Dr
Yayun He
(South China Normal University)
16/08/2021, 14:00
Hongjie MU
(Tsinghua University)
16/08/2021, 14:00
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.
Xu-Guang Huang
(Fudan University)
16/08/2021, 14:00
Mr
Yang Liu
(IHEP)
16/08/2021, 14:00
Searches for strong production of supersymmetric particles with the ATLAS detector
健润 胡
(高能所)
16/08/2021, 14:15
Dr
Da Xu
(IHEP, Beijing)
16/08/2021, 14:15
Searches for electroweak production of supersymmetric particles with the ATLAS detector
Houbing Jiang
(Shandong University)
16/08/2021, 14:20
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...
实 浦
16/08/2021, 14:25
昌樵 李
(Shanghai Jiao Tong University)
16/08/2021, 14:30
Hengying Zhang
(Shandong University)
16/08/2021, 14:30
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...
Dr
Binbin Yan
(postdoctor)
16/08/2021, 14:35
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...
Yunxuan Song
(Peking University , University of Chinese Academy of Sciences)
16/08/2021, 14:35
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-...
Yufeng Wang
(Shanghai Jiao Tong University)
16/08/2021, 14:45
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...
Dr
Wei-Tian Deng
(HuaZhong University of Science and Technology (HUST))
16/08/2021, 14:50
Dr
Ma lishuang
(IHEP)
16/08/2021, 14:50
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。
Prof.
Jianbin Jiao
(Shandong University)
16/08/2021, 14:55
Recent results from Belle will be reviewed
Dr
Quanbu Gou
(Institute of High Energy Physics, CAS)
16/08/2021, 15:00
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...
yue xu
(Tsinghua University)
16/08/2021, 15:00
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 -...
Baochi Fu
(Peking University)
16/08/2021, 15:05
Ms
Xiaomei LI Xiaomei
(高能所)
16/08/2021, 15:05
Mr
Ning Cao
(Institute of High Energy Physics, Chinese Academy of Sciences)
16/08/2021, 15:15
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.
Peng Liu
(Shanghai Institute of Applied Physics, Chinese Academy of Sciences)
16/08/2021, 15:15
Dr
Shoushan Zhang
(Institute of High Energy Physics)
16/08/2021, 15:15
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，...
晓丽 罗
(Shandong University)
16/08/2021, 15:20
Mr
Xin Wang
(1. Xinjiang Astronomical Observatories, CAS)
16/08/2021, 15:30
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)...
Yuming MA
(Institute of high energy physics)
16/08/2021, 15:30
Bo Liu
(IHEP)
16/08/2021, 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
魏明华
16/08/2021, 15:35
Dr
Zhou Wang
(Shanghai Jiao Tong University)
16/08/2021, 15:35
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)...
蒋 艺
(University of Chinese Academy of Sciences)
16/08/2021, 15:45
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....
Liqing QIN
(高能所)
16/08/2021, 15:45
安平 黄
(清华大学)
16/08/2021, 15:50
Mr
任明杰 李
(四川大学)
16/08/2021, 15:50
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。
Mr
祖豪 李
(高能所粒子天体)
16/08/2021, 16:10
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。
Dr
kan chen
(Peking university)
16/08/2021, 16:10
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...
Shanshan Cao,
Shanshan Cao
(Shandong University)
16/08/2021, 16:10
Dr
Lei Xia
(University of Science and Technology of China)
16/08/2021, 16:10
旭东 吕
(北京大学)
,
旭东 吕
(Peking University)
16/08/2021, 16:10
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...
Dr
Li Zhao
(Shanghai JiaoTong University)
16/08/2021, 16:10
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...
Dr
丽桃 杨
(Tsinghua University)
16/08/2021, 16:25
mingming xia
(Tsinghua University)
16/08/2021, 16:25
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...
Dr
志成 唐
(高能所)
16/08/2021, 16:30
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。
Mr
Xiang-Kun Dong
(ITP,CAS)
16/08/2021, 16:30
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...
Pengyao Cui
(Central China Normal University)
16/08/2021, 16:35
Dr
Yang Zhang
(Zhengzhou University)
16/08/2021, 16:40
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...
Junhao YIN
(高能所)
16/08/2021, 16:40
Tan Luo
(Central China Normal University)
16/08/2021, 16:50
Mr
Hongrong Qi
(Tsinghua University)
16/08/2021, 16:50
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.
Prof.
Xiaoping Wang
(Beihang University)
16/08/2021, 16:55
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...
Mr
Yateng Zhang
(ZZU)
16/08/2021, 16:55
Nihar Sahoo
(Shandong University)
16/08/2021, 17:05
智 杨
(电子科技大学)
16/08/2021, 17:10
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.
Prof.
Yu Zhang
(Anhui University)
16/08/2021, 17:10
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。
来富 罗
(University of Science and Technology of China)
16/08/2021, 17:15
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...
Dr
兆民 王
(山东高等技术研究院)
16/08/2021, 17:15
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。
柯 米
(Central China Normal University)
16/08/2021, 17:20
Jia Liu
(Peking University)
16/08/2021, 17:25
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...
志宏 沈
(Peking University)
16/08/2021, 17:30
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.
HAN Yubo
(IHEP)
, Dr
Hongbo ZHU
(IHEP)
16/08/2021, 17:30
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...
Dr
Yayun He
(South China Normal University)
16/08/2021, 17:35
Dr
Zetong Sun
(IHEP)
16/08/2021, 17:45
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。
Wenbin Zhao
(school of physics Peking Uniersity)
16/08/2021, 17:50
Bo Fang
(Wuhan University)
16/08/2021, 17:50
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.
Mr
朝义 渠
(山东高等技术研究院)
16/08/2021, 18:00
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...
Zhong Yang
16/08/2021, 18:05
Changqiao LI
(Shanghai Jiao Tong U.)
17/08/2021, 08:30
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...
Prof.
Heng-Tong Ding
(Central China Normal University)
17/08/2021, 08:30
Dr
Fangcheng HE
(Institute for Theoretical Physics, CAS)
17/08/2021, 08:30
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.
伟伟 许
(Shandong University)
17/08/2021, 08:30
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。
Dr
Tong Su
(Shandong Institute of Advanced Technology)
17/08/2021, 08:45
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。
RenQi Pan
(Zhejiang University)
17/08/2021, 08:50
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...
Mr
Dianjun Zhao
(Institute of Theoretical Physics，Chinese Academy of Sciences)
17/08/2021, 08:50
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...
相雷 朱
17/08/2021, 08:55
Mr
Ren-qiang Zhang
(IHEP)
17/08/2021, 09:10
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 $3068$...
Xiao Yang
(University of Science and Technology of China)
17/08/2021, 09:20
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...
Ms
Ruiqin Wang
(Qufu Normal Univercity)
,
瑞芹 王
17/08/2021, 09:20
Fa Peng Huang
(Sun Yat-Sen (Zhongshan) University)
17/08/2021, 09:30
We study new approaches to explore light dark matter by radio telescope (SKA,Fast) based on the resonant conversion effects.
Jin Wang
(IHEP)
17/08/2021, 09:30
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
治明 李,
治明 李
(华中师范大学粒子物理研究所)
17/08/2021, 09:35
Dr
Yu Meng
(CHEP, Peking University)
17/08/2021, 09:50
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...
Jian Wang
(Shandong University)
17/08/2021, 09:50
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...
Yingjie Zhou
(Central China Normal University)
17/08/2021, 09:50
昶达 何
(上海交通大学)
17/08/2021, 09:50
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。
...
Mr
传阳(Chuan-Yang) 邢(Xing)
(北京大学(Peking University))
17/08/2021, 10:00
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.
Dr
Jing Dong
(CAS-IHEP)
, Dr
Yunpeng LU
(Institute of High Energy Physics, CAS)
17/08/2021, 10:05
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...
善进 吴
17/08/2021, 10:05
Bao-Dong Sun
(Shandong University, QingDao)
17/08/2021, 10:10
Trace anomaly contribution to hydrogen atom mass
Mr
Sheng-Tai Li
(CCNU)
17/08/2021, 10:20
Dr
Yunpeng LU
(Institute of High Energy Physics, CAS)
17/08/2021, 10:40
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...
Dr
Yun-Long Zhang
(National Astronomical Observatories, Chinese Academy of Sciences(NAOC))
17/08/2021, 10:40
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...
Prof.
驰 杨
(Shandong University)
17/08/2021, 10:40
Jianhui Zhang
(Beijing Normal University)
17/08/2021, 10:40
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.
Mr
Youkai Wang
(Shaanxi Normal University)
17/08/2021, 10:40
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。
Dr
Ruilin Zhu
(Nanjing Normal University)
17/08/2021, 11:00
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...
Dr
Ligong（立功） Bian（边）
(Chongqing University(重庆大学))
17/08/2021, 11:00
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。
王妹 查
17/08/2021, 11:05
Kun LIU
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
17/08/2021, 11:10
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...
Dr
Yang ZHOU
(Institute of High Energy Physics, CAS)
17/08/2021, 11:15
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。
Dr
Jun Hua
(Shanghai Jiao Tong University)
17/08/2021, 11:20
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...
Prof.
Bo-Qiang Ma
(Peking University)
17/08/2021, 11:20
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...
Prof.
Haifeng Li
(Shandong University)
17/08/2021, 11:25
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...
Jian Zhou
17/08/2021, 11:30
旻寰 楚
(Shanghai Jiao Tong University)
17/08/2021, 11:40
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,...
Prof.
Huaqiao ZHANG
(IHEP)
17/08/2021, 11:40
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...
Prof.
Shuang-Yong Zhou
(USTC)
17/08/2021, 11:40
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...
Wen-Jing Xing
17/08/2021, 11:45
Dr
Jie ZHANG
(Institute of High Energy Physics)
, Mr
Wei WEI
(高能所)
17/08/2021, 11:45
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...
Prof.
peng sun
(NJNU)
17/08/2021, 11:55
I will talk about Lattice ensembles generation with Clover actions.
Shu Lin
(Sun Yat-Sen University)
17/08/2021, 14:00
Baoyi Chen
(Tianjin University)
, Mrs
liu jiang
(Tianjin University)
17/08/2021, 14:00
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...
Prof.
Yi Wang
(THU)
17/08/2021, 14:00
“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。
Prof.
Yuming Wang
(Nankai University)
17/08/2021, 14:00
I will discuss the recent theory development on exclusive B-meson decays.
柯 米
(Central China Normal University)
17/08/2021, 14:12
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)...
Ying An
(Peking University)
17/08/2021, 14:15
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...
Dr
Sheng-Sen Sun
(Institute of High Energy Physics)
, Dr
Yong Liu
(Institute of High Energy Physics)
17/08/2021, 14:20
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...
Dr
Qin Qin
(华中科技大学(HUST))
17/08/2021, 14:20
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.
Mr
Abdusalam Abdukerim
(Shanghai Jiao Tong University)
17/08/2021, 14:22
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...
Qiye Shou
(Fudan University)
17/08/2021, 14:25
Dr
Peng Ru
(South China Normal University)
17/08/2021, 14:26
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...
Dr
HuaXing Zhu
(Zhejiang University)
17/08/2021, 14:30
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.
峰磊 刘
(Central China Normal University)
17/08/2021, 14:30
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...
Dacheng Xu
(Tsinghua University)
17/08/2021, 14:32
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...
Prof.
Huaqiao ZHANG
(IHEP)
17/08/2021, 14:35
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...
Prof.
Xiaomei Li
(China Institute of Atomic Energy)
17/08/2021, 14:36
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。
Kaifeng Shen
(University of Science and Technology of China)
17/08/2021, 14:38
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...
Mingrui Zhao
(China Institute of Atomic Energy)
17/08/2021, 14:40
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...
Peicheng Jiang
(Peking Uniersity)
17/08/2021, 14:40
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...
仁杰 王
(University of Science and Technology of China)
17/08/2021, 14:42
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...
Shi Pu
(University of Science and Technology of China)
,
聪 易
(USTC)
17/08/2021, 14:44
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...
meng lu
(Peking University)
17/08/2021, 14:45
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...
Prof.
Xun Xue
(East China Normal University)
17/08/2021, 14:45
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.
Shi-Zheng Yang
17/08/2021, 14:50
Dr
Peihong Gu
(Southeast University)
17/08/2021, 15:00
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...
Xingbo Zhao
(Institute of Modern Physics, Chinese Academy of Sciences)
17/08/2021, 15:00
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...
Baoyi Chen
(Tianjin University)
17/08/2021, 15:05
Mr
Zhang Di
(IHEP, CAS)
17/08/2021, 15:15
4. 中微子物理、粒子天体物理与宇宙学
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...
Lei Li
(Beijing Institute of Petro-chemical Technology)
17/08/2021, 15:20
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...
Prof.
Hideki Okawa
(Fudan University)
17/08/2021, 15:20
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)
17/08/2021, 15:40
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...
Hui Liu
(Central China Normal University)
17/08/2021, 15:40
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...
Xiaoming Zhang
(Central China Normal University)
17/08/2021, 15:40
静舒 李
(Sun Yat-Sen (Zhongshan) University)
17/08/2021, 15:42
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...
Dr
Feng Wang
(Institute of High Energy Physics)
17/08/2021, 15:52
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...
Ms
Yang He
(Shandong University)
17/08/2021, 15:56
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。
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)
17/08/2021, 16:00
\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...
Mr
Xuantao Ji
(南华大学)
17/08/2021, 16:00
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。
Mustafa Anaam
(PHD student)
17/08/2021, 16:04
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...
Xiaozhi Bai
(University of Science and Technology of China)
17/08/2021, 16:05
Yi-Lei Tang
(中山大学)
17/08/2021, 16:10
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.
明萱 薛
(University of Science and Technology of China)
17/08/2021, 16:15
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。
Mr
Fan Si
(University of Science and Technology of China)
17/08/2021, 16:18
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...
Qian Yang, Dr
Qian Yang
(Shandong University)
,
Qian Yang
(Shandong University)
17/08/2021, 16:20
崔涵,
涵 崔
(University of Chinese Academy of Sciences)
17/08/2021, 16:24
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...
Mr
Lin Zhao
(Department of Engineering Physics, Tsinghua University)
17/08/2021, 16:25
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...
Danning Liu
(Shanghai Jiao Tong University)
17/08/2021, 16:26
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...
Jing Chen
(Shanghai Jiao Tong University)
17/08/2021, 16:28
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...
Mr
Qibin Liu
(Shanghai Jiaotong University)
,
Qibin Liu
(TDLI., Shanghai JiaoTong University)
17/08/2021, 16:30
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...
Dr
群刚 文
(安徽大学)
17/08/2021, 16:30
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。
Tianqi Hu
(Shanghai Jiao Tong University)
17/08/2021, 16:32
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...
Xinyue Ju
17/08/2021, 16:35
Guang Zhao
(IHEP)
, Dr
Sheng-Sen Sun
(Institute of High Energy Physics)
,
ZHAO Guang
(高能所)
17/08/2021, 16:35
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....
Hanqing Liu
(Shanghai Jiao Tong University)
17/08/2021, 16:36
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...
cheng chen
(Shanghai Jiao Tong University)
17/08/2021, 16:38
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...
Zhen Wang
(Shanghai Jiao Tong University)
17/08/2021, 16:40
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.
Wentai Luo
(University of Chinese Academy of Sciences)
17/08/2021, 16:40
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...
ZHANG Jiawei
17/08/2021, 16:42
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。
Dr
Yu Wang
(State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China)
17/08/2021, 16:45
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...
mingming xia
(Tsinghua University)
17/08/2021, 16:46
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...
Xiaolong CHEN
17/08/2021, 16:50
野 田
(Institute of Modern Physics, Chinese Academy of Sciences)
17/08/2021, 16:50
Status of the R&D and physics prospects of EicC and will be discussed.
Dr
Tao LIN
(IHEP)
17/08/2021, 16:55
Progress of the new software framework for future Higgs factories
Xiaorong Zhou
(University of Science and Technology of China)
17/08/2021, 17:05
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...
Yongbo Huang
(Guangxi University)
17/08/2021, 17:15
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...
Weiran Xu
(Massachusetts Institute of Technology)
18/08/2021, 08:30
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...
Lailin Xu
(University of Science and Technology of China)
18/08/2021, 08:30
Recent Dark Matter search results from the ATLAS experiment using pp collision data at the LHC will be presented. The searches are performed in various well motivated theory frameworks, including simplified s-channel models, extended Higgs sectors and Higgs portal dark matter models. For each theory model, various experimental signatures are exploited, with or without missing energy, leading...
梳苏 施,
梳苏 施
(Central China Normal University)
18/08/2021, 08:30
Yixiong Zhou
(University of Chinese Academy of Sciences)
18/08/2021, 08:30
Recent results of doubly charmed baryons at LHCb will be reported in this talk.
Mr
Zhen Qian
(Sun Yat-sen University)
18/08/2021, 08:30
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...
Dr
丽桃 杨
(Tsinghua University)
18/08/2021, 08:45
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...
Shiyang Li
(Central China Normal University)
18/08/2021, 08:45
Recent results of beauty-charm baryons at LHCb will be reported in this talk.
琳慧 顾
(Shanghai Jiao Tong University)
18/08/2021, 08:50
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...
Zhao-Huan Yu
(Sun Yat-Sen University)
18/08/2021, 08:50
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,...
Dr
勋 谌
(Shanghai Jiao Tong University)
18/08/2021, 09:05
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...
Prof.
Shu Min Zhao
(Hebei University)
18/08/2021, 09:10
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...
Hao Ma
(Tsinghua University)
18/08/2021, 09:15
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。
258.
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)
力 严
18/08/2021, 09:20
He Li
(University of Science and Technology of China)
18/08/2021, 09:20
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....
Dr
Xiaoshuai Qin
(Shandong University)
18/08/2021, 09:40
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...
Mr
仲智 刘
(清华大学)
18/08/2021, 09:45
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。
Ze-fang Jiang
18/08/2021, 09:45
成成 韩
(中山大学)
18/08/2021, 09:50
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.
Kangkang Zhao
(University of Science and Technology of China)
18/08/2021, 09:50
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...
Dr
Lei Xia
(University of Science and Technology of China)
18/08/2021, 09:55
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...
Maowu Nie
(Shandong University)
18/08/2021, 10:00
维平 王
(University of Science and Technology of China)
18/08/2021, 10:10
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...
Mingrui Zhao
18/08/2021, 10:15
涛 李
(Sun Yat-Sen (Zhongshan) University)
18/08/2021, 10:15
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。
bt zhang
(清华大学)
18/08/2021, 10:40
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。
Kai-bao Chen
(Shandong Jianzhu University)
,
Shu-yi Wei
(ECT)
,
Yu-kun Song
(University of Jinan)
,
Zuo-tang Liang
(Shandong University)
18/08/2021, 10:40
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...
Lingyin Luo
(school of physics Peking Uniersity)
18/08/2021, 10:40
$^{136}Xe$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
柄志 李
(Shanghai Jiao Tong University)
18/08/2021, 10:40
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。
泽 佘
(Tsinghua University)
18/08/2021, 10:55
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...
Ms
Yao Zhang
(Institute of high energy physics, Beijing China)
18/08/2021, 11:00
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,...
Dr
Wai Kin Lai
(South China Normal University)
18/08/2021, 11:00
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...
芃 茹
18/08/2021, 11:05
Mr
Chen Cheng
(Sun Yat-sen University)
18/08/2021, 11:10
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,...
新平 耿
(清华大学)
18/08/2021, 11:15
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。
Ji-Feng Yang
(East China Normal University)
18/08/2021, 11:20
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.
Liang Zheng
18/08/2021, 11:20
Jian Tang
(Sun Yat-Sen University)
18/08/2021, 11:20
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...
Mrs
Haiyan Du
(sjtu)
18/08/2021, 11:30
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。
Yuanyuan Zhang
(Central China Normal University)
18/08/2021, 11:35
Guang Zhao
(IHEP)
18/08/2021, 11:40
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...
益阳 武
(Tsinghua University)
18/08/2021, 11:45
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...
Mr
Mengchuan Du
(Institute of High Energy Physics, Chinese Academy of Sciences)
18/08/2021, 15:15
Oral report
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.
zhenhua zhang
(Institute of Theretical Physics)
18/08/2021, 15:30
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...
Ziyuan LI
(Sun Yat-Sen University)
18/08/2021, 15:55
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...
儒英 唐
(中国科学院高能物理研究所)
18/08/2021, 16:25
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.
Dr
Fei Huang
(Shanghai JiaoTong University)
18/08/2021, 16:40
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...
其安 张
(Shanghai Jiao Tong University)
18/08/2021, 16:55
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...
Yan Li
(University of Chinese Academy of Sciences)
18/08/2021, 17:25
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...
Prof.
Xiao-Rui Lyu
(University of Chinese Academy of Sciences)
19/08/2021, 08:30
Prof.
Yifei Zhang
(University of Science and Technology of China)
19/08/2021, 11:35
Prof.
Qiang ZHAO
(Institute of High Energy Physics, Chinese Academy of Sciences)
19/08/2021, 15:55
Prof.
Yuanning Gao
(Peking University)
19/08/2021, 16:40
Dr
Qian Yang
(Shandong University)
3. 重离子物理
Oral report
The suppression of $J/\psi$ production caused by the color-screening effect in heavy-ion collisions is considered as an evidence of the creation of quark-gluon plasma. To interpret the observed suppression in heavy-ion collisions, a good understanding of its production mechanism in p+p collisions is needed. However, the production of $J/\psi$ in hadronic collisions remains not fully...
Shu Lin
(Sun Yat-Sen University)
3. 重离子物理
Oral report
We derive axial kinetic equations for QED plasma based on Kadanoff-Baym equation. Elastic scatterings such as Coulomb and Compton scatterings are described through self-energy and vertex corrections. We also discuss inelastic scatterings and its role in spin dynamics. The resulting axial kinetic equations provide a consistent framework for the spin dynamics at leading order in coupling.
Prof.
Heng-Tong Ding
(Central China Normal University)
3. 重离子物理
Oral report
We introduce novel relations between the derivatives ($\partial^n \rho/\partial m_l^n$) of the
Dirac eigenvalue spectrum ($\rho$) with respect to the light sea quark mass ($m_l$)
and the $(n+1)$-point correlations among the eigenvalues ($\lambda$) of the massless
Dirac operator. Using these relations we present lattice QCD results for
$\partial^n \rho/\partial m_l^n$ ($n=1, 2, 3$)...
anping huang
(Tsinghua University)
3. 重离子物理
Oral report
Gauge fields provide the fundamental interactions in the Standard Model of particle physics. Gauge field configurations with nontrivial topological windings are known to play crucial roles in many important phenomena, from matter-anti-matter asymmetry of today's universe to the permanent quark confinement. Their presence is however elusive for direct detection in experiments. Here we show that...
Dr
Lei Wu
(Nanjing Normal University)
1. TeV物理和超出标准模型新物理
Oral report
I will talk about the possible connections of DM with muon g-2 in particle physics and Hubble tension in cosmology, and also the prospects of searching for such DM particles at the LHC.
钊焕 余
(Sun Yat-Sen University)
1. TeV物理和超出标准模型新物理
Oral report
We explore the Dirac fermionic and complex scalar dark matter in the framework of a hidden $\mathrm{U(1)_X}$ gauge theory with kinetic mixing between the $\mathrm{U(1)_X}$ and $\mathrm{U(1)_Y}$ gauge fields. The $\mathrm{U(1)_X}$ gauge symmetry is spontaneously broken due to a hidden Higgs field. The kinetic mixing provides a portal between dark matter and standard model particles. Besides, an...
Dr
Wei-Tian Deng
(HuaZhong University of Science and Technology (HUST))
3. 重离子物理
Oral report
High energy heavy ion collisions could be simulated by AMPT model. Employing a smearing function on parton in QGP, one can get the energy-momentum tensor at any field point. Then the evolution of QGP could be calculated, including its temperature field, velocity field, and vorticity field.
However, the velocity of smearing function is assumed as infinity in past calculation, which is...
Dr
Sheng-Tai Li
(CCNU)
3. 重离子物理
Oral report
We study the second-order fluctuations of and correlations among net baryon number, electric
charge and strangeness in (2+1)-flavor QCD at non-zero magnetic field. We perform the lattice simulations using the tree-level improved gauge action and the highly improved staggered quark (HISQ) action with a fixed scale approach ($a\simeq$ 0.117 fm). The strange quark mass is fixed to its...
Ms
Wen-Jing Xing
(Central China Normal University)
3. 重离子物理
Oral report
While perturbative QCD can explain the color, mass and energy dependences of parton energy loss and jet quenching at large transverse momentum ($p_T > 6-8$ GeV) in heavy-ion collisions [1], a simultaneous description of heavy flavor suppression factor $R_{AA}$ and $v_2$ still remains a challenge at low and intermediate $p_T$ due to non-perturbative effects. In this work [2], we solve this...
Dr
Liang Zheng
(China University of Geosciences (Wuhan))
3. 重离子物理
Oral report
The striking resemblance of high multiplicity proton-proton (pp) collisions at the LHC to heavy ion collisions challenges our conventional wisdom on the formation of the Quark-Gluon Plasma (QGP). A consistent explanation of the collectivity phenomena in pp will help us to understand the mechanism that leads to the QGP-like signals in small systems. In this study, we introduce a transport model...
Dr
Yayun He
(South China Normal University)
3. 重离子物理
Oral report
Jet energy loss and transverse momentum broadening are caused by the interactions of jets with the quark-gluon plasma (QGP) in heavy-ion collisions. We employ the state-of-art Bayesian analysis to extract the jet energy loss distributions for single inclusive jets and gamma-triggered jets at $\sqrt{s}$ = 2.76 TeV and 5.02 TeV from experiments at the Large Hadron Collider (LHC). The extracted...
Ms
Yingjie Zhou
(Central China Normal University)
3. 重离子物理
Oral report
Particle production and anisotropic flow measurements have been used to investigate the properties of the QCD matter produced in heavy ion collisions. The RHIC Beam Energy Scan program covers a wide range of energies, including the transition from a partonic dominated area to hadronic dominated area. Of particular interest is the high baryon density region which is accessible through...
Jian Zhou
(University of Science and Technology of China)
3. 重离子物理
Oral report
Recently, significant enhancements of $e^{+}e^{-}$ pairs at very low transverse momentum ($p_{T}$) were observed by the STAR collaboration in peripheral Au+Au collisions. The excess can be explained by photon-photon interactions induced by the extremely strong electromagnetic field produced by the fast-moving heavy ions. While such photon-photon interactions were traditionally studied in...
Mr
Xinyue Ju
(University of Science and Technology of China)
3. 重离子物理
Oral report
We present the STAR measurement of $D^±$ meson production at midrapidity (|y| < 1) in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. $D^±$ mesons were reconstructed from the three-body decay channel $D^±$ -> $K^∓$ $π±$ $π^±$ utilizing STAR's Heavy Flavor Tracker for topological reconstruction. The $D^±$ invariant spectra at midrapidity were obtained in various centrality classes covering a...
Dr
Xiaozhi Bai
(University of Science and Technology of China)
3. 重离子物理
Oral report
Heavy quarks are an excellent probe to study the strongly interacting quark-gluon plasma (QGP) created in high-energy heavy-ion collisions. They are mainly produced via initial hard partonic scattering processes and thus experience the entire evolution of the QGP medium. For $J/\psi$, a bound state of charm quarks, a strong suppression was seen in central collisions at the SPS and RHIC...
Yuanyuan Zhang
(Central China Normal University)
3. 重离子物理
Oral report
Large angle gluon radiations induced by multiple parton scatterings contribute to dijet production
in deeply inelastic scattering off a large nucleus at the Electron-Ion Collider. Within the generalized
high-twist approach to multiple parton scattering, such contributions at the leading order in perturbative QCD and large Bjorken momentum fraction $x_B$ can be expressed as a convolution of...
Ms
晓丽 罗
(Shandong University)
3. 重离子物理
Oral report
We derive the covariant chiral kinetic equation in a background of non-Abelian gauge field $SU(N)$ in
the Wigner function formalism. We find that the color singlet phase-space distribution function and multiplet ones are totally coupled with each other.
These phase-space distribution functions have non-trivial Lorentz transformation rules when we define them in different reference...
Dr
wu shanjin
(CHEP, PKU)
3. 重离子物理
Oral report
This talk focus on the light nuclei production within the framework of coalescence model. By implementation of the characteristic function of the spatial density distribution function of the phase space density, we derive the yield of light nuclei in terms of various orders of cumulants for the spatial density distribution function. We found that the leading terms of the spatial cumulants in...
Hongxi Xing
(South China Normal University)
3. 重离子物理
Oral report
We present a systematic quantum algorithm, which integrates both the hadronic state preparation and the evaluation of the real-time light-front correlations, to study the parton distribution functions (PDFs). As a proof-of-concept, we realize the first direct simulation of the PDFs in the 1+1 dimensional Nambu-Jona-Lasinio (NJL) model. We show the results obtained by numerical diagonalization...
Prof.
Nihar Sahoo
(Shandong University)
3. 重离子物理
Oral report
Jet is produced in the early stage of heavy-ion and nucleon-nucleon collisions from hard-scattered patrons of the incoming beams. The property of hot-dense QCD matter, known as Quark-Gluon Plasma (QGP), can be inferred by studying the modified jet properties in heavy-ion collisions with respect to nucleon-nucleon collisions. Besides, we can investigate the QCD parton shower in vacuum by...
Mr
Xiaolong Chen
(University of Science and Technology of China)
3. 重离子物理
Oral report
Heavy flavor quarks ($c$, $b$) are produced dominantly by the interactions of the initial incoming partons, and thus experience the entire evolution of the hot and dense medium created in high-energy nuclear collisions. Therefore, charm and bottom quarks are considered as an excellent probe to study the properties of the Quark-Gluon Plasma (QGP). In this talk, we will report recent STAR...
梳苏 施
(Central China Normal University)
3. 重离子物理
Oral report
报告将汇报RHIC-STAR重离子碰撞实验中近年来重要的集体流研究进展。主要包括RHIC能量扫描计划BES-I和固定靶3 GeV重离子碰撞中集体流的结果，其中金金碰撞3 GeV是最新测量结果。我们发现在3 GeV的碰撞中，强子相占主导地位。同时我们将展望未来能量扫描实验的计划以及集体流的研究重点。
Shi-zheng Yang
(shandong university)
3. 重离子物理
Oral report
In this talk, I will mainly present the second order non-dissipative transport coefficients derived from the Wigner equation for massless spin-1/2 charged fermions in global equilibrium. The Wigner function can be solved order by order in the power expansion of the vorticity and electromagnetic field. The Wigner function is derived up to second order form which the non-dissipative charge...
Baochi Fu
(Peking University)
3. 重离子物理
Oral report
The measurement of spin polarization in heavy-ion collisions provide new insight into the properties of hot and dense QCD matter. We study the spin polarization generated by fluid gradients based on data-calibrated hydrodynamic simulations. In additional to the widely studied thermal vorticity effects, we identify an undiscovered contribution from the fluid shear. The expression of the...
Prof.
Hideki Okawa
(Fudan University)
3. 重离子物理
Oral report
The sPHENIX detector at Relativistic Heavy Ion Collider (RHIC) is designed to further study the microscopic nature of the quark-gluon plasma (QGP) and nucleons through precision measurements of jets, Upsilons and open heavy flavor probes over a broad pT range. It is scheduled to start the operation in 2023, using state-of-the-art detector technologies to fully exploit the highest RHIC...
Shi Pu
(University of Science and Technology of China)
3. 重离子物理
Oral report
We discuss a puzzle in relativistic spin hydrodynamics; in the previous formulation the spin source from the antisymmetric part of the canonical energy-momentum tensor (EMT) is crucial. The Belinfante improved EMT is pseudo-gauge transformed from the canonical EMT and is usually a physically sensible choice especially when gauge fields are coupled as in magnetohydrodynamics, but the...
Pengyao Cui
(Central China Normal University)
3. 重离子物理
Oral report
Recent ALICE results on the yield of (multi-)strange particles in pp and p--Pb collisions reveal the possibility that similar strange quark production mechanisms could be present in all collision systems.
The $p_{\rm T}$-dependent baryon-to-meson yield ratio in hadronic and nuclear collisions is sensitive to the collective expansion of the system, the partonic recombination into hadrons, the...
Mingrui Zhao
(China Institute of Atomic Energy)
3. 重离子物理
Oral report
Anisotropic flow phenomena is a key probe of the existence of Quark-Gluon Plasma. The second and the third order anisotropic flow, V2 and V3 , are mostly determined by the corresponding initial spatial anisotropy coefficients, e2 and e3 , in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefcient, higher order anisotropic ow, Vn (n > 3),...
Maowu Nie
(Shandong University)
3. 重离子物理
Oral report
The main goal in heavy-ion collisions is to study the properties of hot-dense QCD medium, known as Quark-Gluon Plasma (QGP). Jets and collective phenomena have led to further understanding of the properties of QGP. Due to the interplay of rapidity symmetric binary collision profile, initially tilted bulk geometry and energy loss mechanism inside the QGP, jets may experience a non-zero...
Junjie Cao
(Henan Normal University)
1. TeV物理和超出标准模型新物理
Oral report
I will briefly discuss the implications of recent experimental results, such as direct dark matter detection experiments and muon g-2 measurement, on SUSY. These results provide useful hints for model construction.
Baoyi Chen
(Tianjin University)
3. 重离子物理
Oral report
Heavy ion collisions have provided an unique opportunity to study the nature of X(3872) compared with the electron-positron and proton-proton(anti-proton) collisions. Abundant charm quarks are produced in the early stage of heavy ion collisions. Their dynamical evolutions in the quark-gluon plasma can be described via the Langevin equation. We employ the Langevin+coalescence model to study the...
Prof.
Qiang ZHAO
(Institute of High Energy Physics, Chinese Academy of Sciences)
Dr
Ze-Fang Jiang
(HBEU/CCNU)
3. 重离子物理
Oral report
相对论流体力学是描述夸克胶子等离子体（QGP）时空演化及集体膨胀的重要理论工具。在1+1维纵向加速流体力学理论的基础上，一方面，我们给出1+1维纵向膨胀磁流体的多个解析解，发现初始强磁场的大小不同会影响QGP介质的热力学演化；另一方面，将1+1维纵向加速流体嵌入到1+3维时空中，我们给出了1阶Navier-Stokes及2阶Israel-Stewart近似下纵向加速膨胀流体的微扰解析解及数值解，并对比研究了解的相关性质。
直接流v1反映了QGP集体膨胀膨胀在纵向上的不对称行为。在光学Glauber模型的基础上，我们构建了一种纵向倾斜的介质结构来给出初始能量密度分布。然后通过CLVsic...
