic field is guided through a low magnetic resistance path, it ensures that the PMT is not affected by the geomagnetic field. In this work, we will report on the application of magnetic shield on 20 inch MCP-PMT at LHAASO-WCDA.
        Speaker: Mr Xiaohao You (IHEP)
        Poster
      • 15:56
        RHIC能区喷注淬火的系统尺寸依赖的实验研究 2m
        喷注淬火指喷注与由高能重离子对撞产生的夸克胶子等离子体(QGP)中的部分子相互作用从而损失能量的现象。RHIC能区已经在重核对撞,如金-金中心碰撞中观测到明显的喷注产额压低。此外,小系统(质-核对撞)中喷注淬火的研究也是当下热点之一。而在$\sqrt {s_{\rm NN}}=$ 200 GeV的锆-锆和钌-钌 ($\rm Ru^{44}_{96}+Ru^{44}_{96}$ and $\rm Zr^{40}_{96}+Zr^{40}_{96}$)碰撞能提供介于上述两种系统尺度之间的介质环境。我将讨论在同质异位素中以高横动量强子为触发的反冲半单举喷注的测量,用anti-k$_{T}$算法对带电粒子进行从0.2到0.4不同喷注锥体半径R的喷注重建,并用混合事例的技术对背景进行扣除。通过不同碰撞系统中喷注的比较,进一步了解部分子能量损失与初态能量密度、温度、热密介质大小的关系。
        Speaker: Ms Yang He (Shandong University)
        Slides
      • 16:00
        Heavy and light jet quenching in different collision systems at the LHC energies 2m
        \begin{abstract} Recent experiments have observed large anisotropic collective flows in high multiplicity proton-lead collisions at the Large Hadron Collider (LHC), which indicates the possible formation of mini quark-gluon plasma (QGP) in small collision systems. However, no jet quenching has been confirmed in such small systems so far. To understand this intriguing result, the system size scan experiments have been proposed to bridge the gap between large and small systems. In this work, we perform a systematic study on both heavy and light flavor jet quenching in different collision systems at the LHC energies. The productions of hard jet partons and hadrons are calculated within a next-to-leading-order perturbative QCD framework, the evolution of heavy and light jet partons inside the QGP is simulated via a linearized Boltzmann transport model, and the space-time profile of the QGP fireball is obtained via a (3+1)-dimensional viscous hydrodynamics simulation. Using our state-of-the-art jet quenching model, we provide a a good description of nuclear modification factor $R_{\rm AA}$ for charged hadrons and $D$ mesons in central and mid-central Pb+Pb and Xe+Xe collisions measured by CMS collaboration. We further predict the transverse momentum and centrality dependences of $R_{AA}$ for charged hadrons, $D$ and $B$ mesons in Pb+Pb, Xe+Xe, Ar+Ar and O+O collisions at the LHC energies. Our numerical results show a clear system size dependence for both light and heavy flavor hadron $R_{AA}$ across different collision systems. This study provides a smooth transition for jet quenching from large to small systems, which helps to identify the unique signatures of QGP droplet and search for the disappearance of QGP in relativistic nuclear collisions.
        Speaker: Mr Yu-Fei Liu (Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan, Hubei, 430079, China)
      • 16:02
        Collective expansion in p-p collisions using the Tsallis statistics 2m
        We investigate the identified hadrons transverse momentum ($p_T$) spectra in proton-proton (pp) collisions at 0.9, 2.76, 5.02, 7 and 13 TeV in the framework of Tsallis-blast wave (TBW) model. In this model, the Tsallis temperature and the average radial flow velocity of the system are common for all hadrons, while the degrees of non-equilibrium are common to all of the mesons and baryons respectively when a combined fit is performed to the pT spectra of different particles at a given energy. It is found that the model can describe the particle spectra well up to 10 GeV/c. The transverse flow velocity as well as the degree of non-equilibrium increases with the center of mass energy, while the Tsallis temperature first increases with energy up to 2.76 TeV and then saturates around 86 MeV. We also extend this model to the identified particle spectra at different charged particle multiplicities in pp collisions at 7 TeV and 13 TeV. It is observed that the radial flow increases with the multiplicity while the degree of non-equilibrium shows the opposite behavior, which is similar to that observed in Pb-Pb and p-Pb collisions at the LHC energy. However, the Tsallis temperature decreases with the multiplicity, which is opposite to the trend observed in Pb-Pb and p-Pb collisions. We proposed a possible explanation for this behaviour. Finally, at similar charged multiplicities, the radial flow in Pb-Pb and p-Pb collisions is smaller than that in pp collisions, which indicates that the size of the colliding system might have significant effects on the final state particle dynamics.
        Speaker: Mr 锦彪 顾 (陕西师范大学)
        Poster
      • 16:04
        Particle-yield modification in jet-like azimuthal $V^{0}$–hadron correlations in $Pb–Pb$ collisions at $\sqrt{s_{_{\rm NN}}} = 5.02$ TeV with ALICE at the LHC 2m
        The measurement of azimuthal correlations between two particles is a powerful tool to investigate the properties of strongly-interacting nuclear matter created in ultra-relativistic heavy-ion collisions. in particular, studying the near-side and away-side hadron yields associated with trigger particles can provide important information to understand both the jet-medium interaction and hadron production mechanism. We study two-particle correlations with $\mathrm{V^{0}}$( $\mathrm{K^{0}_{s}}$,$\Lambda/\overline{\Lambda}$) and charge hadrons as trigger particles of transverse momentum $8 < p_\mathrm{T,trig} < 16 \mathrm{GeV}/c$,and associated charged particles of $1 \mathrm{GeV}/c< p_\mathrm{T,assoc} < p_\mathrm{T,trig}$ at mid-rapidity in pp and Pb–Pb collisions at a center-of-mass energy of $5.02$ TeV per nucleon pair. After subtracting the contributions of the flow background $v_{2}$ and $v_{3}$ , the per-trigger yields are extracted for two-particle azimuthal differences$|\Delta\varphi|<0.9$ on the near-side and $|\Delta\varphi-\pi|<1.2$ on the away-side. The ratio of the per-trigger yields in Pb–Pb collisions with respect to pp collisions , $I_\mathrm{AA}$ , is measured in the near-side and away-side in the most central $0-10\%$ collisions.On the near-side, a significant enhancement of $I_\mathrm{AA}$ from 1.5 to 2 for different particles species is observed at the lowest $p_\mathrm{T,assoc}$. On the away-side, suppression to the level of ($I_\mathrm{AA}$ $\approx 0.6$ ) for $p_\mathrm{T,assoc}>3 \mathrm{GeV}/c$ is observed as expected from strong in-medium energy loss while an enhancement reaching 2 at lowest $p_\mathrm{T,assoc}$ . The data are compared to AMPT, HIJING and EPOS models. Most calculations qualitatively describe the near-side and away-side yield modification at intermediate and high $p_\mathrm{T,assoc}$.
        Speaker: Mustafa Anaam (PHD student)
        Poster
      • 16:08
        Explore the collision geometry using the linear polarized photons 2m
        Relativistic heavy ions carry giant electromagnetic fields which can be equivalent to a field of quasireal and linearly polarized virtual photons. The vector meson production from linearly polarized photons possesses a distinctive signature in the asymmetries of the decay angular distributions. We compute the second-order modulation in azimuth as function of the vector meson (${\rho}_{0}$ and $J/\psi$) transverse momentum pt and the impact parameter b in non-central heavy-ion collisions. Our study shows that the second-order modulation sensitively relies on the impact parameter, which provide a new method to determine the reaction plane. This method is independent of the evolution of QGP, it can help us better relate the anisotropy of the final momentum space to the anisotropy of the initial coordinate space.
        Speaker: 鑫 吴 (中国科学技术大学)
        Slides
      • 16:12
        Lifetime measurements of $^3_{\Lambda}H$ and $^4_{\Lambda}H$ in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.2 GeV from STAR fixed target mode experiment 2m
        Hypernuclei are bound nuclear systems of non-strange and strange baryons, i.e. nucleons and hyperons. As such, hypernuclei are correlated hyperon-baryon systems and therefore provide direct access to study the hyperon$-$nucleon (Y-N) interaction. Production of hypernuclei in collider systems provides an experimental avenue for studying the Y-N interaction. $\Lambda$ hypernuclei, such as $^3_{\Lambda}H$ and $^4_{\Lambda}H$, are usually understood as a weakly bound system of a $\Lambda$ and a nucleus. According to this concept, the $\Lambda$ maintains its identity even if embedded in a system of other nucleons. Since the lifetime of a hypernucleus depends on the strength of the Y-N interaction, precise lifetime measurements of hypernuclei help us to understand the Y-N interaction. In this talk, we will present the first lifetime measurements of $^3_{\Lambda}H$ and $^4_{\Lambda}H$ in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.2 GeV, recorded by the STAR experiment with a fixed target mode in the year 2018.
        Speaker: Ms Xiujun Li (USTC)
        Slides
      • 16:18
        Data-driven isolation for charm and beauty decay electrons at RHIC and LHC 2m
        Heavy quarks (charm and beauty) are considered ideal probes for the properties of the Quark-Gluon Plasma (QGP) created in heavy-ion collisions. Due to the large mass, they are produced in hard scattering processes at the early stage of the collisions before the QGP, so they can experience the whole evolution of the system. Theoretical partonic energy loss in the QGP shows mass-dependent due to the suppression of the gluon radiation angle by the partonic mass. Also, partons with larger mass could be more difficult to achieve thermalization and follow the collective flow in the hot-dense medium. Because of its three times larger mass compared with the charm mass, beauty could have different properties in terms of its interactions with the QGP medium from charm. We develop a data-driven method to isolate charm and beauty contributions from the inclusive heavy flavor electrons based on recent open charm hadron measurements at RHIC and LHC. The individual electron transverse momentum ($p_{\mathrm{T}}$) spectra, nuclear modification factors ($R_{\mathrm{AA}}$) and elliptic flows ($v_2$) from charm and beauty decays will be reported. Comparisons of the charm and beauty behaviors at RHIC and LHC energies will be given.
        Speaker: Mr Fan Si (University of Science and Technology of China)
        Poster
      • 16:24
        Search for Higgs boson production in association with energetic photon via VBF mode and search for high mass resonance decaying to a Higgs boson and a photon resonance with the ATLAS detector 2m
        This talk will present a search for Standard Model Higgs boson produced in association with high-energy photon via VBF production mode and another search for high mass resonance decaying to a Higgs boson and a photon with the ATLAS detector at $\sqrt{s}$=13 TeV. In both searches, the Higgs boson is required to decay to $b$-quark pairs. For the first search, $pp$ collision data with an integrated luminosity of 132 fb$^{-1}$ are used. A measured Higgs boson signal strength from these data is 1.3$\pm$1.0 corresponding to a 1.3$\sigma$ significance where the expected significance is 1.0. After combining with the search for Higgs boson decaying to $b$-quark pair via VBF production model without photon, the observed significance reaches above 3$\sigma$. Beside the search for non-resonance Higgs boson and photon production, this talk also reports the search result of high mass resonance decaying to a Higgs boson and an energetic photon which uses 139 fb$^{-1}$ $pp$ collision data. This search explores the resonance mass range of 600 GeV - 4 TeV, which results a boosted Higgs boson with two $b$-jets merged. The large-radius jet algorithm is used to reconstruct such Higgs boson and a novel Higgs boson tagging technique, Center-of-mass (CoM) tagger, is performed to improve the performance of identifying the $b$-quark pair decay of the Higgs boson. No significant derivation with respected to the Standard Model prediction is observed from data in the search region and model-independent cross section limits are derived for various resonance hypotheses.
        Speakers: 崔涵, 涵 崔 (University of Chinese Academy of Sciences)
        Slides
      • 16:26
        Di-boson simulation and precise measurement of Zγ analysis in ATLAS detector 2m
        Di-boson process is one important test of the Standard Model Electroweak Symmetry Breaking (EWSB) and perturbative QCD, also the backgrounds for many new physics searches. The study shows the simulation and precise measurement of di-boson processes in pp collisions at √s=13TeV, using a dataset corresponding to an integrated luminosity of 139 fb^(-1) recorded with the ATLAS detector at the LHC. The production of a photon in association with a Z boson with Z decay to a charged lepton pair is considered. Precise measurement of di-boson inclusive processes, which is sensitive to anomalous triple gauge coupling, providing one opportunity to perform BSM study. The simulation procedure and precise measurement of di-boson process are reported.
        Speaker: Danning Liu (Shanghai Jiao Tong University)
        Slides
      • 16:28
        Observation of electroweak production of two jets and a Z-boson pair with the ATLAS detector 2m
        Vector boson scattering processes are important for the current Run 2 and future runs of the Large Hadron Collider. The study of high-energy behaviours of VBS is crucial to understand the nature of the EWSB. At the LHC, the scattering of massive electroweak gauge bosons is accessible through the measurement of purely electroweak production of two jets and two gauge bosons. Among all the EW VVjj processes, ZZjj offers a clean and competitive channel to study EWSB physics. The ATLAS experiment has measured the cross sections for inclusive production of ZZ plus two jets and the observed signal strength of the EW production with 139 fb-1 of pp collision data at √S=13 TeV collected during 2015-2018. Two final states, llll and llνν, are considered. Combined these two final states, the hypothesis of no electroweak production is rejected with a statistical significance of 5.5 σ.
        Speaker: Jing Chen (Shanghai Jiao Tong University)
        Slides
      • 16:30
        Semi-leptonic tt ̅ Calibration of X→bb ̅ tagger 2m
        The identification of massive particles decaying into bottom quark pairs is important for the physics program of the ATLAS experiment at the Large Hadron Collider. A neural network (NN) based double b-tagging algorithm named X→bb ̅ tagger is developed and calibrations of the tagger are performed using proton-proton collision data corresponding to 139〖fb〗^(-1) collected at a centre-of-mass energy of √s=13TeV. The technique of X→bb ̅ mis-tag rate calibration is developed based on semi-leptonic decay tt ̅ events which have rich non- bb ̅ flavor combination and high statistics. The mis-tag efficiency is measured and the scale factor is found to be in a range of 1~1.1 with uncertainty less than 16%.
        Speakers: Mr Qibin Liu (Shanghai Jiaotong University) , Qibin Liu (TDLI., Shanghai JiaoTong University)
        Poster
      • 16:32
        Search for a permanent muon electric dipole moment at the Fermilab Muon g-2 experiment 2m
        The presence of a permanent electric dipole moment (EDM) in any elementary particle implies Charge-Parity (CP) symmetry violation and thus could help explain the matter-antimatter asymmetry observed in our universe. Within the context of the Standard Model (SM), EDMs of SM particles are extremely small. However, in many beyond SM (BSM) theories, EDMs could be within experimental reach in the near future. Recently, the muon EDM is of particular interest due to the tensions in the anomalous magnetic moment of the muon and the electron, and hints of lepton flavor universality violation (LFUV) in B-meson decays. In some of the BSM theories with LFUV, the muon EDM could be as large as 1e-22 e cm. Moreover, the 23 orders of magnitude difference between the current experimental limit (1e-19 e cm) and the SM prediction (1e-42 e cm) means muon EDM is one of the least tested areas of the SM and any detected signal is a strong hint of new physics. In this poster, we will present how the Muon g-2 experiment at Fermilab aims to search for a muon EDM with a better sensitivity.
        Speaker: Tianqi Hu (Shanghai Jiao Tong University)
        Slides
      • 16:36
        R&D for the Dark SHINE hadronic calorimeter 2m
        There has been overwhelming astrophysical evidence that dark matter exists, though it has eluded direct detection so far. The Dark SHINE experiment in Shanghai aims to study the interaction between dark matter and ordinary matter using high-intensity single-electron beam. It will look for missing energy and momentum signals in electron collisions with a Tungsten target. In order to veto rare processes in the Standard Model, such as the electronuclear, photonuclear and dimuon production processes, a hadronic calorimeter with high detection efficiency is needed. In this poster, we will present the current status of the R&D of a baseline hadronic calorimeter, which is consisted of steel absorption layers and scintillator strips with wavelength shifting fibers.
        Speaker: Hanqing Liu (Shanghai Jiao Tong University)
      • 16:38
        Measurement of the branching ratio of radiative muon decay at the Fermilab Muon g-2 experiment 2m
        Studies of muon decay have helped established several parameters in the Standard Model. This decay is almost a pure weak decay and it allows for a high-precision test of the Standard Model and searches for new physics. Radiative muon decay (RMD) is particularly interesting because one of the Michel parameters, the eta parameter η, can be measured only via RMD. The branching ratio for RMD is about 5% for the photon energy above 1 MeV. However, recent measurements of RMD by PIBETA and MEG collaborations utilized muon decay at rest and only focusing on a tiny phase space of the decay. This is due to the challenges in detecting soft photons. In the Muon g-2 experiment, the relativistic gamma-factor of the muon is 29.3 and therefore a 10 MeV photon could be boosted up to 600 MeV. This opens up the possibility to measure a wider phase space of the RMD and therefore a more sensitive search for new physics that could alter the decay branching ratio. In this poster, we will present the current status of our study using Fermilab Muon g-2 experiment to measure the branching ratio of RMD.
        Speaker: cheng chen (Shanghai Jiao Tong University)
        Slides
      • 16:40
        Implement NN Pixel Clustering in ATLAS Inner Detector Trigger for b-jet Signature 2m
        This study has finished the implementation of NN pixel Clustering algorithm of Athena release 22 in the ATLAS Inner Detector Trigger analysis framework for the b-jet signature. An improvement in the tracking efficiency is observed in release 22 offline tracking. The study also helps to improve the tracking efficiency by modifying the truth level tracking information.
        Speaker: Zhen Wang (Shanghai Jiao Tong University)
        Slides
      • 16:42
        Top-Up注入模式下BESIII数据质量研究及离线事例过滤 2m
        Top-up注入模式是加速器的一项新的束流注入模式,在保持对撞流强的近似恒定的同时,缩短了之前束流注入的死时间,有效提高了积分亮度。BESⅢ实验在2019年底首次使用了这项技术,在相同时间内积分亮度提高了近30%。但Top-up模式在束流注入过程中不可避免带来高的束流本底和噪声,影响数据质量。通过对Top-up模式下所取数据的束流本底和噪声的研究,我们结合在线触发和离线处理,设计了完善的离线过滤算法,并对BESIII离线数据处理流程进行了升级,在保证高积分亮度的同时,有效改善了数据质量。
        Speaker: ZHANG Jiawei
      • 16:44
        Particle identification with cluster counting technique for the drift chamber at CEPC 2m
        A good identification of charged kaons is essential for the flavor physics and benefits the determination of jet flavor and jet charge at CEPC for Z-pole operation. To achieve these physics goals, a design of tracking system combining a silicon tracker and a drift chamber is proposed. The drift chamber could provide dN/dx measurements with cluster counting technique, as well as those of dE/dx. A simulation study on the cluster counting technique has been performed with the Garfield++ program, the primary ionization, avalanche processes, and peak finding on the induction signals have been carefully investigated. The result shows that the resolution and separation power with cluster counting technique are significantly better than those of the traditional dE/dx method. The effects of the gas mixture, sampling frequency, signal spreading, and the noises are also taken into account. A prototype system is being prepared to study the feasibility of cluster counting technique.
        Speaker: Shuiting Xin
        Poster
      • 16:46
        TID study of ABCstar Chips for the ATLAS Upgrade Silicon Strip Tracker at the HL-LHC 2m
        The increase of the leakage current of ABCstar chips for the upgrade of ATLAS inner tracker detector during exposure to ionizing radiation will lead to power consumption. Dedicated irradiation experiments for ABC130 chips(predecessor of ABCstar chips) have been performed at BNL and RAL. A dramatic increase of digital current with Total Ionizing Dose (TID) has been observed. Research regarding ABCstar chips is been conducting at RAL, IHEP is also involved in the study. This poster will focus on the latest results from IHEP TID research。
        Speaker: mingming xia (Tsinghua University)
        Slides
    • 15:50 17:25
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 16:05
        Flavor physics at Belle II 15m
        Prosepcts of flavor physics at Belle II will be discussed.
        Speaker: 葳 单 (湖南师范大学)
        Slides
      • 16:20
        Exotic states at Belle II 15m
        Prospects of exotic states at Belle II will be discussed.
        Speaker: 清平 姬 (河南师范大学)
        Slides
      • 16:35
        Progress of EMC software in the PANDA experiment 15m
        The PANDA experiment will be one of the key experiments at the Facility for Antiproton and Ion Research (FAIR) which is under construction and currently being built in Darmstadt, Germany. The EMC software development is in processing in order to achieve good energy and spatial resolution, the capability of an electron hadron separation, and also the feasibility of PANDA physics program. Highlights of digitization, calibration and reconstruction algorithms are presented in the talk. With the updated model of lateral development of electromagnetic shower, the mass resolution of pi0 with high momentum is improved.
        Speakers: Guang Zhao (IHEP) , Dr Sheng-Sen Sun (Institute of High Energy Physics) , ZHAO Guang (高能所)
        Slides
      • 16:50
        Status of EicC 15m
        Status of the R&D and physics prospects of EicC and will be discussed.
        Speaker: 野 田 (Institute of Modern Physics, Chinese Academy of Sciences)
        Slides
      • 17:05
        Experimental Program for Super Tau-Charm Facility 20m
        The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a centerof-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×10^35 cm−2s−1 The energy region of STCF covers the pair production thresholds for tau-leptons, charmed meson & baryons, and all of the strange hyperons. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. Huge samples of XYZ, Jpsi , D+, D+s and Lambdac decays could be used to make precision measurements of the properties of XYZ particles, search for new ones, and study their rare decays; map out the spectroscopies of QCD hybrids and glueballs; search for new sources of CP violation in the strange-hyperon and tau−lepton sectors with unprecedented sensitivity; make precise independent mea- surements of the Cabibbo angle (theta)c) to test the unitarity of the CKM flavor-mixing matrix and address the Cabibbo Angle Anomaly; search for anomalous decays with sensitivities extending down to the level of SM-model expectations; qualify Lattice QCD calculations; and provide precise inputs that are essential for the interpretation of results from other experiments.
        Speaker: Xiaorong Zhou (University of Science and Technology of China)
        Slides
    • 08:30 10:30
      Parallel Session III:Heavy Ion Physics: Hydrodynamics (Chair: 马国亮)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 08:30
        RHIC-STAR重离子碰撞实验中集体运动的研究进展 25m
        Speakers: 梳苏 施, 梳苏 施 (Central China Normal University)
        Slides
      • 08:55
        The fluid nature of the QGP 25m
        Speaker: 慧超 宋
      • 09:20
        Attractor solution and emergence of hydrodynamics in heavy-ion collisions. (吸引子解和重离子碰撞中的流体力学现象) 25m
        Speaker: 力 严
      • 09:45
        高能核碰撞中的QGP纵向演化及轻强子直接流唯象理论研究 15m
        Speaker: Ze-fang Jiang
      • 10:00
        Studying the initial geometry and the QGP properties by directed flow of inclusive jets in heavy-ion collisions 15m
        Speaker: Maowu Nie (Shandong University)
      • 10:15
        Study of nonlinear flow and symmetric cumulants in large and small systems (for ALICE collaboration) 15m
        Speaker: Mingrui Zhao
    • 08:30 10:30
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 08:30
        Study of doubly charmed baryons at LHCb 15m
        Recent results of doubly charmed baryons at LHCb will be reported in this talk.
        Speaker: Yixiong Zhou (University of Chinese Academy of Sciences)
        Slides
      • 08:45
        Recent results of beauty-charm hadrons at LHCb 15m
        Recent results of beauty-charm baryons at LHCb will be reported in this talk.
        Speaker: Shiyang Li (Central China Normal University)
        Slides
      • 09:00
        Measurement of $\Omega_c^0$ and $\Xi_c^0$ lifetime with prompt production at LHCb 20m
        A measurement of the lifetimes of the $\Omega_c^0$ and $\Xi_c^0$ baryons is reported using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment. The $\Omega_c^0$ and $\Xi_c^0$ baryons are produced directly from proton interactions and reconstructed in the $p K^- K^- \pi^+$ final state. The $\Omega_c^0$ lifetime is measured to be $276.5\pm 13.4\pm 4.4\pm 0.7\fs$, and the $\Xi_c^0$ lifetime is measured to be $148.0\pm 2.3\pm 2.2\pm 0.2\fs$, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty of the $D^0$ lifetime. These results are consistent with previous LHCb measurements based on semileptonic $b$-hadron decays but inconsistent with PDG value before 2018, and provide the single most precise measurement of the \Omega_c^0 lifetime.
        Speaker: 冬 敖 (清华大学)
        Slides
      • 09:20
        Leptonic and semileptonic D decays at BESIII 20m
        BESIII has collected 2.9 and 6.3 fb-1 of e+e- collision data samples at 3.773 and 4.178-4.226 GeV, respectively. We report recent measurements of the (semi)leptonic decays D(s) -> l+nu (l=mu, tau) and D(s) -> X l+nu [X=K(*), rho, eta('), a_0, K_1, and l=e, mu]. The decay constants f_D(s), the semileptonic form factors f(0) and the CKM matrix elements |V_cs(d)| are determined precisely. These results are important to verify the LQCD calculations of f_D(s) and f(0) and the CKM matrix unitarity. Tests of lepton-flavor universality with (semi)leptonic D decays will also be reported.
        Speaker: 祥 潘 (高能所)
        Slides
      • 09:40
        Baryon/Lepton number violation searches at BESIII 15m
        The observed matter-antimatter asymmetry in the universe composes a serious challenge to our understanding of nature. BNV/LNV/cLFV decays have been searched in many experiments to understand this large-scale observed fact, and few in the case of $e^+e^-$ collision experiments are performed. In this talk, we present recent results to search for BNV and LNV/cLFV from $J/\psi$, $D^+$, $D^0$ and $\Sigma^+$ decays at the BESIII experiment. For the process with $\Delta B=2$, a search of $\Lambda$-$\bar\Lambda$ oscillation is performed with $J/\psi\to\Lambda\bar\Lambda$ events, and the oscillation rate and oscillation parameters are extracted.
        Speaker: Dr Xiaoshuai Qin (Shandong University)
        Slides
      • 09:55
        Recent result of nucleon time-like form factors at BESIII 15m
        Nucleons are one of the most fundamental building blocks of ordinary matter, yet their internal structure and dynamics are still not fully understood. Electromagnetic form factors allow to investigate fundamental properties of the nucleon. The BESIII collaboration has studied the time-like form factors of the proton using the energy scan and the ISR technique. The |GE/GM| ratio is obtained with a precision comparable to the investigations of the space-like EMFF in electron proton scattering. The effective form factor of the neutron is measured with highest precision using the scan method. For both nucleons, an intriguing periodic behavior of effective form factors lineshape is observed. In this presentation the latest results on nucleon form factors at BESIII are discussed.
        Speaker: Dr Lei Xia (University of Science and Technology of China)
        Slides
      • 10:10
        Hyperon pair production at BESIII 20m
        Hyperons provide an unique avenue to study the strong interaction in baryon structure. Due to their limited life time, the production in e+e- annihilations is the only viable way to obtain information on the hyperon structure and internal dynamics through their electromagnetic form factors. With the unique data sets obtained by the BESIII collaboration, the pair production cross sections for Lambda, Sigma, Xi, and Lambda_c are studied from threshold, where some abnormal threshold effects are observed. Using the self-analyzing weak decays of the Lambda and Lambda_c, the relative phase between the electric and magnetic form factors is measured. In this presentation the latest results at BESIII are discussed.
        Speaker: 维平 王 (University of Science and Technology of China)
        Slides
    • 08:30 10:35
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 08:30
        Direct neutrino mass measurements with KATRIN experiment 15m
        The discovery of neutrino oscillation proves that neutrinos must have non-zero mass. While the differences of squared neutrino mass eigenvalues have been probed by neutrino oscillation experiments, the absolute neutrino mass scale still remains one of the most important open questions in particle and astroparticle physics. By exploiting the single $\beta$ decay of molecular tritium, the Karlsruhe Tritium Neutrino (KATRIN) experiment currently provides the best sensitivity down to sub-eV level in direct, model-independent neutrino mass measurements. This report will focus on the latest results from the first two scientific campaigns of the KATRIN experiment.
        Speaker: Weiran Xu (Massachusetts Institute of Technology)
        Slides
      • 08:45
        CDEX暗物质实验现状与展望 15m
        CDEX合作组自2009年以来在世界岩石覆盖最深的锦屏地下实验室使用点电极高纯锗锗探测器开展暗物质直接探测。最近,基于CDEX-1和CDEX-10实验发表了多项国际先进水平的物理结果,包括暗物质年度调制效应分析[1]、基于Migdal效应的亚GeV轻暗物质搜索[2]、暗光子探测[3]、太阳轴子和类轴子探测[4]、有效场论框架下的WIMP探测[5]等。目前正在开展50公斤级高纯锗阵列暗物质实验(CDEX-50dm)的准备和关键技术预研,如锗晶体生长、高纯锗探测器自主研制、地下实验室低本底电解铜、低噪声低阈值前端电子学等。本报告将讨论CDEX暗物质实验的现状以及未来展望。 1. L. T. Yang et al., (CDEX Collaboration) Light WIMPs Search by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory, Phys. Rev. Lett. 123, 221301 (2019) 2. Z. Z. Liu et al., (CDEX Collaboration) Constraints on spin-independent nucleus scattering with sub-GeV WIMP dark matter from the CDEX-1B Experiment at CJPL, Phys. Rev. Lett. 123 161301 (2019) 3. Z. She et al., (CDEX Collaboration) “Direct Detection Constraints on Dark Photons with CDEX-10 Experiment at the China Jinping Underground Laboratory” Phys. Rev. Lett. 124, 111301 (2020) 4. Y. Wang et al. (CDEX Collaboration) “Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using profile likelihood ratio method” Phys. Rev. D 101, 052003 (2020) 5. Y. Wang et al., (CDEX Collaboration), First experimental constraints on WIMP couplings in the effective field theory framework from CDEX, Sci. China-Phys. Mech. Astron. 64, 281011 (2021)
        Speaker: Dr 丽桃 杨 (Tsinghua University)
      • 09:00
        Results of dark matter search using the full PandaX-II exposure 15m
        We report the dark matter search results obtained using the full 132 ton$\cdot$day exposure of the PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess of events is identified above the expected background. Upper limits are set on the spin-independent dark matter-nucleon interactions. The lowest 90$\%$ confidence level exclusion on the spin-independent cross section is $2.2\times 10^{-46}$ cm$^2$ at a WIMP mass of 30 GeV/$c^2$.
        Speaker: 秋红 王 (复旦大学)
        Slides
      • 09:15
        CDEX-300ν实验计划 15m
        无中微子双贝塔衰变测量实验是当前粒子物理与核物理研究领域的重要科学前沿,对中微子性质研究具有重大意义。采用高纯锗探测器开展$^{76}$Ge无中微子双贝塔衰变测量实验具有低本底、高效率、最高能量分辨率的优势。CDEX-300ν实验计划在锦屏地下实验室(CJPL)建立300公斤级高纯锗探测器阵列($^{76}$Ge同位素丰度达到86%),结合液氩反符合探测器开展无中微子双贝塔衰变研究。本报告将重点介绍CDEX-300ν实验的概念设计和未来计划,以及探测器、电子学、低本底等关键技术的研发进展。
        Speaker: Hao Ma (Tsinghua University)
        Slides
      • 09:30
        利用PandaX-II全部数据限制自相互作用暗物质 15m
        传统的暗物质模型WIMP(大质量弱相互作用粒子)成功的解释了宇宙大尺度结构的形成,但它在解释观测星系中暗物质分布方面困难重重。近年来,研究人员假设暗物质之间存在相互作用,并且预言了这种相互作用是通过一个小质量的传播子来传递的,也就是所谓的自相互作用暗物质模型。研究表明自相互作用暗物质模型可以很好地解决传统冷暗物质理论与星系观测间的矛盾。如果该轻质量传播子和标准模型粒子比如光子发生耦合,那么在暗物质直接探测实验上就可以产生可观测的信号,通过探测这类信号,就可以证实自相互作用暗物质的存在。另外,标准大爆炸核合成理论可以对轻传播子的寿命做出限制,进而可以对自相互作用暗物质模型预言的轻传播子质量做出限制。本报告将结合PandaX-II暗物质直接探测实验全部曝光量的数据,汇报一下在PandaX-II暗物质探测实验上搜寻轻质量传播子和标准模型粒子碰撞产生的信号的最新进展,以及来自暗物质直接探测实验和大爆炸核合成理论对轻质量传播子质量的联合限制。
        Speaker: Jijun Yang (SJTU)
        Slides
      • 09:45
        CDEX实验中基于Migdal效应的百兆电子伏特轻暗物质探测 15m
        近年来理论学家提出的Migdal效应认为, WIMPs粒子与靶核发生反应的是非弹性散射,有一定概率在发生核反冲的电离或激发出电子且电子能量会大于核反冲能量。通过探测反冲电子与反冲核的总能量,可以在实验硬件阈值不变的情况下,获得对更轻质量暗物质的灵敏度限制。 基于Migdal效应,利用CDEX-1和CDEX-10实验数据开展了亚GeV区域的轻暗物质搜索。暗物质直接探测的质量下限降低一个数量级至50MeV,大大扩展了实验所能约束的暗物质质量空间并给出了新的灵敏限制。本报告将总结CDEX-1B实验和CDEX-10实验亚GeV轻暗物质探测的物理分析结果,并讨论地球屏蔽效应的影响。
        Speaker: Mr 仲智 刘 (清华大学)
        Slides
      • 10:00
        Search for sub-GeV dark matter boosted by the cosmic rays using the full PandaX-II exposure data 15m
        The PandaX-II experiment, located in the China Jinping Underground Laboratory(CJPL), operated with the dual phase xenon time projection chambers. Scintillation and ionization signals generated by the scatting between the incoming particle and xenon atoms are used for the dark matter(DM)-nucleus interactions study. Also, the DM-nucleus interactions will allow the cosmic rays, like protons or helium nuclei, to scatter with and boost the non-relativistic DM to higher energies. In this work, we apply the unique diurnal effect of the cosmic ray boosted dark matter(CRDM) signal and the reconstructed energy to search for the low mass dark matter, with the PandaX-II full exposure data. Local mountain structure and the earth form factor effect are considered for the signal performance in the detector. All the background and uncertainty are carefully studied with the calibration data. No significant excess is found and we conclude a strong constraint on the low mass range.
        Speaker: 祥仪 崔 (上海交通大学)
        Slides
      • 10:15
        基于气体时间投影室寻找无中微子双贝塔衰变的本底信号鉴别的研究 15m
        1) 无中微子双贝塔衰变的物理意义和气体时间投影室探测器的介绍; 2) 针对不同能量分辨率和读出平面精度的本底和信号的模拟; 3) 径迹重建方法KFB的介绍,包括数据预处理、卡尔曼建模和滤波方法、拓扑特征提取; 4) 事件鉴别效率和对实验灵敏度的分析。
        Speaker: 涛 李 (Sun Yat-Sen (Zhongshan) University)
        Slides
    • 08:30 10:10
      Parallel Session I:TeV and BSM Physics: (Chair: Jing Shu)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 08:50
        Pseudo-Nambu-Goldstone dark matter, first-order phase transitions, and gravitational waves 20m
        We investigate the potential stochastic gravitational waves from first-order electroweak phase transitions in a model with pseudo-Nambu-Goldstone dark matter and two Higgs doublets. The dark matter candidate can naturally evade direct detection bounds, and can achieve the observed relic abundance via the thermal mechanism. Three scalar fields in the model obtain vacuum expectation values, related to phase transitions at the early Universe. We search for the parameter points that can cause first-order phase transitions, taking into account the existed experimental constraints. The resulting gravitational wave spectra are further evaluated. Some parameter points are found to induce strong gravitational wave signals, which have the opportunity to be detected in future space-based interferometer experiments LISA, Taiji, and TianQin.
        Speaker: Zhao-Huan Yu (Sun Yat-Sen University)
        Slides
      • 09:10
        Light sneutrino and neutralino as dark matter candidates in $U(1)_X$SSM 20m
        U(1)XSSM is the extension of the minimal supersymmetric standard model (MSSM) and its local gauge group is SU(3)C X SU(2)L X U(1)Y X U(1)X. To obtain this model, three singlet new Higgs superfields and right-handed neutrinos are added to MSSM. In the framework of U(1)XSSM, we study the lightest CP-even sneutrino and neutralino as cold dark matter candidates. The relic density and the cross section for dark matter scattering off nucleon are both researched. In suitable parameter space of the model, the numerical results satisfy the constraints of the relic density and the cross section with the nucleon.
        Speaker: Prof. Shu Min Zhao (Hebei University)
        Slides
      • 09:30
        ForwArd Search ExpeRiment at the LHC 20m
        FASER is a proposed small and inexpensive experiment designed to search for light, weakly-interacting particles during Run 3 of the LHC from 2021–23. Such particles may be produced in large numbers along the beam collision axis, travel for hundreds of meters without interacting, and then decay to standard model particles. To search for such events, FASER will be located 480 m downstream of the ATLAS IP in the unused service tunnel TI12 and be sensitive to particles that decay in a cylindrical volume with radius R = 10 cm and length L = 1.5 m. FASER will complement the LHC’s existing physics program, extending its discovery potential to a host of new, light particles, with potentially far-reaching implications for particle physics and cosmology. This report describes the technical details of the FASER detector components
        Speaker: 昊 逄 (清华大学)
        Slides
      • 09:50
        Affleck-Dine Leptogenesis from Higgs Inflation 20m
        I will present a simple extension of the Standard model to explain the origin of inflation, baryon asymmetry and neutrino masses at the same time.
        Speaker: 成成 韩 (中山大学)
    • 08:30 10:20
      Parallel Session V:Particle Detector Technology
      Convener: Prof. Yangheng Zheng (University of Chinese Academy of Sciences)
      • 08:30
        Vertex and Energy Reconstruction in large-volume liquid scintillator detectors with Machine Learning Methods 20m
        Large-volume liquid scintillator detector with ultra-low background levels have been widely used to study neutrino physics and search for dark matter. The ability to accurately reconstruct particle interaction events is of great importance for the success of the experiment. The signal collected by PMTs is used for estimation of the vertex and the energy of neutrino and background particle interactions. In this work we present several machine learning approaches applied to the vertex and the energy reconstruction. Multiple models and architectures were compared and studied, including Boosted Decision Trees (BDT), Deep Neural Networks (DNN), a few kinds of Convolution Neural Networks (CNN), based on ResNet and VGG, and a Graph Neural Network based on DeepSphere. The models of BDT and DNN are trained with aggregated information, pre-calculated from PMT signal, while the others are trained with PMT-wise measured information from PMTs.
        Speaker: Mr Zhen Qian (Sun Yat-sen University)
        Slides
      • 08:50
        Position reconstruction for the PandaX-4T experiment 15m
        When incoming particle hits the xenon atoms in the PandaX dual-phase xenon detector, the ionized electrons drift upward and get amplified under electric fields, yielding a secondary scintillation signal (S2). The S2 signal is then collected by PMT arrays at the top of the detector, which keeps the position information of the original scattering event. In the data analysis, position reconstruction plays an important role in terms of energy resolution and background suppression etc. In this work we develop three types of position reconstruction algorithms for the PandaX-4T experiment based on 169 PMTs at the top of the detector, including template matching(TM), photon acceptance function(PAF), neutral network(NN). We use these algorithms to reconstruct S2 signals' horizontal position, and evaluate the corresponding resolution and precision based on the 83mKr calibration data, wall events data, BiPo events data and neutron calibration data during the PandaX-4T detector commissioning.
        Speaker: 琳慧 顾 (Shanghai Jiao Tong University)
      • 09:05
        Data processing and simulation in PandaX-4T 15m
        PandaX-4T is a multi-purpose detector employing the liquid xenon technology. It can be used to study the dark matter, solar neutrinos, supernova neutrinos as well as the neutrinoless double beta decay of Xe136. The detector has nearly 500 readout channels, each digitizing data at the sampling rate of 250 MHz. The output data rate of the detector when taking the background data is about 30-40 MB/s, and that can reach about 300 MB/s when taking calibration data. Selected data will be processed on site to produce data quality plots. All the data will be transferred to the processing center in Chengdu through high speed special network connection and be processed there. Specially designed data structure based on the high speed I/O library enables the fully reconstruction of physical quantities from one raw data file to be finished in 2-3 mintues. I will talk about the details of the data structure and processing in PandaX-4T. Data simulation in PandaX-4T will also be discussed, by emphasizing the specially designed BambooMC program based on Geant4.
        Speaker: Dr 勋 谌 (Shanghai Jiao Tong University)
        Slides
      • 09:20
        Detector geometry management system designed for Super Tau Charm Facility offline software 15m
        A geometry management system (GMS) is designed for the Offline Software of Super Tau Charm Facility (STCF) in China. Based on the eXtensible Markup Language (XML) and Detector Description Toolkit for High Energy Physics Experiments (DD4Hep), the system provides a consistent detector-geometry description for different offline applications, such as simulation, reconstruction and visualization. It is being used for detector optimization and performance evaluation with a customized full detector simulation package (FullSim). The paper presents the design, implementation, and performance of the GMS.
        Speaker: He Li (University of Science and Technology of China)
        Slides
      • 09:35
        SAGE:针对基于高纯锗探测器实验的蒙卡模拟和波形模拟软件包 15m
        SAGE(Simulation and Analysis for Germanium Experiments)软件包是一款为CDEX合作组设计开发,用于对基于高纯锗探测器的暗物质探测、无中微子双贝塔衰变等稀有事例搜寻实验中的本底源项和探测器响应进行模拟与分析的模拟框架。SAGE的本底模拟部分主要基于Geant4,通过模块化的方式实现了可选择、可组合、可调整的几何结构、源项设置、物理列表和输出格式,用户可以通过一定格式的配置文件对以上模块进行设置。SAGE的几何模块主要针对未来CDEX暗物质实验(CDEX-χ)和无中微子双贝塔衰变实验(CDEX-v)进行探测器阵列、低温恒温器、实验大厅及岩洞等结构的建模,并基于此开展未来实验的本底水平与本底模型研究。SAGE的波形模拟部分主要是针对未来CDEX实验中会使用的p型点电极高纯锗和宽能型高纯锗探测器,模拟其对电离辐射的波形响应,同时实现了对p型高纯锗探测器表面死层中沉积能量事例的波形的计算,并基于此开展波形分析方法的研究。
        Speaker: 文翰 代 (清华大学工程物理系)
        Slides
      • 09:50
        Crystal bolometer output raw data process with optimal filter assisted 15m
        Luminescent bolometric technique is a promising approach to detect extremely rare events in particle physics (such as neutrino-less double beta decay and dark matter), as it has low detection threshold, unparalleled energy resolution and unique particle discrimination. The output raw data of bolometer is a continuous stream binary file, which was obtained via sampling the electronics readout signal with a certain sampling frequency in no-trigger mode. In this paper, we developed a data processing program based on optimal filter to further reduce the noise contribution, and a new trigger algorithm was applied to effectively extract signal events.
        Speaker: Kangkang Zhao (University of Science and Technology of China)
        Slides
      • 10:05
        RPC Upgrade for ATLAS Phase-II 15m
        ATLAS Phase-II upgrade will start approximately in 2023. Chinese cluster (USTC-SDU-SJTU) has been playing an important role in the Phase-II RPC production task. A laboratory for producing, testing and improving new type of RPC is constructed. The RPC to be adopted in the Phase-II upgrade is based on the 1mm gas gap of BIS7/8 upgrade. The simulation and measurement of this type of RPC have been performed. Prototypes have also been successfully built recently. Dedicated study on the key parameters of the prototypes is performed. The details will be shown in this talk.
        Speaker: Jun Guo (S)
        Slides
    • 10:30 10:40
      Coffee Break 10m
    • 10:40 12:00
      Parallel Session III:Heavy Ion Physics: EIC (Chair: 肖博文)
      Conveners: Guang-You Qin (Central China Normal University) , Prof. Qinghua Xu (Shandong University) , Prof. Zebo Tang (University of Science and Technology of China) , huangm@ihep.ac.cn (高能所)
      • 10:40
        STAR实验核子自旋结构新进展 25m
        Speaker: 挺 林
        Slides
      • 11:05
        Collectivity arising from interference in small and large systems with HBT suppressions 15m
        Speaker: 芃 茹
        Slides
      • 11:20
        Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions 15m
        Speaker: Liang Zheng
      • 11:35
        Multiple parton scattering and gluon saturation in dijet production at EIC 15m
        Speaker: Yuanyuan Zhang (Central China Normal University)
    • 10:40 12:00
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 10:40
        Isospin Symmetry of Fragmentation Functions 20m
        In this talk, we present a systematic study of the isospin symmetry of fragmentation functions by taking decay contributions into account. We show that in the unpolarized case the isospin symmetry is held for fragmentation functions of Λ and only tiny violations are allowed for other hadrons due to the contributions from weak decays. We present a rough estimate of the magnitudes of such violations. In the polarized case, we show that the isospin symmetry violation for Λ production should be tiny and the recent Belle data on the transverse polarization of Λ can be reproduced if the isospin symmetry is kept in the corresponding polarized fragmentation functions.
        Speakers: Kai-bao Chen (Shandong Jianzhu University) , Shu-yi Wei (ECT) , Yu-kun Song (University of Jinan) , Zuo-tang Liang (Shandong University)
      • 11:00
        Semi-inclusive decay of heavy quarkonium hybrids into quarkonium in the EFT framework 20m
        In order to understand the nature of the XYZ particles, theoretical predictions of the various decay modes of the XYZ measured by experiments are essential. In this work, we focus on the decay of heavy quarkonium hybrids. We study semi-inclusive decays of heavy quarkonium hybrids into traditional quarkonium in the EFT framework. We found that our numerical results of the decay rates are different from previous studies. We also develop a calculation framework in which the theoretical uncertainty can be systematically improved.
        Speaker: Dr Wai Kin Lai (South China Normal University)
        Slides
      • 11:20
        A simple prescription for covariant chiral effective theories 20m
        A simple prescription for calculating the loop corrections in covariant chiral effective theories for baryons is described and demontrated with some simple one-loop diagrams for both SU(2) and SU(3) cases.
        Speaker: Ji-Feng Yang (East China Normal University)
        Slides
      • 11:40
        Transverse Lambda hyperon polarization at lepton colliders 20m
        We study transverse polarization of Λ hyperons in single-inclusive leptonic annihilation. We show that when the transverse momentum of the Λ baryon is measured with respect to the thrust axis, a transverse momentum dependent factorization formalism is required and the polarization is generated by the TMD polarizing fragmentation function (TMD PFF). However, when the transverse momentum of the Λ baryon is measured with respect to the momentum of the initial leptons, a collinear twist-3 formalism is required and the polarization is generated by the intrinsic collinear twist-3 fragmentation function DT. Using the TMD formalism, we demonstrate that the Λ polarization at OPAL and Belle can be described using the twist-2 TMD factorization formalism. Finally, we make a theoretical prediction for this polarization in the collinear twist-3 formalism at Belle.
        Speaker: Prof. 鼎煜 邵 (复旦大学)
        Slides
    • 10:40 11:55
      Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology
      Conveners: Dr Liangjian Wen (高能所) , Dr Min Min Zha (高能所) , Dr Zhe Wang (Tsinghua University) , Prof. Zong-Kuan GUO (ITP-CAS)
      • 10:40
        PandaX实验寻找136-氙双贝塔衰变(NL)DBD-ES 15m
        $^{136}Xe$双beta衰变背景介绍 PandaX实验寻找(NL)DBD-ES PandaX-III(NL)DBD-ES蒙特卡洛模拟 PandaX-III(NL)DBD-ES粒子径迹拓扑特征分析 PandaX-4T(NL)DBD_ES蒙特卡洛模拟 结论与展望
        Speaker: Lingyin Luo (school of physics Peking Uniersity)
      • 10:55
        基于CDEX-10实验的暗光子动能混合参数限制 15m
        暗光子是一种可能的暗物质候选粒子,也可能是一种新的标准模型粒子与暗物质粒子相互作用的媒介子,对暗光子的理论和实验研究,有助于发现超越粒子物理标准模型的新物理,扩展人类对宇宙起源和演化的认识,在当前暗物质直接探测领域内受到广泛的关注。基于中国暗物质实验组CDEX-10实验的两个极低阈值极低本底的高纯锗探测器,本文采用了最小化卡方值的统计方法计算了CDEX-10实验分别对太阳暗光子和暗光子暗物质的动能混合参数κ的限制结果.基于C10-B1探测器(分析阈值为160 eV)的205.4公斤天的测量数据,给出了轻质量的太阳暗光子动能混合参数在90%置信度下的上限值,并在10到300电子伏特区间上得到了国际上最好的直接探测实验结果;利用C10-B1的205.4公斤天和C10-C1的244.2公斤天的数据对暗光子暗物质的动能混合参数κ进行了联合分析,给出了其在0.1~4.0 keV质量区间内90%置信度下的上限值,为暗光子的相关理论研究提供了重要的实验支撑.
        Speaker: 泽 佘 (Tsinghua University)
        Slides
      • 11:10
        Search for Light Dark Matter–Electron Scattering in the PandaX-II Experiment 15m
        We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector with a total 46.9 tonnes·day exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from the data. 1821 candidates are identified within an ionization signal range between 50 and 75 photoelectrons, corresponding to a mean electronic recoil energy from 0.08 to 0.15 keV. The 90 % C.L. exclusion limit on the scattering cross section between the dark matter and electron is calculated with systematic uncertainties properly taken into account. Under the assumption of point interaction, we provide the world’s most stringent limit within the dark matter mass range from 15 to 30 MeV·c2, with the corresponding cross section from 2.5×10−37 to 3.1×10−38 cm2.
        Speaker: Mr Chen Cheng (Sun Yat-sen University)
        Slides
      • 11:25
        Search for dark matter in effective field theory model and cosmic ray boosted model with full PandaX-II exposure data 15m
        PandaX is a direct detection of DM experiment with a dual phase Xenon TPC. Constraintson the simplest EFT dark matter-nucleus spin-independent (SI) interaction with full exposuredata had been delivered recently. There are other DM models like EFT magnetic or electricdipole moment interactions and boosted scenario which produce quite different signal spectrafrom the simplest EFT SI model. They can have significant contribution on the high energy nu-clear recoils. In this work we extend the region of interest to 25keVee to optimize the sensitivityto these new models. The detector response to both nuclear and electron recoil in this regionare carefully studied with calibration data. All the background are re-evaluated in the extendedsignal region. No significant excess is found compared to background-only model in this newregion, and we conclude stronger constraints on the EFT models. We also give constrains oncross section of the cosmic ray boosted DM.
        Speaker: Ms Xuyang Ning (sjtu)
        Slides
      • 11:40
        Constraints on neutrino electromagnetic properties from COHERENT elastic neutrino-nucleus scattering 15m
        Neutrino electromagnetic properties are import windows in neutrino physics to go beyond the Standard Model. The coherent elastic neutrino-nucleus scattering process is a powerful probe of the neutrino electromagnetic properties, which was first observed in 2017 at the COHERENT experiment by the cesium-iodide (CsI) detector and later in 2020 at the argon (Ar) detector. In this talk, we present the constraints of neutrino electromagnetic properties from COHERENT CsI and Ar data, including the neutrino charge radii, millicharges and magnetic moments. The combined CsI and Ar limits are also obtained, and compared with other experimental results. We show that the COHERENT data can provide competitive constraints of the neutrino charge radii, in particular for the muon neutrino related components.
        Speaker: ZHANG Yiyu
        Slides
    • 10:40 12:00
      Parallel Session I:TeV and BSM Physics: (Chair: Shengjian Chen)
      Conveners: Haijun Yang (Shanghai Jiao Tong University) , Prof. Qiang Li (School of physics, Peking University) , Prof. Zongguo Si (ShanDong University) , 昊 ZHANG (Institute of High Energy Physics, Chinese Academy of Sciences)
      • 10:40
        费米缪子反常磁矩实验 20m
        费米实验室的缪子g-2实验对缪子的反常磁矩进行了精确的测量,首批物理结果现已公布。最新的实验结果表明缪子反常磁矩的理论预言与实验测量之间存在4.2σ的偏差,为新物理的存在提供了强有力的证据,预示着世界上可能存在新的未知粒子或者作用力。 缪子反常磁矩由两个角频率的精确测量确定。实验中,缪子受强磁场束缚在储存环内运动,通过统计缪子衰变产生的高能电子数目得到缪子的反常进动频率ω_a。利用脉冲核磁共振技术,测量质子的自旋进动频率ω_p表征强磁场的大小。结合上述两个频率以及缪子在储存环中的分布函数和其他已知常数可以精确的测量缪子的反常磁矩。首批物理结果的测量精度达到了0.46ppm,后继测量结果的精度将进一步提高,预计于2022年发布。
        Speaker: 柄志 李 (Shanghai Jiao Tong University)
        Slides
      • 11:00
        Search for the cLFV by muon to electron conversion:COMET and Mu2e 20m
        In the Standard Model, Flavor-changing-neutral-current (FCNC) in quark sector is predicted at loop level. In the lepton sector, the lepton-flavor-violation (LFV) was evident after the discovery of neutrino oscillation. In the SM, even considering the tiny masses and oscillation of neutrinos, the predicted decay rate for charged-lepton-flavor-violation (cLFV), such as muon-electron conversion, is still tiny (less than 10^-54), which can not be detected in experiment. However, New Physics contributions can enhance the muon-electron conversion rate, and lead to observable signal. The COMET experiment and Mu2e experiment are proposed to search for the muon-electron conversion with the sensitivity improved by the order of 4 magnitudes comparing to the current upper limit. Any experimental evidence of cLFV will indicate signal of New Physics.
        Speaker: Ms Yao Zhang (Institute of high energy physics, Beijing China)
        Slides
      • 11:20
        Progress of Muonium to Antimuonium Conversion Experiment (MACE) at EMuS 20m
        The spontaneous muonium-to-antimuonium conversion is one of the interesting charged lepton flavor violation processes. MACE is the next generation experiment to probe such a phenomenon. In models with a triplet Higgs to generate neutrino masses, such as Type-II seesaw and its variant, this process can be induced by the doubly-charged Higgs contained in these models. We study the prospect of MACE to probe these models via the muonium-to-antimuonium transitions. After considering the limits from $\mu^+ \rightarrow e^+ \gamma $ and $\mu^+ \rightarrow e^+ e^- e^+$, we find that MACE could probe a parameter space for the doubly-charged Higgs which is beyond the reach of LHC and other flavor experiments. Meanwhile, some progress in experimental study will be presented, including the plan of Chinese accelerator muon source called EMuS based on CSNS, our thoughts to increase muonium production efficiency, a development of toy MC simulation tool, optimization of magnetic spectrometer design.
        Speaker: Jian Tang (Sun Yat-Sen University)
        Slides
      • 11:40
        散裂中子源上的实验型缪子源装置 20m
        中国散裂中子源(CSNS)通过散裂反应技术,为我国材料科学技术、物理、化学化工、生命科学、资源环境和新能源等提供一个先进、功能强大的科研平台。实验型缪子源装置(EMuS)将是CSNS束流扩展平台上的一个重要应用装置,利用CSNS提供的高功率质子束流,打靶产生高强度的缪子束流。EMuS利用多种类别的缪子束流可以开展轻子味道破坏实验、未来缪子物理实验的技术研究、中微子物理等工作。 根据上述物理目标,EMuS开展了相关靶站,束线和探测器的设计工作。EMuS分别利用CSNS一期5 kW和二期25 kW的质子束流,打碳靶产生高强度的缪子束流。为获得比传统缪子源“薄靶+侧向收集”方案更高的粒子产额,EMuS采用“厚靶+超导螺线管前向收集”的方案进行次级粒子的收集,从而得到更高的缪子流强。作为一个提供多种缪子束流的缪子源装置,EMuS的设计面临众多挑战。 本报告将会从靶站、质子束线、缪子束线和探测器等几个方面,介绍EMuS设计及其难点。同时介绍EMuS在不同粒子物理领域的应用前景。
        Speaker: Guang Zhao (IHEP)
        Slides
    • 10:40 12:00
      Parallel Session V:Particle Detector Technology
      Convener: Yong Yang (Shanghai Jiao Tong University)
      • 10:40
        Ge-76 0νββ实验中的单点/多点事例甄别方法研究 20m
        高纯锗探测器技术是0νββ实验研究中的代表性探测技术。0νββ末态的两个电子在锗晶体内射程很短,可以认为是“单点事例”。相反,环境本底事例则多为“多点事例”,因此可以通过单点/多点事例甄别去除多点事例从而压低本底。本工作基于BEGe和PPCGe两种类型高纯锗探测器,使用电流最大值参数A和沉积能量E的比值A/E作为甄别参数,开展了单点/多点事例甄别方法研究,取得了显著的降低本底的效果,并利用放射源刻度数据对甄别效率进行了检验。
        Speaker: bt zhang (清华大学)
        Slides
      • 11:00
        Radioactivity measurement of high precise U and Th in different materials using ICP-MS 15m
        In order to screen the materials for low background detectors for Jiangmen Underground Neutrino Observatory (JUNO) and future double-beta decay experiments, the natural radioactivity of some related materials requires measurement to sub-ppt level. The inductively coupled plasma mass spectroscopy(ICP-MS) is dedicated used to measure the materials with ultra-low radioactivity due to its high sensitivity to trace amounts of 238U and 232Th.   In this talk, we will introduce the precise measurement of U/Th in different materials using ICP-MS. We have successfully measured the U/Th in acrylic to sub-ppt level by vaporizing, and the method detection limit (MDL) at 99% confidence level can reach 0.04/0.09 ppt for 238U/232Th in acrylic. A co-precipitation approach to determine the sub-ppt level of Th and U in copper is developed using ICP-MS with the MDL reaching ~0.1 ppt 238U in copper. The methods for other materials such as PI、SiO2、Teflon and PFA etc will also be introduced in this talk.
        Speaker: 李院霞 LI Yuanxia (高能所)
        Slides
      • 11:15
        高纯锗暗物质实验CDEX-50dm中的本底模拟与控制方案 15m
        继CDEX-1,CDEX-10以后,CDEX合作组正在建设50公斤级的高纯锗阵列实验系统(CDEX-50dm)用于轻质量暗物质直接探测。CDEX-50dm将由PPCGe和BEGe天然锗探测器组成,本底控制在0.01cpkkd@1keV水平,物理目标是WIMP自旋无关灵敏度达到10^-44 cm^2水平。针对CDEX-50dm的本底控制目标,详细模拟了高纯锗探测器从原料处理、制备、运输和探测器研制等各个环节的本底控制,建立了探测器生产标准流程。建立了CDEX-50dm探测器本底模型,并给出本底优化控制方案。
        Speaker: 新平 耿 (清华大学)
      • 11:30
        用于极低放射性材料筛选的带电粒子谱仪的研发 15m
        极低本底材料的筛选对于稀有事列的探测(如暗物质直接探测,无中微子双贝塔衰变)极为重要,材料本底已经成为限制其灵敏度的关键因素之一。我们设计了一款带电粒子谱仪,主要用于测量材料表面放射性。谱仪的核心是一个低本底,高精度,有效测量面积约2000 cm2的气体时间投影室(TPC)。 TPC采用Micromegas 探测器作为读出平面,具有同时测量粒子能量与径迹的功能。利用气体TPC 独特的径迹重建功能,我们可以很好的辨别粒子来源,从而进一步压低本底,提高谱仪的灵敏度。本次报告将主要报告谱仪的概念设计及其原型探测器的初步测试。
        Speaker: Mrs Haiyan Du (sjtu)
      • 11:45
        Pile-up reconstruction in liquid scintillator detectors using general statistical aproach 15m
        Liquid scintillator detectors play an important role in neutrino experiments, for its low threshold and high resolution in energy measurements. Traditionally they are treated as event calorimeters, which is not enough for high precision measurements. Low energy neutrino events may pile-up with radioactive background such as ${}^{14}$C, smearing the energy spectrum if pile-ups are treated as one. In this presentation we will introduce a general, extensible statistical reconstruction method for dual point source. By constructing a more precise detector response model and applying Bayesian analysis with suitable approximation, it can extract all information from PMT waveforms. Since it contains no black-box compared to deep learning algorithms, the results have clear statistical meaning and reliability.
        Speaker: 益阳 武 (Tsinghua University)
        Slides
    • 14:00 15:45
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 14:00
        Light hyperon physics at BESIII 15m
        The BESIII experiment at the electron positron collider BEPCII in Beijing is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world’s largest data samples at the J/ψandψ(2S)  resonances. The recent observations of hyperon polarizations at BESIII, which opens a new window for searching new physics beyond the SM, also attracts both experimental and theoretical attentions. In this presentation recent results on hyperon physics achieved at BESIII will be highlighted.
        Speaker: Yuyao Ji (高能所)
      • 14:15
        Study of phi(2170) at BESIII 15m
        In e+e- collisions between 2 and 3 GeV, excited states of rho, omega and phi can be produced directly. Especially the resonances around 2GeV like rho(2000), rho(2150) and \phi(2170) are not fully understood yet. Theorists describe the phi(2170) as a traditional s s-bar state, an s s-bar g hybrid, a tetraquark state, a Lambda Lambda-bar bound state, or a phi KK resonance. The predicted decay widths vary strongly depending on the assumed nature of phi(2170). With energy scan data collected by the BESIII collaboration between 2.0 GeV and 3.08 GeV, the properties of phi(2170) are studied systematically in PWAs of its expected decay modes, such as e+e- -> K+K-pi0pi0, phi eta', phi eta, K+K-, and eta' pi+pi-.
        Speaker: Mr Yateng Zhang (ZZU)
        Slides
      • 14:30
        Decays studies of charmonium states at BESIII 15m
        With 448 M psi(2S) events collected with the BESIII detector, many decay studies of charmonium states blow open-charm threshold have been performed. In this talk, some recent progresses will be presented. It will include an observation of the decays chi_cJ -> n Ks anti-Lambda + c.c., measurement of the inclusive branching fraction for psi(2S) -> Ks + anything, measurements of the branching fractions of psi(3686) -> anti-Sigma0 Lambda + c.c. and chi_cJ (J=0,1,2) -> Lambda anti-Lambda.
        Speaker: Gang Yu
        Slides
      • 14:45
        Remarks on the composite nature of the light scalar meson f0(980) 15m
        This paper studies two main partial decay channels f0(980) → KK and f0(980) → ππ by imposing saturation of compositeness relationship and decay width formula. Referring to the pole parameter of f0(980) comes from dispersive analysis, we calculate a series of partial decay widths and coupling coefficients for each channel. Then the values of the branching ratio help predict the compositeness coefficient for each channel.
        Speaker: Mr ZEQIANG WANG (北京师范大学)
        Slides
      • 15:00
        The fully-heavy tetra-quark system interact via the Pomeron exchange 15m
        The inner dynamics for the fully-heavy quark system is a hot topic. The LHCb Collaboration reported the observation of a tetra-quark candidate X(6900) with a configuration of cccc in the di-J/ψ invariant mass spectrum. We show that the narrow structure X(6900) can be produced via the Pomeron exchange and coupled-channel effects between the jpsi-jpsi、jpsi-psi(2S) scatterings.
        Speaker: Dr Chang Gong (IHEP)
      • 15:15
        Study of light axial-vector meson spectra 15m
        We present a systematic study of light axial vector mesons. We find that the Open $K^*\bar{K}$ threshold effect and the resulting triangle singularity are crutial for understanding their decay behaviors.
        Speaker: Mr Mengchuan Du (Institute of High Energy Physics, Chinese Academy of Sciences)
        Slides
      • 15:30
        X atom 15m
        The $X(3872)$, whose mass coincides with the $D^0\bar D^{*0}$ threshold, is the most extended hadron object. Since its discovery in 2003, debates have never stopped regarding its internal structure. We propose a new object, the X atom, which is the $D^\pm D^{*\mp}$ composite system with positive charge parity and a mass of $(3879.89\pm0.07)$~MeV, formed mainly due to the Coulomb force. We show that a null signal of the X atom can be used to put a lower limit on the binding energy of the $X(3872)$. From the current knowledge of the $X(3872)$ properties, the production rate for the X atom relative to the $X(3872)$ in $B$ decays and at hadron colliders should be at least $1\times10^{-3}$. New insights into the $X(3872)$ will be obtained through studying the X atom.
        Speaker: zhenhua zhang (Institute of Theretical Physics)
        Slides
    • 15:55 17:40
      Parallel Session II:Hadron and Flavor Physics
      Conveners: Prof. Beijiang LIU (高能所) , Dr Feng-Kun Guo (ITP, CAS) , Prof. Zhenwei Yang (Peiking University, Beijing, China) , Prof. 翔 刘 (兰州大学)
      • 15:55
        Search for invisible decays and J/psi weak decay at BESIII 15m
        BESIII has collected 448 M $\psi(3686)$ events and 10 B $J/\psi$ events. The huge data sample provide an excellent chance to search for new physics. We report the search for the decay $J/\psi\to\gamma + invisible$, which is predicted by next-to-minimal supersymmetric model. Without significant signal found, we gave about 6 times better upper limits than previous CLEO-c’s results. We also search for the J/psi rare weak decay to $\bar D^0\pi^0, \bar D^0 \eta, \bar D^0 \rho^0, D^-\pi^+, D^-\rho^+$ and $D^-e^+\nu_e +c.c.$, and present the most stringent constraints of $10^{-6}$ at 90\% confidence level. We also report the preliminary result of the first search for the invisible decay of $\Lambda$, which is predicted by the mirror matter model and could explain the $4\sigma$ discrepancy in neutron lifetime measurement between beam method and bottle method.
        Speaker: Ziyuan LI (Sun Yat-Sen University)
        Slides
      • 16:10
        Feasibility study of measuring b->s $\gamma$ photon polarization in D^0 -> K_1(1270)^- e^+ nu_e at STCF 15m
        We report a sensitive study of measuring b→sγ photon polarisation in D0→K1(1270)−e+νe with an integrated luminosity of L= 1 ab−1 at a center-of-mass energy of 3.773 GeV at future Super Tau Charm Facility. More than 61,000 signals of D0→K1(1270)−e+νe are expected. Based on a fast simulation software package, the statistical sensitivity for the ratio of up-down asymmetry is estimated to be 1.5×10−2 by performing a two-dimensional angular analysis in D0→K1(1270)−e+νe. Combining with measurements of up-down asymmetry in B→K1γ, the photon polarisation in b→sγ can be determined model-independently.
        Speaker: 玉兰 范 (Wuhan University)
        Slides
      • 16:25
        Un-binned Angular Analysis of B→D*lv and the Right-handed Current 15m
        In this article, we perform a sensitivity study of an un-binned angular analysis of the $B\to D^{*}\ell \nu_{\ell}$ decay, including the contributions from the right-handed current. We show that the angular observable can constrain very strongly the right-handed current without the intervention of the yet unsolved Vcb puzzle.
        Speaker: 儒英 唐 (中国科学院高能物理研究所)
        Slides
      • 16:40
        Charmed baryon $\Xi_c\to\Xi$ decays from lattice QCD 15m
        While the standard model is the most successfully theory to describe all interactions and constituents in elementary particle physics, it has been constantly examined for over four decades. Weak decays of charm quarks can measure the coupling strength of quarks in different families and serve as an ideal probe for CP violation. As the lowest charm-strange baryons with three different flavors, $\Xi_c$ baryons (made of $csu$ or $csd$) have been extensively studied in experiments at the large hadron collider and in electron-positron collision. However the lack of reliable knowledge in theory becomes the unavoidable obstacle in the way. In this work, we use the state-of-the-art Lattice QCD techniques, and generate 2+1 clover fermion ensembles with two lattice spacings, $a=(0.108{\rm fm},0.080{\rm fm})$. We then present the first {\it ab-initio} lattice QCD determination of form factors governing $\Xi_{c}\to \Xi \ell^+\nu_{\ell}$, analogous with the notable $\beta$-decay of nuclei. Our theoretical results for decay widths are consistent with and about two times more precise than the latest measurements by ALICE and Belle collaborations. Together with experimental measurements, we independently determine the quark-mixing matrix element $|V_{cs}|$, which is found in good agreement with other determinations.
        Speaker: Dr Fei Huang (Shanghai JiaoTong University)
        Slides
      • 16:55
        Lattice QCD calculations of TMD soft function through large-momentum effective theory 15m
        The transverse-momentum-dependent (TMD) soft function is a key ingredient in QCD factorization of Drell-Yan and other processes with relatively small transverse momentum. We present a lattice QCD study of this function at moderately large rapidity on a 2+1 flavor CLS dynamic ensemble with a = 0.098 fm. We extract the rapidity-independent (or intrinsic) part of the soft function through a large-momentum-transfer pseudo-scalar meson form factor and its quasi-TMD wave function using leading-order factorization in large-momentum effective theory. We also investigate the rapidity-dependent part of the soft function—the Collins-Soper evolution kernel—based on the large-momentum evolution of the quasi-TMD wave function.
        Speaker: 其安 张 (Shanghai Jiao Tong University)
        Slides
      • 17:10
        Propagator generation with Chroma+QUDA for various fermion actions 15m
        We will present how to calculate propagators on Chroma with overlap and HISQ (highly improved staggered quark) valence quark, which are not fully supported on Chroma before. For overlap, we setup the fermion action based on polynomials of hwilson action, create overlap dslash on QUDA, migrate Arnoldi algorithm from gwu-code to solve the eigensystem for deflation, and migrate multishift algorithm to calculate propagators with different mass. For HISQ, we write an interface between Chroma and QUDA to put the inversion on GPU and accelerate the calculation. The multigrid algorithm is also used for the HISQ inversion.
        Speaker: Mr 宽 张 (中国科学院理论物理所)
        Slides
      • 17:25
        Hamiltonian effective field theory in elongated or moving finite volume 15m
        We extend previous work concerning rest-frame partial-wave mixing in Hamiltonian effective field theory to both elongated and moving systems, where two particles are in a periodic elongated cube or have nonzero total momentum, respectively. We also consider the combination of the two systems when directions of the elongation and the moving momentum are aligned. This extension should also be applicable in any Hamiltonian formalism. As a demonstration, we analyze lattice QCD results for the spectrum of an isospin-2 $\pi\pi$ scattering system and determine the $s$, $d$, and $g$ partial-wave scattering information. The inclusion of lattice simulation results from moving frames significantly improves the uncertainty in the scattering information.
        Speaker: Yan Li (University of Chinese Academy of Sciences)
        Slides
    • 08:30 10:15
      Plenary SessionⅠ M层-锦华宫

      M层-锦华宫

      Convener: Prof. Bingsong ZOU (ITP, CAS)
      • 08:30
        吕晓睿:强子物理实验研究进展 35m
        Speaker: Prof. Xiao-Rui Lyu (University of Chinese Academy of Sciences)
        Slides
      • 09:05
        杨一玻:格点QCD研究进展 35m
        Speaker: Yi-Bo Yang (ITP/CAS)
        Slides
      • 09:40
        王 倩:强子物理理论研究进展 35m
        Speaker: Qian Wang
        Slides
    • 10:15 10:25
      Coffee Break 10m
    • 10:25 12:10
      Plenary Session II M层-锦华宫

      M层-锦华宫

      Convener: Prof. 作堂 梁 (Shandong University)
      • 10:25
        何 苗:中微子物理实验研究进展 35m
        Speaker: Dr Miao He (IHEP)
        Slides
      • 11:00
        晁 伟:中微子物理理论 35m
        Speaker: 伟 晁 (Beijing Normal University)
        Slides
      • 11:35
        张一飞:高能重离子碰撞物理 35m
        Speaker: Prof. Yifei Zhang (University of Science and Technology of China)
        Slides
    • 12:10 14:00
      Lunch 1h 50m
    • 14:00 15:45
      Plenary Session Ⅲ
      Convener: Prof. Qing-Hong Cao (Peking University)
      • 14:00
        庄胥爱:TeV物理实验进展 35m
        Speaker: Dr 庄胥爱 ZHUANG Xuai (高能所)
        Slides
      • 14:35
        高 俊:高能量前沿微扰QCD进展 35m
        Speaker: Jun Gao (Shanghai Jiao Tong University)
        Slides
      • 15:10
        王建春:探测器综述 35m
        Speaker: Jianchun Wang (IHEP)
        Slides
    • 15:45 15:55
      Coffee Break 10m
    • 15:55 17:35
      Plenary Session Ⅳ: 大会暨期刊介绍、晨光杯颁奖等 M层-锦华宫

      M层-锦华宫

      Convener: Prof. Qiang ZHAO (Institute of High Energy Physics, Chinese Academy of Sciences)