第二十届全国中高能核物理大会暨第十四届全国中高能核物理专题研讨会

24 Apr 2025, 08:10 → 28 Apr 2025, 14:20 Asia/Shanghai

尊敬的专家和学者：

我们诚挚地通知您，由中国物理学会核物理分会中高能核物理专业委员会决定，第二十届全国中高能核物理大会暨第十四届全国中高能核物理专题研讨会定于2025年4月24日至28日在上海嘉定喜来登酒店举行。此次会议将由复旦大学承办，为期五天。会议统一安排食宿，交通费和住宿费自理。

中高能核物理研究致力于深入探索物质在微观层次的组成及其性质。近几十年来，随着国内外众多中高能实验设施（如北京正负电子对撞机BEPC、兰州冷却储存环CSR、惠州强流重离子加速器HIAF，以及欧洲核子研究中心LHC、美国RHIC等）的发展与建设，加之未来大科学装置提案的持续有力推进，束流能量和亮度显著提升，实验上我们不断发现新粒子和新现象，为理论研究提供了重要的实验结果，同时理论上也取得了诸多突破性进展。本次大会旨在交流讨论国内外中高能核物理的最新研究成果，分享国际前沿动态和发展趋势，以期推动国内科研队伍在相关领域的合作交流与深入研究。

会议议题包括：强子谱和强子结构、核子结构、超核物理、中高能重离子碰撞物理、QCD相结构、核天体物理以及相关交叉研究等。我们诚邀您参会，共同为推动中高能核物理研究的发展贡献力量。

会议主办单位:

复旦大学、中国科学院大学、中国高等科学技术中心

会议相关事宜及注意事项：

1．会议时间：2025年4月24日至28日。4月24日（周四）下午会场报到，报到日自助晚餐在21:00结束

2．会场地点：上海嘉定喜来登酒店（上海市嘉定区菊园新区嘉唐公路66号），三楼主会场

3．会议网站：https://indico.ihep.ac.cn/event/23976/

4．会议注册费：教师（含博士后）2000元/人，学生1500元/人，家属800元/人，支持现场注册缴费

5．交通指南：详见会议手册（见本网站底部文件），包括接送机/站大巴时刻表(虹桥枢纽与会场之间)及自行前往路线等信息

6.   住宿安排：因会场酒店已满，请未成功预订的参会者及时自行安排住宿

7.   会议日程：详见会议手册（见本网站底部文件）或会议网站日程表

8.   关于海报：

• 海报尺寸：宽度80cm × 高度120cm。受条件限制，会议不提供打印服务

• 展示地点：会场酒店三楼主会场外序厅，展位安排详见会议手册（见本网站底部文件）。报到后即可粘贴，以便于会议期间交流，请使用会场提供的固定工具

• 正式展示时间：4月26日晚上20:00-21:00

• 优秀海报展示将被遴选为Flash报告，并颁发证书

9.   Flash报告：

• 报告时段：4月28日上午11:30-12:00

• 报告时长：1分钟/报告（不设提问环节）

• 报告要求：建议提前准备1张突出研究亮点的幻灯片

• 温馨提醒：将通过海报上的或提交账号对应的的邮件地址，通知优秀海报获得者，请注意留意邮件，预计在4月27日发布

专家顾问委员会（按姓氏拼音排序）：

陈列文（上海交大），郭冰（原子能院），黄焕中（复旦大学），刘峰（华中师大），李学潜（南开大学），刘玉鑫（北京大学），梁作堂（山东大学），马伯强（北京大学），马建平（理论所），马余刚（复旦大学），沈彭年（高能所），王恩科（华南师范大学），王群（中科大），王新年（华中师大），徐瑚珊（近物所），许怒（近物所），苑长征（高能所），张宗烨（高能所），赵强（高能所），赵政国（中科大），郑阳恒（国科大），朱世琳（北京大学），庄鹏飞（清华大学），邹冰松（清华大学）

组委会会议主席：

马余刚（复旦大学）

组织委员会（按姓氏拼音排序）：

陈金辉（复旦大学）

黄    梅（中国科学院大学）

黄旭光（复旦大学）

马国亮（复旦大学）

邵鼎煜  (复旦大学)

郑阳恒（中国科学院大学）

会务联系人：

郁雯婷（秘书），yuwenting@fudan.edu.cn， 13774297131

马国亮，glma@fudan.edu.cn，13816298642

孙开佳，kjsun@fudan.edu.cn，13472616605

张春健，chunjianzhang@fudan.edu.cn，18516036185

 

 

第二十届全国中高能核物理大会手册.pdf

Thursday, 24 April

12:00 → 21:00 上海嘉定喜来登酒店: 报到

Friday, 25 April

08:10 → 08:30 主会场: 领导致辞

08:30 → 10:00 主会场: 报告

Convener: Zhengguo Zhao (USTC)

08:30 Overview of STAR

Speaker: Qinghua Xu (Shandong University)

徐庆华-山东大学-Overview of STAR.pdf

09:00 Overview of ALICE

Speaker: Yaxian Mao (Central China Normal University)

YMao_中高能核物理大会_ALICE20250425v2.pdf

09:30 Overview of LHCb

Speaker: Jibo HE (UCAS)

20250425_LHCbReviews.pdf

10:00 → 10:30 合影+茶歇

10:30 → 12:00 主会场: 报告

Convener: Bingsong ZOU (ITP, CAS)

10:30 Recent developments in spin physics in heavy ion collisions

Speaker: 作堂 梁 (Shandong University)

4 梁作堂-QGP整体极化效应研究新进展.pdf

11:00 A Lattice QCD Journey: From Nucleon Electric Polarizabilities to Electroweak Pion Production off a Nucleon

Speaker: 旭 冯 (Peking University)

5 冯旭-北京大学-A Lattice QCD Journey.pptx

11:30 Physics at future EIC and EicC

Speaker: Hongxi Xing (South China Normal University)

邢宏喜-华南师大-physics at EIC and EicC.pdf

12:00 → 13:30 午餐

喜来登酒店一楼和二楼自助餐厅

13:30 → 15:00 主会场: 报告

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

13:30 Overview of BES III

Speaker: Xiaorong Zhou (University of Science and Technology of China)

周小蓉-中国科大-BESIIIoverview.pdf

14:00 Overview of Belle II

Speaker: Sen Jia (Southeast University)

Belle2_overview.pdf

14:30 Nuclear structure through heavy-ion collisions

Speaker: Chunjian Zhang (复旦大学)

张春健-复旦大学-Nuclear_Structure_through_heavyion_collisions.pdf

15:00 → 15:30 茶歇

15:30 → 17:00 主会场: 报告

Convener: Xin-Nian Wang (Central China Normal University)

15:30 QCD phase transitions under magnetic field and rotation

Speaker: Mei Huang (University of Chinese Academy of Sciences)

中高能核物理大会20250425-黄梅-Final.pdf

16:00 QCD临界点和相边界实验研究进展

Speaker: Xiaofeng Luo (Central China Normal University)

QCD临界点和相边界实验研究进展_final.pdf

16:30 Machine learning in HIC

Speaker: Kai Zhou

12 周凯-香港中文大学（深圳）-Machine Learning in High Energy Nuclear Physics.pdf

18:30 → 20:30 晚宴

上海嘉定喜来登酒店三楼主会场

Saturday, 26 April

08:15 → 10:00 分会场一: 实验进展

Convener: Jinhui Chen

08:15 CEE实验进展

Speaker: Yapeng Zhang (近代物理研究所)

1.Status of CEE-YapengZhang-Shanghai.pptx

08:40 中高能核物理实验通用探测器新型概念

在粒子物理与核物理领域，多数实验采用大型通用探测谱仪开展综合性物理研究，如BESIII、Belle-II、LHCb、STAR、ATLAS、CMS等。通用型探测器谱仪依托偏转磁场，利用径迹探测器、粒子鉴别探测器、量能器等，分层次测量末态粒子的动量、能量、飞行时间、能量损失等，进而重建末态粒子的位置、四动量信息。但是，末态粒子的极化并未测量，导致末态粒子的信息不完备，影响物理信息的更准确提取。本报告中，我们将提出包含末态核子极化测量功能的新型谱仪概念。对现有实验及未来大科学装置，利用该方法可以在不影响原有探测器性能的前提下，额外获取末态核子极化测量功能。通过末态核子极化的新自由度，将拓宽中高能核物理领域实验方向。

Speaker: Yutie Liang (Institute of Modern Physics, CAS)

Detector_concept_shanghai.pdf

09:00 The status of sPHENIX experiment at RHIC

sPHENIX started running in Spring 2023 at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. It performs unprecedentedly high-precision measurements in 200 GeV p+p and Au+Au collisions. Built around the excellent BaBar superconducting solenoid, the central detector consists of a silicon pixel vertexer adapted from the ALICE ITS-2 inner barrel design, a silicon strip detector with single event timing resolution, a compact TPC, a novel EM calorimetry, and layers of hadronic calorimetry located inside and outside of the magnet to measure the full jet energy. The plan is to use the combination of electromagnetic calorimetry, hermetic hadronic calorimetry, precision tracking, and the ability to record data at high rates without trigger bias to make precision measurements of Heavy Flavor and jets to probe the Quark Gluon Plasma (QGP) formed in heavy ion collisions. These measurements will have a kinematic reach that not only overlaps those performed at the LHC, but extends them into a new, low-pT regime. In the 2024 run, sPHENIX has completed full commissioning, collecting 100 billion unbiased p+p collisions and 107/pb sampled with rare triggers for physics measurements, as well as a small commissioning Au+Au dataset in anticipation of high-luminosity Au+Au running in Run-25. The sPHENIX physics program, its potential impact, and its recent run status will be discussed in this talk.

Speaker: Dr Weihu Ma (复旦大学)

The Status of sPHENIX Experiment at RHIC-v2.pptx

09:20 惠州强子谱仪(HHaS)

即将建成的强流重离子加速器装置HIAF可以提供几个GeV能量的质子和重离子束流，为广泛的物理研究提供了良好的机遇，包括寻找超出标准模型的新粒子、新相互作用，检验CP等基本对称性，寻找新（奇特）强子态、奇特双重子态、新（多奇异）超核，强子、超核性质的精确测量，核物质相边界和相变临界点的发现和定位，等等。我们计划在HIAF高能终端，建设一个由螺线管磁铁、硅像素径迹探测器、LGAD飞行时间探测器、切伦科夫光-闪烁光双读出电磁量能器构成的实验谱仪，实现大接受度、1MHz-100MHz的极高事例率、多种粒子鉴别能力和几十微米量级的高位置分辨能力，从而满足上述物理研究的需求，促进基于我国实验装置的中高能粒子物理与核物理研究发展。报告将介绍实验的概念设计和初步模拟结果等。

Speaker: Dr 浩 仇 (中国科学院近代物理研究所)

仇浩-近代物理所-惠州强子谱仪HHaS.pdf

09:40 ALICE Run 3 实验中 5.36 TeV 下 Pb–Pb 碰撞中带电喷注的喷注谱及其修正效应的测量与喷注 $v_2$ 的测量

This study presents the first measurement of inclusive charged-particle jet spectra in different centrality classes of Pb–Pb collisions, utilizing the high-statistics Run 3 data collected by ALICE. We analyze the nuclear modification factor ($R_{cp}$) and the azimuthal anisotropy ($v_2$) of jets. Jets, originating from the fragmentation of high-energy partons, traverse the quark-gluon plasma (QGP) in heavy-ion collisions, losing energy primarily through medium-induced gluon radiation and elastic scattering. These processes lead to modifications in jet yields and structure. Due to the geometric shape of the collision, partons emitted at different angles experience different path lengths within the QGP, resulting in an azimuthal anisotropy in jet energy loss, which is quantified by the second-order flow coefficient ($v_2$).

To quantify jet quenching effects, we measure jet $R_{cp}$, defined as the ratio of jet $p_{\rm{T}}$ spectra in central Pb–Pb collisions to those in peripheral Pb–Pb collisions and pp baselines. Additionally, we perform the first analysis of inclusive charged-particle jet $v_2$ in Pb–Pb collisions, leveraging ALICE's upgraded detectors to extend the measurement to lower $p_{\rm{T}}$. The study of low-$p_{\rm{T}}$ jets is particularly crucial for constraining theoretical models and understanding the mechanisms responsible for jet $v_2$ generation. Finally, our results will be compared with existing jet $v_2$ measurements, further probing the properties of the QGP and the path-length dependence of jet energy loss.

Speaker: YuBiao Wang

王宇飚-华中师范大学-Measurement of charged jet spectrum and v2 in Pb-Pb collisions at 5.36 TeV with ALICE.pdf

08:15 → 10:00 分会场三: 核子结构

Convener: Xianglei Zhu (Tsinghua University)

08:15 Nucleon three-dimensional spin structures

Speaker: Tianbo Liu (Shandong University)

20250426 Nucleon three-dimensional spin structures.pdf

08:40 质子结构测量与PDF global fitting

质子结构是物质结构研究和QCD整体研究的代表性方向。过去几十年间，在理论上建立了QCD improved parton model，对于高能标下质子反应给出了良好描述；在实验上利用各种DIS和Drell-Yan过程，整体测量了质子内各类夸克分布。然而，广泛使用的理论框架和经典实验测量手段并不能在质子内海夸克的产生机制、SU(2)/SU(3) flavor asymmetry、intrinsic heavy quark等重大学术前沿问题上给出明确答案。

报告作者及其团队在过去数年中，提出可以利用强子对撞时产生的种类丰富的不对称性，系统性测量质子内各种夸克分布的相对性质。与经典实验观测相比，这些不对称性所提供的质子结构信息是独特的，将大幅丰富质子结构的观测内容。本报告将总结高能标下(GeV以上量级)质子结构研究的历史和现状，并报告作者(及其团队)针对当前质子结构领域重大物理问题所提出的新的研究方案，以及在该方案下已经取得的一系列理论和实验测量结果。

Speaker: 思奇 杨 (University of Science and Technology of China)

2 杨思奇-中国科学技术大学-质子部分子分布与global analysis.pdf

09:00 RHIC上的电磁探针实验研究

双轻子和光子等电磁探针对于揭示夸克物质电磁、热辐射和手征特性等具有不可替代的优势，一直是RHIC上重要的实验探索手段，近年来取得了良好的研究进展。2017年，STAR实验证实了超子整体极化的理论预言，自旋极化在夸克物质研究中的作用愈发重要。2021年，UPC中等效光子线性极化的理论预言得到实验证实，极化光子作为新的电磁探针，其作用得到不断丰富。
本报告将以电磁探针的实验测量作为线索，总结RHIC上的电磁探针物理研究进展，包括通过双轻子和直生光子研究QGP特性、通过极化光子探索强磁场下基本物理过程和原子核结构等。同时，报告将讨论相关实验研究的未来机遇。

Speaker: 驰 杨 (Shandong University)

3 杨驰-RHIC上的电磁探针实验研究.pdf

09:20 Flavor dependence of Lambda polarized fragmentation functions

Sparked by measurements of the transverse polarization of $\Lambda$ by Belle, much efforts are devoted to the study of the polarized $\Lambda$ TMD fragmentation function (TMDFF) $D_{1T,q}^{\perp\Lambda}$. Several questions, such as the isospin symmetry and gluonic contributions, remain unsolved due to limited range of experimental data. Inspired by the upcoming measurements of $\Lambda$ transverse polarization in pp/pA/AA collisions, we develop a framework of global analysis of $D_{1T,q}^{\perp\Lambda}$ at NLO precision, with strigent controls over the uncertainties caused by the approximations in CS evolution. We perform a proof-of-principle calculations with the framework and refine our previous parametrizations on $D_{1T,q}^{\perp\Lambda}$.

Speaker: Yu-kun Song (University of Jinan)

宋玉坤-Flavor dependence of hyperon FFs.pdf

09:40 有限温度密度相对论性量子场论中单圈费曼积分的约化方法

关联函数和散射振幅包含微观相互作用的核心物理信息，是量子场论中连接理论框架和实验数据的桥梁。在微扰量子场论中，关联函数和散射振幅的标准计算方法是按照耦合常数微扰展开，进而逐阶计算费曼图。在圈图层次上的所有费曼图中，单圈费曼图通常对应着次领头阶的贡献，不仅具有不可或缺的重要性，而且为进一步研究多圈费曼图的微扰贡献提供必要的准备。计算单圈费曼积分的传统方式是，把表观上不同的单圈费曼积分作为彼此无关的对象，进行“逐一的”（one-by-one）计算。采取这种one-by-one方式计算单圈费曼积分，具有“（数量）少、（速度）慢、（质量）差、（成本）费”的缺点。Passarino-Veltman reduction（PVR）能够系统高效地计算相对论性量子场论中的单圈费曼积分，具有“（数量）多、（速度）快、（质量）好、（成本）省”的优点，适用于大规模的单圈费曼图计算。PVR的应用前提条件是体系具有洛伦兹对称性，然而洛伦兹对称性不仅要求相对论性能量-动量关系，而且要求零温度和零密度。在高能核物理、宇宙学、天体物理和凝聚态物理等领域，物理量依赖于有限温度、有限密度，而有限温度和有限密度不仅极大地增加单圈费曼积分的计算复杂程度，而且通过指定一个测量温度和密度的特殊惯性参考系破坏洛伦兹对称性，从而使得基于洛伦兹对称性的PVR不再适用。本报告将介绍能够高效地计算有限温度密度相对论性量子场论中单圈费曼积分的Generalized PVR及其在高能核物理中的应用和可能的推广。

Speaker: 浩然 张 (四川师范大学)

5 张浩然-有限温度密度相对论性量子场论中单圈费曼积分的约化方法.pdf

08:15 → 10:00 分会场二: 强子物理

Convener: Xing-Gang Wu (Chongqing University)

08:15 Nucleon-pair production near threshold at BESIII

Speaker: Guangshun Huang (University of Science and Technology of China)

NucleonProductionAtThreshold.pdf

08:40 Hyperon physics at BESIII

With the large datasets on e+e- annihilation at the J/Psi and Psi(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties of hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been observed in J/Psi or P(3686) to hyperon anti-hyperon.The decay parameters for the most common hadronic weak decay modes were measured. Due to the non-zero polarization, the parameters of hyperon and antihyperon decays could be determined independently of each other for the first time. Some hyperon rare decays, such as hyperon radiative week decays and semi-leptonic decays, are also investigated at BESIII, which are important to test the weak interaction theories. Furthermore, evidence for two excited Ω hyperons has also been reported recently.

Speaker: Tao Luo (Fudan University)

罗涛-复旦大学-Hyperon physics at BESIII.pdf

09:00 Medium-assisted enhancement of chi_c1( 3872 ) production from small to large colliding systems

Studies of exotic hadrons such as the $\chi_{c1}$ state provide crucial insights into the fundamental force governing the strong interaction dynamics, with an emerging frontier to investigate their production in high energy collisions where a partonic medium is present. The latest experimental measurements from the Large Hadron Collider show an intriguing evolution pattern of the $\chi_{c1}$-to-$\psi$⁡(2⁢𝑆) yield ratio from proton-proton collisions with increasing multiplicities toward proton-lead and lead-lead collisions. Here we propose a mechanism of medium-assisted enhancement for the $\chi_{c1}$ production, which competes with the more conventional absorption-induced suppression and results in a nonmonotonic trend from small to large colliding systems. Realistic simulations from this model offer a quantitative description of all available data. Predictions are made for the centrality dependence of this observable in PbPb collisions as well as for its system-size dependence from OO and ArAr to XeXe and PbPb collisions. In both cases, a nonmonotonic behavior emerges as the imprint of the competition between enhancement and suppression and can be readily tested by future data.

Speaker: 星雨 郭 (scnu)

郭星雨-华南师范大学-Medium.pdf

09:20 pion介子精细结构的微扰QCD研究

本报告将首先汇报pion介子电磁形状因子的高精度微扰QCD计算，然后介绍在精确的实验测量中理解pion介子的精细结构。

Speaker: Shan Cheng (Hunan University)

IHENP2025_FDU_scheng.pdf

09:40 From Quark to J/ψ: Probing the Strong Interaction Realm at RHIC-STAR

Abstract: From Quark to J/ψ: Probing the Strong Interaction Realm at RHIC-STAR

Quantum Chromodynamics (QCD) serves as the foundational theory of the strong interaction, governing the behavior of quarks and gluons. The production of J/ψ mesons provides a unique opportunity to explore both perturbative and non-perturbative regimes of QCD, while also serving as a sensitive probe to study the properties of hot and dense quark-gluon plasma (QGP) created in relativistic heavy-ion collisions. In this talk, we present the latest experimental results from the RHIC-STAR collaboration on J/ψ production in proton-proton collisions, with a focus on the novel measurements of J/ψ energy correlators, which shed light on the underlying partonic dynamics. Furthermore, we discuss the role of J/ψ spin observables in heavy-ion collisions as a tool to investigate the in-medium effects and the properties of the QGP. These measurements provide critical insights into the evolution of the strongly interacting matter from initial quark-gluon interactions to the formation of hadronic states.

Speaker: Qian Yang (Shandong University)

5. 杨钱-山东大学- From-quark-to-JPsi_v2.pdf

10:00 → 10:30 茶歇

10:30 → 12:15 分会场一: 机器学习等

Convener: Qiye Shou (Fudan University)

10:30 使用核碰撞仿真与机器学习研究核子核子关联

Speaker: LongGang Pang (Central China Normal University)

6.庞龙刚-华中师范大学-使用核碰撞仿真与机器学习研究核子核子关联.pdf

10:55 Jet momentum reconstruction in the QGP background with machine learning

We apply a Dense Neural Network (DNN) approach to reconstruct jet momentum within a quark-gluon plasma (QGP) background, using simulated data from PYTHIA and Linear Boltzmann Transport (LBT) Models for comparative analysis. We find that medium response particles from the LBT simulation, scattered out of the QGP background but belonging to medium-modified jets, can inevitably lead to oversubtraction of the background if the DNN model is trained on vacuum jets from PYTHIA simulation. By training the DNN model on quenched jets generated using the LBT model, we significantly reduce this prediction bias and achieve more accurate background subtraction compared to conventional Area-based and Constituent Subtraction methods widely adopted in experimental measurements. Additionally, we develop a matching procedure to pair reconstructed jets inside a background to their counterparts reconstructed without the background, further improving the reliability of ML models in background subtraction, and therefore enabling an accurate capture of the jet quenching effect and a precise estimation of the nuclear modification factor of jets in high-energy nuclear collisions.

[1] Ran Li, Yi-Lun Du, Shanshan Cao, arXiv:2412.06466

Speaker: YILUN DU (Shandong Institute of advanced technology)

中高能核物理2025_杜轶伦_ML_Jet_pT.pdf

11:15 Nuclear equation of state at finite $\mu_B$ using deep learning assisted quasi-parton model}

Accurately determining the nuclear equation of state (EoS) at finite baryon chemical potential ($\mu_B$) is crucial yet challenging in studying QCD matter under extreme conditions. This study develops a deep learning-assisted quasi-parton model using three deep neural networks. It reconstructs the QCD EoS at zero $\mu_B$ and predicts the EoS and transport coefficient $\eta/s$ at finite $\mu_B$. The model-derived EoS aligns well with lattice QCD results from Taylor expansion techniques. The minimum $\eta/s$ is about 175 MeV and decreases with increasing chemical potential within the confidence interval. This model offers a robust framework for understanding the QCD EoS at finite $\mu_B$ and provides essential input for relativistic hydrodynamic simulations of nuclear matter in heavy-ion collisions by the RHIC beam energy scan program.

Speaker: 甫鹏 李 (Central China Normal University)

李甫鹏-华中师范大学-Nuclear equation of state at finite 𝜇_𝐵 using deep learning assisted quasi-parton model.pdf

11:35 Intermittency analysis in relativistic heavy-ion collisions

Large density fluctuations near the QCD critical point have been suggested to exhibit power-law behaviors, which can be probed by intermittency analysis in heavy-ion collisions.

This talk will cover the latest experimental findings on intermittency from NA61/SHINE and NA49 at SPS, as well as the STAR Collaboration at RHIC. The experimental studies reveal that the signal of critical fluctuations related to intermittency is very weak and thus could be easily obscured by the overwhelming background noise in the data. By using a point cloud neural network integrated with topological machine learning, we can effectively distinguish weak signal events from this noise, enabling precise determination of the intermittency index of the data samples.

Lastly, I will highlight potential avenues for future research.

Speaker: Prof. Zhiming LI (Central China Normal University)

李治明-华中师范大学-Intermittency analysis in relativistic heavy-ion collisions.pdf

11:55 Measurement of Light Nuclei Production in Au+Au Collisions at √sNN = 3 - 200 GeV from RHIC-STAR

Light nuclei, as loosely bound objects with binding energies of a few MeV, provide a unique probe of the QCD phase structure and the nucleon coalescence mechanism in heavy-ion collisions. The systematic study of light nuclei production over a broad energy range enables insights into the properties of the dense baryonic matter created in such collisions. In the RHIC beam energy scan (BES) program, the STAR experiment has collected Au+Au collision data at $\sqrt{s_{\mathrm{NN}}}$ = 3.0 to 200 GeV in collider and fixed-target (FXT) modes, covering a wide range of collision energies. This dataset allows for the exploration of both high-temperature conditions ($\sim$165 MeV) and high baryon density regions ($\sim$750 MeV). It enables a systematic study of light nuclei production as a function of collision energy and centrality.

In this talk, we will report systematic measurements of protons and light nuclei ($d$, $t$, $^{3}\rm{He}$, and $^{4}\rm{He}$) production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3.0 - 200 GeV. The transverse momentum ($p_{T}$) spectra, coalescence parameters ($B_{A}$), particle yield ratios, and kinetic freeze-out parameters ($T_{\rm{ch}}$ versus $\left\langle\beta_{\rm{T}}\right\rangle$) will be reported. These results will be compared across different collision energies to investigate the energy dependence of light nuclei production. The comparisons will provide stringent constraints on coalescence and thermal models, thereby advancing our understanding of light nuclei formation in high-density QCD matter.

Speaker: Hui Liu (Huzhou University)

刘慧-湖州师范学院-Measurement of Light Nuclei Production in Au+Au Collisions at sNN = 3 - 200 GeV from RHIC-STAR.pdf

10:30 → 12:15 分会场三: 强子物理

Convener: Xu Sun (Institute of Modern Physics, Chinese Academy of Sciences)

10:30 喷注与冷核物质理论进展

Speaker: Dingyu Shao (Fudan University)

DYShao.pdf

10:55 SIDIS in the target fragmentation region

Lepton-nucleon semi-inclusive deep inelastic scattering (SIDIS) is an important way for accessing nucleon structure. SIDIS can be roughly divided into the current fragmentation region and the target fragmentation region (TFR) according to the kinematic regions of the detected hadron. The factorization of TFR SIDIS requires the introduction of fracture function. In this talk, I will introduce our theoretical progress on TFR SIDIS, including the high-twist effect for the process and the contribution of sub-leading order corrections to the structure functions. I will also briefly talk about the connection between nucleon energy correlator and fracture function.

Speaker: 开宝 陈 (山东建筑大学)

陈开宝-山东建筑大学-SIDIS in the Target Fragmentation Region.pdf

11:15 Study of the neutron-rich hydrogen isotope $\rm ^{6}H$ in electron scattering experiment at MAMI-A1

The neutron-rich isotopes of hydrogen, such as $\rm ^{6}H$ and $\rm ^{7}H$, are good platforms for the study of NN interactions in neutron-rich environments because they have the largest neutron-to-proton ratios known so far. However, the experimental and theoretical studies of them are still limited. For $\rm ^{6}H$, the energy of its ground state is still controversial. It is about 2.7 MeV (above the $\rm ^{3}H$+3n threshold) in some experiments but about 6.6 MeV in others. The actual location of the $\rm ^{6}H$ ground state remains an open problem in theoretical work as well.

To solve this puzzle, $\rm ^{6}H$ is studied for the first time in an electron scattering experiment with the reaction $\rm ^{7}Li(e, e'p\pi^{+})^{6}H$ at MAMI-A1. The 855 MeV electron beam of the Mainzer Microtron (MAMI) is used to hit a $\rm ^{7}Li$ target. The scattered electron, the produced proton, and $\pi^{+}$ are measured by the three-spectrometer setup in the A1 hall. With the triple timing coincidence and momentum measurements of three spectrometers, the missing mass spectrum of $\rm ^{6}H$ can be obtained. In this talk, we will present the details of our experiment. The principle, setup, and data analysis of the experiment, including corrections and calibrations of the data, will be discussed. Our measurement of the $\rm ^{6}H$ ground state energy and its width will be shown and compared with previous measurements and theoretical calculations.

Speaker: 天浩 邵 (复旦大学)

邵天浩-复旦大学-Study of the neutron-rich hydrogen isotope 6H in an electron scattering experiment at MAMI-A1.pdf

11:35 Theoretical study on the recently observed Tcs state

In the last two decades, there are many open and hidden charmed exotics were discoveried. The investigations of their dynamics have been an ongoing and central issue in the study of nonperturbative Quantum Chromodynamics. Very recently, the LHCb collaboration observed the Tcs state in the Ds(2460) decay. In this talk, I will present our recent investigation on the nature of this state and predict its production through Ds(2536) decay.

Speaker: Zhi Yang (IMP, CAS)

9 杨智-Theoretical study on the recently observed Tcs state.pdf

11:55 Measurements of proton-antiproton pairs from QED vacuum excitation in Au+Au ultra-peripheral collisions at $\sqrt{s_{\rm{NN}}} = $ 200 GeV from STAR

Relativistic heavy-ion collisions generate extremely strong electromagnetic (EM) fields, providing an ideal environment to study the EM excitation of the vacuum. The Breit-Wheeler process, which involves the electron-position pair production via photon-photon interactions, represents the lowest-order decay mode of the QED vacuum excitation. This process was first observed by the STAR experiment in 2021, and has stimulated further exploration into higher-order decay modes, including hadron-antihadron pair production.

In this presentation, we will report the first measurement of proton-antiproton pairs resulting from QED vacuum excitation in Au+Au ultra-peripheral collisions at $\sqrt{s_{\rm{NN}}} = $ 200 GeV by the STAR experiment. The pairs' invariant mass distributions (from $M_{p\bar{p}}$ = 2.1 to 2.4 $\rm{GeV}/c^{2}$), transverse momentum $p_\rm{T}$ spectra, and the azimuthal angular modulation caused by the polarized EM field will be presented. The measured results will be compared with theoretical calculations. These measurements will shed new light on the understanding of the QED vacuum.

Speaker: 鑫 吴 (中国科学技术大学)

吴鑫-中国科学技术大学-Observation of proton-antiproton pairs from QED vacuum excitation in Relativistic heavy-ion collisions.pdf

10:30 → 12:15 分会场二: 强子物理

Convener: Yong-Liang Ma (Theoretical Physics Center for Science Facilities, CAS.)

10:30 Effective range expansion with the left-hand cut from OPE

Speaker: 孟林 杜 (电子科技大学)

ERE w LHC.pdf

10:55 Do we still need quark model?

The quark model has long been a cornerstone for understanding the hadron spectrum. However, in recent years, numerous hadrons have been observed experimentally that fall outside the predictions of the traditional quark model. Meanwhile, theoretical advancements in methods more closely aligned with QCD—such as chiral effective field theory, the Dyson-Schwinger equation formalism, and lattice QCD—have gained prominence. These developments appear to have pushed the quark potential model into a corner.

In this talk, I will revisit the significance of the quark model and explore what kind of quark model is needed to adapt to the demands of this new era. I will present a benchmark test of the quark model using various potentials and few-body approaches. Additionally, I will introduce an automated, high-precision package designed for studying multiquark resonance systems.

Speaker: 璐 孟 (Ruhr University Bochum)

qm_slides.pdf

11:15 CEPC上全粲和双粲四夸克态产生机制的研究

近年来，LHCb发现了Tcc(3875)和全粲四夸克态的候选X(6900)，它们结构和衰变性质被实验和理论广泛研究。因此我们在NRQCD框架下，通过Higgs和弱玻色子衰变研究了双粲紧致四夸克态的间接产生机制，并分别在LHC和CEPC上预言了其分支比和产生率等。同时基于共线因子化，利用两种碎裂函数方法，我们也对全粲四夸克态的间接产生性质也进行了深入的研究。通过此报告将详细介绍近期我们关于四夸克态间接产生的理论研究工作，并期望对CEPC上的奇特强子态的研究提供一定的理论数据支撑。

Speaker: 鸿浩 马 (Guangxi Normal University)

NRQCD_四夸克态_上海.pdf

11:35 Factorization Connecting the Shape Function of Heavy Meson in QCD and HQET

In this talk, I will give a factorization formula which connects the shape function defiend in QCD and HQET. This factorization merges the virtues of both shape functions. Given that much phenomenological knowledge on the shape function defined in HQET has been garnered from inclusive $B$ decay processes, we can utilize this factorization to ascertain the starting point of heavy quark mass evolution in full QCD. Additionally, this factorization formula lays a theoretical foundation for us to simulate the shape functions of heavy mesons on the lattice.

Speaker: 吉 徐 (中国科学院大学物理科学学院)

9. 徐吉-兰州大学-Facto rization Connecting the Shape Function.pdf

11:55 Open-charm production in small systems at LHCb

The forward geometry and precision instrumentation of the LHCb spectrometer provides unique insights into the production of heavy quarks at the LHC. Heavy quark production in pPb collisions are sensitive to the modification of nuclear parton distribution functions, energy loss in the nucleus, and the hadronization process, among other effects. In this talk, precision measurements of open charm production from a rich set of charmed hadrons in pPb and pp collisions will be presented, including new LHCb measurements of D mesons and $\Xi_c^+$ baryons in pp and pPb collisions. Comparisons with theoretical models and related results will be discussed.

Speaker: 剑桥 王 (Tsinghua University)

王剑桥-清华大学-Charm_production_in_small_systems_at_LHCb.pdf

12:15 → 14:00 午餐

14:00 → 15:45 分会场一: QCD相结构

Convener: Hengtong Ding (Institute of Particle Physics, Central China Normal University)

14:00 Liquid gas transition of nuclear matter in QCD

We illustrate that the nuclear liquid gas transition of nucleon can be described in quantum chromodynamics through combining the quark gap equation and Faddeev equation of nucleon. We investigate the liquid gas transition at zero temperature and
finite chemical potential, and analyze that there exists a finite difference of gas and liquid solution of quark propagator due to the shift of the nucleon pole mass in medium that is generated in the nucelon channel in quark gap equation. Such a difference leads to a first order phase transition and determines the binding energy of nucleon and the saturation density. We apply a model independent analysis after approximating such a difference as a contour that involves the contribution from the difference of two poles and then derive an analytical relation of binding energy and the sigma term of nucleon which then gives the binding energy being $E/A=15.9$ MeV. Moreover, by similarly relating the vector charge of nucleon to the nuclear saturation density together with the binding energy, one also finds the saturation density $n_{\rm B}^0=0.15$ fm$^{-3}$.

Speaker: fei gao (Beijing Institute of technology)

liquidgas.pdf

14:25 恒星环境强场对3alpha反应率的影响

3α过程是宇宙核合成中最关键的反应之一，它控制着碳的合成，并作为通往更重元素的门户，塑造了宇宙中观测到的元素丰度[1-3]。三个α粒子通过中间态Be-8原子核产生C-12的共振态。稳定C-12的生成速率取决于共振态的衰变宽度。最为C-12最重要的共振态，霍伊尔态的衰变宽度已通过地面实验室得到了高精度测量，并用于计算三α反应率。

然而，强场核物理学的最新进展挑战了这种传统的核合成范式：恒星环境中的衰变宽度与自由空间中的衰变宽度相同吗？目前最先进的激光场强度可达10^23 W/cm^2[4]，这与高密度恒星环境等离子体中α粒子所受到的库仑场强度相当。人们已经法相了如此强度的激光场改变了核过程，如衰变产物的光谱[5]、衰变隧穿率[6-10]和聚变截面[11-13]等。

在这项工作中，我们基于TDHF模型研究了强库仑场环境下C-12链状态的共振与衰变，提取了不同场强下的共振时间，发现强场加速C-12链状态衰变的规律。在此基础上，基于反应率公式研究了强库仑场对3α反应率的增强效应，结果表明，当恒星密度为10^9 g/cm^3时，恒星等离子体提供的库仑场可使3α反应速率提高1252倍。值得注意的是，质子弹性散射的类似增强已被证明会影响重质量原子核的产生[14,15]。这项工作介绍了以前被忽视的强库仑电场的效应，为3α反应速率增强提供了一个新的视角，并强调了它们对预测恒星环境中重元素丰度的重要性。

[1] F. Herwig, S. M. Austin, and J. C. Lattanzio, Phys. Rev. C 73, 025802 (2006).
[2] C. Tur, A. Heger, and S. M. Austin, The Astrophysical Journal 671, 821 (2007).
[3] C. West, A. Heger, and S. M. Austin, The Astrophysical Journal 769, 2 (2013).
[4] J. W. Yoon, Y. G. Kim, I. W. Choi, J. H. Sung, H. W. Lee, S. K. Lee, and C. H. Nam, Optica 8, 630 (2021).
[5] H. M. Castaneda Cortes, C. Muller, C. H. Keitel, and A. Paly, Physics Letters B 723, 401 (2013).
[6] D. S. Delion and S. A. Ghinescu, Physical Review Letters 119, 202501 (2017).
[7] S. Misicu and M. Rizea, Journal of Physics G: Nuclear and Particle Physics 40, 095101 (2013).
[8] D. P. Kis and R. Szilvasi, Journal of Physics G: Nuclear and Particle Physics 45, 045103 (2018).
[9] D. Bai, D. Deng, and Z. Ren, Nuclear Physics A 976, 23 (2018).
[10] S. A. Ghinescu and D. S. Delion, Physical Review C 101, 044304 (2020).
[11] F. Queisser and R. Schutzhold, Physical Review C 100, 041601 (2019).
[12] W. Lv, H. Duan, and J. Liu, Physical Review C 100, 064610 (2019).
[13] S. Liu, H. Duan, D. Ye, and J. Liu, Physical Review C 104, 044614 (2021).
[14] S. Jin, L. F. Roberts, S. M. Austin, and H. Schatz, Nature 588, 57 (2020).
[15] H. Sasaki, Y. Yamazaki, T. Kajino, and G. J. Mathews, Physics Letters B 851, 138581 (2024).

Speaker: Jun Su (Sun Yat-sen University)

12.恒星环境强场对2alpha反应率的影响-苏军-中山大学.pptx

14:45 Characteristics and influences of nonequilibrium evolution near the phase boundary of 3D Ising model

临界慢化现象导致临界点附近的相对论重离子碰撞难以达到热平衡，其非平衡演化对末态观察量将产生定性的影响。我们采用Metroplis算法模拟了三维伊辛模型在临界点附近从非平衡态到平衡态的演化，给出了临界点附近的非平衡演化对序参量高阶矩的影响。然后我们把此研究拓展到一级相变线附近，发现一级相变情况的平衡时间比临界点更长，平衡时间的动力学指数比临界动力学指数更大，我们称之为一级相变的极端慢化现象。为了弄清一级相变慢化的原因，我们计算了一级相变线附近的自由能，自由能决定了弛豫的方向和弛豫速率。

该报告基于以下三篇工作：
[1] Xiaobing Li, Mingmei Xu, Yuanfang Wu et al., Investigations into the characteristics and influences of nonequilibrium evolution, Phys. Rev. C 105, 064904 (2022).
[2] Xiaobing Li, Ranran Guo, Mingmei Xu, Yuanfang Wu et al., Relaxation behavior near the first-order phase transition line, arXiv: 2412.18909, submitted to Phys. Rev. E.
[3] Ranran Guo, Xiaobing Li, Mingmei Xu, Yuanfang Wu et al., in preparation.

Speaker: 明梅 许 (ccnu)

13.许明梅-华中师范大学-非平衡演化.pdf

15:05 Kaon superfluidity in the early Universe

Previously, it was found that pion superfluidity could be realized in the quantum chromodynamics
(QCD) epoch of the early Universe, when lepton flavor asymmetry jle þ lμj is large enough to generate
a charge chemical potential jμQj larger than vacuum pion mass. By following the same logic, kaon
superfluidity might also be possible when jle þ lμj is so large that jμQj becomes larger than vacuum kaon
mass. Such a possibility is checked by adopting Ginzburg-Landau approximation within the three-flavor
Polyakov–Nambu–Jona-Lasinio model. Consider the case with full chemical balance, though kaon
superfluidity could be stable compared to the chiral phases with only σ condensations, it would get killed
by the more favored homogeneous pion superfluidity. If we introduce mismatch between s and d quarks,
kaon superfluidity would require so large s quark density that such a state is impossible in the early
Universe.

Speaker: 高清 曹 (Sen Yat-sen University)

14.曹高清--Kaon superfluidity in the early Universe.pdf

15:25 Entanglement in the nuclear collective motion

Entanglement is a fundamental concept in quantum mechanics that describes the non-factorizable correlations between subsystems of a composite quantum system, which can not be fully characterized by the independent states of its components. This talk will present our recent study of entanglement in the nuclear collective motion, including wobbling motion and chiral rotation. The entanglement is measured by the entanglement entropy and concurrence fill. The effects of rotation, excitation, and deformation on the entanglement will be introduced. Additionally, possible experimental probe to detect the entanglement in the collective rotation will be discussed.

Speaker: 启博 陈 (华东师范大学)

15.陈启博-华东师范大学-Entanglement in the nuclear collective motion.pptx

14:00 → 15:45 分会场三: 高密核物质

Convener: 伟杰 付 (大连理工大学)

14:00 散射截面介质修正对抽取高密区状态方程软硬信息的影响

核物质状态方程（EoS）在大密度区的行为研究是核物理及其相关交叉领域（特别是核天体物理）都长期持续关注并快速推进的课题。当前，在QCD相变前的约2-4倍常密区的EOS软硬问题得到了从核理论、微观输运模型、地面重离子碰撞实验、中子星研究到机器学习+贝叶斯分析的广泛关注。在这些丰富的、针对EOS密度依赖演化的多手段信息抽取过程中，一个亟需更加重视的基础性问题是由相关理论及模型研究滞后所带来的不小的模型依赖现象[1]。因此，迄今为止还远未到业内对这个密度范围EOS软硬形成共识的时候。本报告拟从EOS超过70年的研究历史视角出发，重点关注过去30年EOS密度依赖和同位旋依赖的演进过程，特别强调在重离子碰撞的非平衡输运过程中两体散射的介质修正对抽取高密区状态方程软硬信息的自洽性影响问题。基于自洽的RBUU输运理论，我们研究组近期针对核介质中$\Delta_{1232}$共振态相关的两体散射截面理论计算和微观输运模型的更新工作都展示出更好描述多观测量实验数据的能力以及抽取大密度范围EOS信息的鲁棒性[2-5]。此外，介质截面的温度依赖性问题也正在进行中。

[1] TMEP collaboration, Prog. Part. Nucl. Phys. 125, 103962 (2022).
[2] K. Godbey, Z. Zhang, J. W. Holt and C. M. Ko, Phys. Lett. B 829, 137134 (2022).
[3] M.Z. Nan, P.C. Li, Y.J. Wang, Q.F. Li, W. Zuo, Eur. Phys. J. A 60, 131 (2024).
[4] M.Z. Nan, P.C. Li, W. Zuo, Q.F. Li, arXiv:2412.13497.
[5] Y. Y. Liu, J. P. Yang, Y. J. Wang, Q. F. Li, Z. X. Li, C. J. Xia, Y. X. Zhang, Nucl. Sci. Tech. 36, 45 (2025).

Speaker: Prof. 庆峰 李 (湖州师范学院)

介质修正的散射截面_v4.pdf

14:25 Search for Baryon Junction with Relativistic Heavy Ion Collisions at STAR

Conventionally, quarks are believed to carry a baryon number of B = 1/3. Therefore, three quarks combine to form a baryon with B = 1, while a quark-antiquark pair form a meson with B = 0. Meanwhile, an alternative picture was proposed in early 1970s, which stipulates that valence quarks are connected by gluons in a Y-shaped topological structure, called the baryon (or gluon) junction. It is this topological configuration of the gluons that is posited to trace the baryon number. Neither scenario has been verified experimentally. In this talk, the search for baryon junction using the heavy collisions data collected by the STAR experiment will be presented. Physics implication will also be discussed.

Speaker: Zebo Tang (University of Science and Technology of China)

baryon_junction.pdf

14:45 Transport coefficients of QCD matter at finite temperature and density

The viscous properties of quark-gluon plasma (QGP) are closely related to the evolution of high-energy heavy-ion collisions and the momentum distributions of final-state hadrons. With the progress of the RHIC beam energy scan experiments, an important question is how transport coefficients (such as shear viscosity and bulk viscosity) evolve dynamically in QGP under different collision energies. Recently, we calculated the viscosity coefficients of QGP across the entire QCD phase diagram using the Boltzmann transport equation and the PNJL quark model. At this conference, we will report the dependence of the viscous properties of quark matter on temperature and baryon number density, as well as its relationship with the QCD phase transition.

Speaker: Guo-yun SHAO (Xi'an Jiaotong University)

15:05 Production of the pion string in a hot and dense quark matter

During the chiral phase transition, the pion string is predicted to be produced both in the heavy ion collisions and early universe according to the phenomenology of QCD theory. In this talk, we will present our recent studies on the topic of the production rate of the pion string in a hot and dense quark matter. For a second-order phase transition in hot but low density region, We apply the Kibble-Zurek mechanism to estimate how many strings will be produced at a chiral phase transition. On the contrary, for a first-order phase transition in low but high density, we utilize the bubble nucleation theory to give out the number of the pion strings at a phase transition.Our results are of interest in searching of cosmic strings or other topological defects in heavy ion collision experiments and the cosmology.

Speaker: Dr Hong Mao (Hangzhou Normal University)

毛鸿 杭州师范大学 Production of pion string in a hot and dense quark matter.pptx

15:25 Productions of of ³ΛH, ⁴ΛH and ⁴ΛHe in different coalescence channels in Au-Au collisions at √sNN=3 GeV

We study the productions of $\Lambda$-hypernuclei $^3_{\Lambda}$H, $^4_{\Lambda}$H and $^4_{\Lambda}$He in the coalescence mechanism in Au-Au collisions at $\sqrt{s_{NN}}=3$ GeV. Considering the abundance and great importance on the collision dynamics of baryons and light (hyper-)nuclei, we include not only nucleon$+\Lambda$ coalescence but also nucleus+nucleon($\Lambda$) coalescence. We present contributions from different coalescence channels for $^3_{\Lambda}$H, $^4_{\Lambda}$H and $^4_{\Lambda}$He in their productions. We explain the centrality and rapidity dependent behaviors of $^3_{\Lambda}$H and $^4_{\Lambda}$H measured by the STAR Collaboration. We propose that the production asymmetry between $^4_{\Lambda}$H and $^4_{\Lambda}$He can give constraints on the existences of the possible neutron-$\Lambda$ bound states $^2_{\Lambda}n(n\Lambda)$ and $^3_{\Lambda}n(nn\Lambda)$.

Speaker: 瑞芹 王 (曲阜师范大学)

王瑞芹-曲阜师范大学-Hypernuclei production at RHIC 3GeV.pdf

14:00 → 15:45 分会场二: 强子物理

Convener: Hongxia Huang (Nanjing Normal University)

14:00 利用国产格点组态计算高精度ρ介子质量和宽度

Speaker: Jia-Jun Wu (IHEP)

Rho-shanghai.pdf

14:25 Hyperon-Nucleon Interaction from Lattice QCD

Lattice QCD provides a foundational technique for investigating the interaction between hadrons. We study proton-hyperon scattering using lattice QCD within Luscher′s finite volume method and HALQCD method. This calculation provides some useful information on the nature of the interaction between proton and hyperon.

Speaker: Hang Liu

刘航-上海师范大学-Hyperon-Nucleon Interaction from Lattice QCD .pdf

14:45 Shear and bulk viscosities of gluon plasma across the transition temperature

Shear and bulk viscosities are two key transport coefficients that characterize the fundamental properties of quark-gluon plasma. They quantify the response of the energy-momentum tensor to the shear flow and divergent flow, serving as crucial input parameters for the phenomenological and transport models that interpret experimental data, e.g. the elliptic flow $v_2$.

However, calculating these inherently non-perturbative viscosities within lattice QCD presents challenges due to strong ultraviolet fluctuations in the relevant operators. The traditional approach using the multi-level algorithm has the limitation that it applies only in the quenched approximation, as done in [1, 2]. Recently, the gradient flow method was introduced to address this issue [3], opening the path to studies in full QCD. However, [3] examined only a single temperature, 1.5$T_c$.

In this talk, we present results extending [3] to a wide temperature range from 0.76$T_c$ to 2.25$T_c$ [4], with particular focus on the phase transition region and high-temperature regime. The former helps us to understand how the system behaves under the critical change, a topic of wide concern in the community. The latter allows us to compare against the NLO perturbative estimate, which becomes more reliable at high temperature. The methodology developed in this study positions us well for a full QCD calculation in the near future.

References:
[1] N. Astrakhantsev, V. Braguta, and A. Kotov, J. High Energy Phys. 04 (2017) 101.
[2] N. Astrakhantsev, V. Braguta, and A. Kotov, Phys. Rev. D 98, 054515 (2018).
[3] L. Altenkort, A.M. Eller, A. Francis, O. Kaczmarek, L. Mazur, G.D. Moore, and H.-T. Shu, Phys. Rev. D 108, 014503 (2023).
[4] H.-T. Ding, H.-T. Shu and C. Zhang, work in progress.

Speaker: Prof. Cheng Zhang (Central China Normal University)

CZ_viscosity_project.pdf

15:05 Recent results on the charmonium and X(6900) productions in pp collisions from the PACIAE model

In this work we simulate the J/ψ and the exotic hadron X(6900) productions in proton-proton collisions at the LHC energies with the parton and hadron cascade model PACIAE This model is based on PYTHIA but extended considering the partonic and hadronic rescatterings before and after hadronization, respectively. The relative contributions from the NRQCD channels, the cluster collapse and the weak decay of B hadrons to the total J/ψ yield as a function of pT at mid- and forward-rapidity are analyzed. Moreover, we explore the contributions from different production mechanisms to the self-normalized yields of J/ψ as a function of the charged-particle multiplicity. Finally, we investigate the difference between the yields, rapidity distributions and transverse momentum spectra of X(6900) composed of $cc\bar{c}\bar{c}$ or J/ψJ/ψ for providing criteria of different configurations and give the possible quantum numbers $J^{PC}$ for X(6900).

Speaker: Wenchao Zhang (陕西师范大学)

Wenchao_Zhang_presentation_Shanghai_v3.pdf

15:25 Charmonium and X(3872) production in heavy-ion collisions

Heavy ion collisions provide a unique opportunity to study the nature of X(3872) compared with electron-positron and proton-proton (antiproton) collisions. We investigate the centrality and momentum dependence of X(3872) in heavy-ion collisions via the Langevin equation and instant coalescence model (LICM). When X(3872) is treated as a compact tetraquark state, the tetraquarks are produced via the coalescence of heavy and light quarks near the quantum chromodynamic (QCD) phase transition due to the restoration of the heavy quark potential at $T\rightarrow T_c$. In the molecular scenario, loosely bound X(3872) is produced via the coalescence of $D^0$-$\bar D^{*0}$ mesons in a hadronic medium after kinetic freeze-out. We employ the LICM to explain both $D^0$ and $J/\psi$ production as a benchmark. Then we give predictions regarding X(3872) production and the nuclear modification factor $R_{AA}^{X(3872)}$. We find that the total yield of tetraquark is several times larger than the molecular production in Pb-Pb collisions. Although the geometric size of the hadronic molecule is huge, the coalescence probability is small due to strict constraints on the relative momentum between $D^0$ and $\bar D^{*0}$ in the molecular Wigner function, which significantly suppresses the molecular yield. The nuclear modification of $B_c$ is also calculated based on the same approach.

Speaker: Baoyi Chen (Tianjin University)

陈保义-天津大学-X3872 and charmonium.pdf

15:45 → 16:10 茶歇

16:10 → 18:05 分会场一: 初态核效应

Convener: KaiJia Sun (Institute of Modern Physics, Fudan University)

16:10 Physics opportunities from relativistic isobar collisions

Speaker: Haojie Xu (Huzhou University)

16.徐浩洁-中高能0426_HaojieXu.pdf

16:35 Hyperon-Nucleon Spectrometer at HIAF

Speaker: Yuxiang Zhao (University of Science and Technology of China (USTC))

17.赵宇翔-近代物理研究所-H yperon-Nucleon-Spectrometer-at-HIAF.pdf

17:00 Observation of a family of all-charm tetra-quark candidates at CMS

Speaker: Kai Yi (Nanjing Normal University)

18.中高能物理大会KaiYi.pdf

17:25 Nuclear Clustering and Non-Equilibrium Dynamics in Small-System Collisions

This study explores how α-clustering in light nuclei (e.g., 16O) and non-equilibrium dynamics shape quark-gluon plasma (QGP) signals in small collision systems (16O+16O, 20Ne+20Ne). Using the AMPT model, we simulate collisions at RHIC and LHC energies and show that α-clustering induces initial-state inhomogeneities that imprint distinct collective flow. Extended parton interaction times are critical to match the experimental data, challenging hydrodynamic models that assume rapid thermalization.

Key discrepancies between AMPT and hydrodynamics highlight the dominance of pre-equilibrium dynamics in small systems, where limited rescattering preserves initial-state memory. Nuclear clustering reshapes the fireball energy density, requiring structure-aware models, while non-equilibrium phases blur traditional QGP formation criteria. Collective signals may be due to pre-thermal parton interactions rather than thermalized matter.

These results bridge nuclear structure and QGP physics, urging unified frameworks to address QCD phase diagram puzzles. Future experiments probing clustered nuclei will refine our understanding of strongly interacting matter under extreme conditions.

Speaker: Dr XINLI ZHAO (University of Shanghai for Science and Technology)

ampt-o16-xinlizhao.pptx

17:45 Study nucleus structure through spectator particle yield in relativistic heavy-ion collisions

We propose a new method to study nucleus structure through forward-/backward-rapidity particle yield in relativistic heavy-ion collisions. These particles are produced from the multifragmentation process of spectator matter, so they do not experience the complicated midrapidity dynamics, and can be experimentally measured using zero-degree calorimeters. We found that the yields of spectator neutrons and protons can be probes of the neutron skin in colliding nuclei, and the scaled yields of spectator light nuclei can be probes of the alpha-cluster structure in colliding nuclei.

Speaker: 骏 徐 (同济大学)

徐骏-同济大学-Study nucleus structure through spectator particle yield in relativistic heavy-ion collisions.pdf

16:10 → 18:00 分会场三: 高密核物质

Convener: Jie Zhao (Fudan Unversity)

16:10 奇异数产生反应中核子激发态的研究

Speaker: Fei Huang (University of Chinese Academy of Sciences)

16:35 Probing clustering correlations in warm and dense nuclear matter via intermediate-energy heavy-ion collisions

Speaker: 振 张 (中山大学)

17:00 重离子碰撞中守恒荷涨落与QCD相变的输运模型研究

量子色动力学（QCD）相图结构的研究是核物理研究领域的热点与前沿，寻找QCD相变信号和确定QCD相图结构对于高能物理、宇宙学以及核天体物理等领域具有非常重要的意义。该工作主要是基于电荷守恒版多相输运（AMPT）模型对守恒荷涨落性质进行了研究，为未来在相对论重离子碰撞实验中探索QCD相结构提供一些理论参考。考虑到AMPT模型遵循电荷守恒定律对研究守恒荷涨落的重要性，故修正了ART模型中电荷不守恒的一些强子反应道等问题。
基于电荷守恒版AMPT模型计算了$\sqrt{s_{NN}}=7.7$ GeV下Au+Au碰撞中净质子和净K介子多重数分布的累积量、累积量比率和关联函数，发现AMPT模型可以基本描述STAR实验结果。在AMPT模型中我们通过计算多重子关联函数观察到了整个重离子碰撞演化过程中存在负两粒子关联、正三粒子关联以及正四粒子关联，与重子数守恒预期一致。通过计算净奇异数和净K介子的累积量及关联函数，发现它们都源于对产生。
在研究基础上引入了FRG净重子分布，主要目的是研究强子散射对临界涨落的影响，即在强子演化之后临界涨落是否还能存在？这是一个与实验上寻找QCD临界点相关的关键问题。发现强子再散射演化阶段对临界涨落的影响比对动力学涨落的影响更显著。
最后，基于电荷守恒版AMPT模型还对净电荷、净质子和净K介子多重数分布的二阶非对角元和对角元累积量以及重子—奇异数关联进行了研究，研究结果显示AMPT模型末态遵守电荷守恒定律对上述物理量的影响不可忽略。
参考文献：
（1）Qian Chen and Guo-Liang Ma. Phys. Rev. C, 2022, 106(1): 014907.
（2）Qian Chen, Han-Sheng Wang, and Guo-Liang Ma. Phys. Rev. C, 2023, 107(3): 034910.
（3）Qian Chen, Rui Wen, Shi Yin, Wei-jie Fu, Zi-Wei Lin, and Guo-Liang Ma. arXiv:2402.12823.

Speaker: Dr 倩 陈 (广西师范大学)

18 陈倩-重离子碰撞中守恒荷涨落与QCD相变的输运模型研究.pdf

17:20 Study of skewness and kurtosis of mean transverse momentum fluctuations from a multi-phase transport model at LHC

The ALICE collaboration has recently reported the first measurements of the skewness and kurtosis of mean transverse momentum fluctuations in Pb–Pb collisions at 5.02 TeV, Xe–Xe collisions at 5.44 TeV, and pp collisions at 5.02 TeV. A positive skewness is observed and attributed to the hydrodynamic evolution of the quark-gluon plasma (QGP) formed in heavy-ion collisions. In this study, we investigate these observables using the multi-phase transport (AMPT) model. We first show that with effective parton and hadron cross sections, the AMPT model successfully reproduce the experimental measurements of skewness and kurtosis across all three collision systems. Next, we investigate the effects of final state interactions by varying the parton cross sections in the model. Notably, when parton and hadron scatterings are effectively switched off, the skewness transitions to negative values in the semi-central to central regions. These findings highlight the crucial role of final-state interactions in generating the positive skewness observed in heavy-ion collisions.

Speaker: 潮 张 (Central China Normal University)

17:40 Measurement of $K^{+}K^{+}$ Femtoscopic Correlations in Au+Au Collisions at $\sqrt {s_{NN}}$ = 3.0 - 3.9 GeV

Two-particle correlation analysis serves as a powerful tool for probing the space-time evolution and dynamical properties of particle-emitting sources produced in relativistic heavy-ion collisions. The experimentally extracted source radii reflect the system's spatial extent at kinetic freeze-out, the final stage where particles stop interacting. Compared to pions, kaons offer enhanced sensitivity for source characterization due to their significantly reduced hadronic interaction cross sections and minimal contamination from long-lived resonance decays.

In this study, we present systematic measurements of $K^{+}K^{+}$ correlation functions in Au+Au collisions at $\sqrt{s_{NN}}$ = 3.0, 3.2, 3.5, and 3.9 GeV using the STAR detector at RHIC. Through a rigorous fitting procedure employing the Bowler-Sinyukov formalism, we quantitatively determine the one-dimensional effective source radius ($R_{inv}$) and correlation strength parameter ($\lambda$). A comprehensive comparison between the experimental results and the predictions of the UrQMD+CRAB model provides critical insights into the collision dynamics in the high baryon density region of the QCD phase diagram.

Speaker: Bijun Fan (Central China Normal University)

樊碧君-CCNU-Femtoscopic Measurements of Charged Kaons in Au+Au Collisions at STAR FXT energies.pdf

16:10 → 18:00 分会场二: 强磁场与涡旋

Convener: Yifei Zhang (University of Science and Technology of China)

16:10 Magnetic Field Effects on Photons in Heavy Ion Collisions

In this presentation, I will examine the role of intense magnetic fields generated in relativistic heavy ion collisions and their observable effects on photon production. These magnetic fields, among the strongest in the known universe, can interact with the quark-gluon plasma (QGP) and its surrounding charged particle dynamics, leaving imprints on emitted photons. I will synthesize recent advances in theoretical frameworks，focusing on how magnetic fields influence photon emissions and azimuthal anisotropy.

Speaker: Prof. xinyang wang (Anhui University of Science & Technology)

王昕杨-安徽理工大学-Magnetic Field Effects on Photons in Heavy Ion Collisions.pptx

16:35 相对论重离子碰撞中的早期流体化

Speaker: Shuzhe Shi (Tsinghua University)

施舒哲-清华大学-重离子碰撞中的早期热化.pdf

17:00 Jet-induced medium excitation and vortex ring within a $\phi^4$ field simulation

We investigate medium response to jet energy loss using a self-interacting $\phi^4$ field coupled to an external source, with a focus on the formation of Mach cones and associated vortex rings. By employing an ensemble averaging technique, we demonstrate that the $\phi^4$ field can approach thermal equilibrium, where resonance modes play a critical role in facilitating this thermalization. From the energy-momentum tensor of the field at equilibrium, we extract key bulk properties of the medium, including its collective behavior, equation of state, and speed of sound, all of which align with the hydrodynamic description of a thermal medium. We further explore the structures of shock wave, diffusion wake, and the local vorticity field of the medium induced by jet energy loss, and find that these features are sensitive to the mass and coupling strength of the field. This work presents a novel approach for studying jet-medium interactions in high-energy nuclear collisions, providing a pathway to constrain quark-gluon plasma (QGP) properties through medium response signatures and to gain insights into the local polarization of the QGP induced by jets.

Speaker: Jian Deng (Shandong University)

18. Jet-Phi4-jdeng-2025-Apr.pptx

17:20 Effect of vorticity on the dynamical magnetic fields in heavy-ion collisions

Magnetic fields in heavy-ion collisions are pivotal and subject to diverse factors. In this study, we quantitatively investigate the impact of fluid vorticity on the evolution of magnetic fields in the 20%-50% centrality class in Au + Au collisions, with collision energies of √sNN = (7.7, 14.5, 19.6, 27, 39, 62.4, 200) GeV. Our results indicate that fluid vorticity leads to a delay in the evolution of the magnetic field, in which this effect becomes more pronounced as the collision energy decreases. Additionally, we have calculated the mean magnetic field values on the freeze-out hypersurface for various collision energies. Our simulation results align with the values inferred from experimental data of Λ − Λ̅, within the error margins.

Speaker: anping huang (Tsinghua University)

19. 黄安平-中国矿业大学-the effect of vorticity on the dynamical electromagnetic field.pptx

17:40 Measurements of Hyperons Global Polarization in Au+Au collisions at BES-II energies from RHIC-STAR

The observation of hyperon global polarization along the system's angular momentum has revealed the existence of large vorticities in the medium created by heavy-ion collisions.
Using the high-statistics data collected by the STAR experiment during the RHIC Beam Energy Scan II (BES-II) program with upgraded detector systems, we present the global polarization measurements for $\Lambda$, $\bar\Lambda$, $\Xi^{\pm}$ hyperons in Au+Au collisions at BES-II energies ($\sqrt{s_{\mathrm{NN}}} = 7.7, 9.2, 11.5, 14.6, 17.3, 19.6, 27$ GeV). Specifically, we focus on the possible differences in polarization between $\Lambda$ and $\bar\Lambda$, as well as the polarization behaviors observed in different hyperons ($\Xi^{\pm}$).
These results provide new insights into the polarization mechanism and vorticity fields in heavy-ion collisions as well as additional constraints on the properties and dynamics of the hot and dense matter created in these collisions.

Speaker: 兴瑞 苟

苟兴瑞-山东大学-Measurements of Hyperons Global Polarization in Heavy Ion Collisions from STAR.pdf

18:05 → 20:00 晚餐

20:00 → 21:00 海报展示

Sunday, 27 April

08:15 → 10:00 分会场一: 理论进展

Convener: Yifeng Sun (Shanghai Jiao Tong University)

08:15 基矢光前量子化方法新进展

Speaker: Xingbo Zhao (Institute of Modern Physics, Chinese Academy of Sciences)

第二十届全国中高能核物理大会_XZ_250426.pptx

08:40 Functional renormalization group study of anomalous magnetic moment in Nambu-Jona-Lasinio model

The anomalous magnetic moment (AMM) is calculated in the 2-flavor Nambu-Jona-Lasinio (NJL) model within the functional renormalization group (FRG) approach under an extra magnetic field. Schwinger proper time formalism and weak-field expansion of quark propagators are employed respectively, and Fierz-complete four-quark interactions are self-consistently included through RG flows. The AMM of the up and down quarks are distinguished, and the temperature dependence is investigated. The AMM in the direction perpendicular to the magnetic field monotonically decreases with increasing magnetic field, while the AMM in the parallel direction monotonically increases with the magnetic field.

Speaker: 睿 温 (UCAS)

温睿-中国科学院大学-Functional renormalization group study.pdf

09:00 Attractor of hydrodynamics with general rapidity distribution

The thermalization of the hot and dense QGP created in heavy-ion collisions is a crucial theoretical question in understanding the onset of hydrodynamics. One hypothesis to explain the rapid decrease in the degrees of freedom is the concept of a hydro attractor. In existing studies, the hydrodynamical solution shows the attractor behavior with respect to the proper time in Milne coordinate. However, in rapidity dependent systems, there has been no observation of such consistency of different hydrodynamical solutions at later time evolution.

We observe, for the first time, attractor behavior for 1+1D viscous hydrodynamics with general rapidity distribution based on Muller--Isreal--Stewart hydrodynamic theory [1]. This is achieved by redefining generalized attractor variables as a covariant formula of pressure anisotropy and replacing the proper time by the inverse of expansion rate ($1/(\mathcal D_\mu u^\mu)$). We also observe that a rapid expansion in the fluid velocity is essential for a rapid early time attractor.

To verify the attractor behavior evolving with aforementioned redefined variables, we further establish the anisotropic hydrodynamics (aHydro) equations based on a specific boost-non-invariant longitudinally expanding system [2]. Good consistency is also found in the comparison between the aHydro results with those from the analytical solution to the Boltzmann equation under relaxation time approximation [3]. To the best of our knowledge, [2] and [3] are respectively the first exact solution to the Boltzmann equation and aHydro equations that allow longitudinal expansion with broken boost invariance.

Reference:
[1] Shile Chen and Shuzhe Shi, Phys. Rev. C 111 , no.2, L021902 (2025).
[2] Shile Chen and Shuzhe Shi, Phys. Rev. D 111 , no.1, 014001 (2025).
[3] Shile Chen and Shuzhe Shi, Phys.Rev.C 109 (2024) 5, L051901.

Speaker: Chen Shile (Tsinghua University)

陈诗乐-清华大学-Attractor of hydrodynamics with general rapidity distribution.pdf

09:20 Holographic study of quark matter properties and QCD phase diagram

I will introduce some new developments in applying holographic methods to study the properties of QCD matter. These investigations encompass a wide range of topics, including the equation of state of QCD matter, conservation charge perturbations, jet energy loss, quantum entanglement, and other related phenomena. I will also discuss the characteristics of different holographic methods and identify signals that are sensitive to the Critical End Point in the presence of rotation.

Speaker: Zhibin LI (Zhengzhou University)

李志镔-郑州大学-Holographic study of quark matter properties and QCD phase diagram_1745628823.pptx

09:40 Evaluate the magnetic field in heavy-ion collisions by virtual photon polarization and dilepton anisotropy

In weak magnetic field approximation, quark distribution functions are modified linearly by electromagnetic tensor $F_{\mu\nu}$ in Quark Gluon Plasma(QGP). Quarks and anti-quarks tend to move perpendicular to the magnetic field. Hence, in the $q \bar{q}\rightarrow l \bar{l}$ process, momentum and angular momentum conservation will induce the dilepton anisotropy and the virtual photon polarization. Virtual photon polarization is characterized by coefficients $\lambda_{\theta}$ and $\lambda_{\phi}$, which are sensitive to the magnetic field and hydrodynamic behaviors. In the Bjorken flow case and random fluid cell, we find that virtual photon polarization phenomena can obviously reflect the strength of the magnetic field.

Speaker: Dr Minghua Wei (Fudan University)

魏明华-安徽理工大学-通过虚光子极化和双轻子各向异性估计重离子碰撞中的磁场.pdf

08:15 → 10:00 分会场三: 高密核物质

Convener: 卫宁 张 (Harbin Institute of Technology)

08:15 Baryon properties from Continuum Schwinger Function Methods

Speaker: Chen Chen (USTC)

陈晨-中国科学技术大学-Baryon properties from Continuum Schwinger Function Methods.pdf

08:40 QCD相结构和致密星体性质

研究量子色动力学(QCD)相结构是当前核物理学领域的前沿课题之一，对于揭示强相互作用物质在极端条件下的基本性质和演化规律以及深入理解致密星体和早期宇宙的物质形态具有重要意义。此次报告将简单介绍我们团队近期在QCD相结构和致密星体性质取得的一些进展。具体是：1、利用NJL模型计算密度涨落、声速和多方指数，分析这些物理量的临界点附近的特征，解释相对论重离子碰撞中轻核产额比、净质子数涨落等实验结果; 2、探讨致密星体内部物质的基本性质，结合最新的大质量致密星体和引力波观测数据约束，分析大质量致密星体内部是否存在夸克物质核心; 3、探索可能存在的新物质形态(如QCD轴子)对强相互作用物质相变及致密星体性质的影响。

Speaker: Prof. 鹤 刘

2 刘鹤-青岛理工大学-QCD 相结构与致密星体性质.pdf

09:00 Structure, oscillations and gravitational wave of neutron stars

Due to the hot dense environment, quark matter is probably emerge in compact stars, e.g. the cold neutron stars, the hot proto-neutron stars or the remnant of two neutron star merger. At present, it is quite important to look for possible observational signals to distinguish the hybrid stars from normal neutron stars. Concern the recent development in gravitational wave observation, we investigate radial and non-radial oscillations of pure and hybrid neutron stars, as well as proto-neutron stars. We employ equations of state of nuclear matter from Brueckner-Hartree-Fock theory, and of quark matter from the Dyson-Schwinger quark model. For radial oscillations, our results show different character of pure neutron stars and hybrid stars, as well as the behavior during the evolution of proton neutron stars. For non-radial oscillations, characteristic differences between neutron-star and hybrid-star g1-mode oscillation frequencies, damping times, and gravitational wave strains are pointed out. Results of f-mode and the corresponding gravitational wave observable of hybrid stars with pasta structure are also presented.

Speaker: Huan Chen (China University of Geosciences (Wuhan))

陈欢-中国地质大学（武汉）-Structure, oscillations and gravitational wave of neutron stars.pptx

09:20 Effects of chiral symmetry restoration on dilepton production in heavy ion collisions

Because of their weak interactions with the strongly interacting matter produced in relativistic heavy-ion collisions, dileptons provide an ideal probe of the early dynamics of these collisions. Here, we study dilepton production using a partonic transport model that is based on an extended Nambu-Jona-Lasinio (NJL) model. In this model, the in-medium quark masses decrease with increasing temperature as a result of the restoration of chiral symmetry. We find that the extracted temperature from dileptons of intermediate masses agrees well with the temperature of the partonic matter, suggesting that dilepton production can be used as a thermometer for the produced partonic matter. Our results also indicate that the extracted in-medium quark masses decrease with increasing dilepton temperature, implying that dilepton production can further serve as a probe of
chiral symmetry restoration in high energy heavy-ion collisions.

Speaker: 文豪 周 (Fudan University)

周文豪dilepton.pdf

09:40 Collectivity in heavy ion collisions from RHIC - STAR BESII

In heavy-ion collisions, directed flow ($v_1$) and elliptic flow ($v_2$) represent the first and second harmonic coefficients in the Fourier expansion of the final-state particle azimuthal distribution. These coefficients are sensitive to the equation of state (EoS) and the degrees of freedom in the produced medium. Measuring $v_1$ and $v_2$ of identified particles provides a powerful tool for investigating the properties of nuclear matter created in heavy-ion collisions.

With the enhanced statistical datasets from the second phase of the RHIC Beam Energy Scan (BES-II) program at STAR, we will present measurements of $v_1$ and $v_2$ for a range of hadrons, including ${\pi}^{\pm}$, ${K}^{\pm}$, ${K}^{0}{s}$, $p$, $\bar{p}$, ${\phi}$, ${\Lambda}$, $\bar{\Lambda}$, ${\Xi}^{\pm}$, and ${\Omega}^{\pm}$ at $\sqrt{s{NN}}$ = 3.0 - 19.6 GeV.

Additionally, we will present the scaling of the Number of Constituent Quarks (NCQ) for both particles and anti-particles. The NCQ-scaled $v_2$ ratios of ${\pi}^{+}$/${K}^{+}$, $p$/${K}^{+}$, ${\pi}^{-}$/${K}^{-}$, $\bar{p}$/${K}^{-}$, ${\phi}$/${K}^{-}$, ${\Lambda}$/${K}^{0}{s}$, and $\bar{\Lambda}$/${K}^{0}{s}$ will also be discussed over the range of $\sqrt{s_{NN}}$ = 3.0 - 19.6 GeV.

Furthermore, negative $v_1$ slopes for kaons are observed in the low $p_T$ region ($p_T < 0.6$ GeV/c). A comparison with JAM model calculations, both with and without spectators, suggests that the observed kaon anti-flow at low $p_T$ can be explained by the shadowing effect of spectators in non-central collisions within the high baryon density region.

Speaker: 星 吴 (Central China Normal University)

20250427中高能核物理大会 1.pdf

08:15 → 10:00 分会场二: 自旋物理

Convener: Xu-Guang Huang (Fudan University)

08:15 Spin Correlations in unpolarized high energy collisions

While jet quenching in relativistic heavy-ion collisions has been extensively studied over decades, the role of spin in this process remains largely unexplored. Since the QCD jets produced in relativistic heavy-ion collision are unpolarized, it seems to be mission impossible to study the quenching of polarized jets.

In recent works [1-3], we demonstrated that the spin correlation of back-to-back dihadron emerges even in unpolarized collisions, empowering unpolarized experiments to shed light on spin effects. We also extend our approach to relativistic heavy-ion collisions, opening up new avenues for investigating the quenching of polarized jets [4]. This talk presents our finding on both the longitudinal and transverse spin correlations of back-to-back dihadron.

References
[1] H.C. Zhang and S.Y. Wei, Probing the longitudinal spin transfer via dihadron polarization correlations in unpolarized ee and pp collisions, Phys. Lett. B 839 (2023), 137821.
[2] Z.X. Chen, H. Dong and S.Y. Wei, Dihadron helicity correlation in photon-nucleus collisions, Phys. Rev. D 110 (2024), 5.
[3] L. Yang, Y.K. Song and S.Y. Wei, Transverse spin correlation of back-to-back dihadron in unpolarized collisions, arXiv:2410.20917.
[4] X. Li, Z.X. Chen, S. Cao and S.Y. Wei, Correlations of dihadron polarization in central, peripheral, and ultraperipheral heavy-ion collisions, Phys. Rev. D 109 (2024), 014035.

Speaker: Prof. Shu-yi Wei (Shandong University)

魏树一-山东大学-Spin_Correlation.pdf

08:40 Spin polarization in strongly coupled QGP

The shear induced polarization is known to be a significant part of local polarization of Lambda hyperon in heavy ion collisions. Unlike vorticity induced polarization, the shear induced polarization receives significant corrections from collisions and structure model. These effects are two aspects of the same interaction. We use a holographic model to treat them on equal footing. We find novel contributions to polarization entirely of steady state origins.

Speaker: Shu Lin (Sun Yat-Sen University)

林树-中山大学-spin polarization in strongly coupled QGP.pdf

09:00 Spin Alignment, Phase Transition and Transportation of QGP at Finite Temperature in the Presences of Magnetic and Vorticity Fields

We study the two-flavor Nambu-Jona-Lasinio (NJL) model under the rotation and chiral chemical potential μ5.First, the influence of chiral imbalance on the chiral phase transition in the Tpc − ω plane is investigated.In the study of the spin alignment of the vector meson ρ, ρ00 is the 00 element of the spin density matrix of vector mesons. At high temperatures, ρ00 is close to 1/3, which indicates that the spin alignment of the vector meson ρ is isotropic.The inclusion of the anomalous magnetic moments of the quarks at finite density into the NJL model gives rise to additional spin polarization magnetic effects. It is found that both the ratio η/s of shear viscosity coefficient to entropy and the collision relaxation time τ show similar trend with temperature, both of which reach minima around the critical temperature. The shear viscosity coefficient of the dissipative fluid system can be decomposed into five different components as the strong magnetic field exists. The influences of the order of chiral phase transition and the critical end point on dissipative phenomena in such a magnetized medium are quantitatively investigated.

Speaker: 笙琴 冯 (三峡大学理学院)

3. 冯笙琴-三峡大学-Spin Alignment, Phase Transition and Neutral Pseudoscalar.pdf

09:20 Measurement of Lambda(Lambda-bar) hyperons' local spin polarization in Au+Au collisions from the RHIC Beam Energy Scan-II

The second harmonic cosine and sine modulations of the local spin polarization of $\Lambda$($\bar{\Lambda}$) hyperons out-of-plane ($P_{y}$) and in-plane ($P_{z}$), denoted as $P_{2y}$ and $P_{2z}$, respectively, are newly proposed observables for probing spin Hall effect (SHE) driven by the gradient of baryonic chemical potential \cite{liu21, fu2021_she}. $P_{2y}$ and $P_{2z}$ are measured in Au+Au collisions at $\sqrt{s_{NN}} = $ 7.7, 9.2, 11.5, 14.6, 17.3, 19.6 and 27 GeV from the RHIC Beam Energy Scan-II. A monotonic decrease of $P_{2y}$ for $\Lambda$ with increasing collision energy, and smaller positive $P_{2z}$ with hints of sign change at $\sqrt{s_{NN}} = 7.7$ GeV are observed. However, $P_{2y}$ and $P_{2z}$ for $\bar{\Lambda}$ show no significant energy dependence within the large statistical uncertainties. The local polarization components are influenced by thermal vorticity, shear-induced effects, and baryon chemical potential. These measurements provide valuable insights into the spin dynamics of QCD matter in high baryon density environments.

Speaker: Qiang Hu (Institute of Modern Physics,CAS)

胡强-中国科学院近代物理研究所-Measurement of Lambda(Lambda-bar) hyperons' local spin polarization in Au+Au collisions from the RHIC Beam Energy Scan-II.pdf

09:40 Observation of $\Lambda$ hyperon local polarization in pPb collisions at $\sqrt{s_{NN}}= 8.16$ TeV

The observation of hyperon polarization along beam direction ($P_z$) in nucleus-nucleus collisions has opened a new way to study the complex vortical structures of the QGP. With the high-statistics data collected by the CMS experiment, we present the first $P_z$ results for $\Lambda$ and $\bar{\Lambda}$ particles in pPb collision at $\sqrt{s_{NN}}= 8.16$ TeV over a wide transverse momentum ($p_{T}$) and charged particle multiplicity ($N_\mathrm{trk}^\mathrm{offline}$) range. The $P_z$ values decrease as a function of $N_\mathrm{trk}^\mathrm{offline}$, but increase with $p_{T}$. A hydrodynamic model that describes the observed $P_z$ values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the pPb results. These observations pose a challenge to the current theoretical implementation of spin polarization in heavy ion collisions and offer new insights into the origin of spin polarization in hadronic collisions at LHC energies.

Speaker: 辰艳 李 (shandong university)

李辰艳_山东大学_local polarization in pPb.pdf

10:00 → 10:25 茶歇

10:25 → 12:10 分会场一: 理论进展

Convener: Defu Hou (CCNU)

10:25 Non-hydrodynamics from the symmetry principle

Speaker: 伊 尹

Non-hydro-symmetry_YiYin.pdf

10:50 Correlations and fluctuations in a magnetized PNJL model with and without inverse magnetic catalysis effect

The correlation $\chi^{BQ}_{11},\chi^{BS}_{11},\chi^{QS}_{11}$ and fluctuations $\chi^{B,Q,S,T}_2,\chi^{B,Q,S,T}_4$ of baryon number $B$, electric charge $Q$, strangeness number $S$ and temperature $T$ are investigated in a Polyakov loop extended Nambu-Jona-Lasinio (PNJL) model at finite temperature and magnetic field. The inverse magnetic catalysis (IMC) effect is introduced through the magnetic field dependent parameters $G(eB)$, $K(eB)$ or $T_0(eB)$. We will discuss the effect of external magnetic field on these quantities, and make comparison of the results in the cases with and without IMC effect.

Speaker: Prof. 施君 毛 (西安交通大学)

7.毛施君-西安 交通大学-Correlations and fluctuations with and without inverse magnetic catalysis effect (2).pdf

11:10 Temperature Dependence of Heavy Quark Diffusion from 2+1-Flavor Lattice QCD

We present a lattice dtermination of the heavy quark diffusion coefficient in 2+1 flavor QCD with almst physical quark masses in a wide temperature range. The momentum and spatial diffusion coefficients are extracted for a wide temperature range from $T=153$ MeV to $10$ GeV. The results are in agreement with previous work from the HotQCD collaboration and show fast thermalization of the heavy quark inside the QGP. Close to the chiral crossover temperature $T_c\simeq150$ MeV our results are close to the AdS/CFT bound calculated at strong coupling.

Speaker: Hai-Tao Shu

舒海涛-华中师范大学-Temperature Dependence of Heavy Quark Diffusion from 2+1-Flavor Lattice QCD.pdf

11:30 Pion and Kaon Condensation from Holographic QCD

The properties of QCD matter at finite isospin and strangeness densities are investigated employing holographic soft-wall AdS/QCD models. It is confirmed that at high enough isospin densities, charged pions start to condense and the pion superfluid phase appears in the system. It is shown that the chiral condensate and the pion condensate can be transformed to each other and form a `chiral circle' in the superfluid phase. We derived the Equation of State (EoS) for pionic matter, calculated the normalized trace anomaly $\Delta$ and $(\epsilon-3p)/m_\pi^4$, and analyzed the sound speed and adiabatic index. Additionally, we provided data on the mass-radius relation and the tidal deformability of pion stars. The results indicate that holographic models align well with lattice QCD concerning isospin density, axial-vector condensation, EoS, and trace anomaly, though discrepancies in sound speed and adiabatic index emerge at higher isospin chemical potentials. The holographic models closely match those from the chiral perturbation theory ($\chi$PT), suggesting that they can be considered as five-dimensional description of $\chi$PT.

Speaker: Yidian Chen (Hangzhou Normal University)

9.陈亦点-pion and kaon condensation from holographic QCD.pptx

11:50 利用推广的 NJL模型研究高密物质

We propose a new theoretical framework to investigate the properties of baryonic matter, quark matter, and their mixed phases based on an extended Nambu-Jona-Lasinio(eNJL) model, where the Dirac sea, the spontaneous chiral symmetry breaking, and the quark degrees of freedom are considered by extending the SU(3) NJL model and treating baryons as clusters of quarks. The eNJL model can then be readily adopted to examine the matter states ranging from baryonic matter to quark matter in a unified manner, which will be illustrated in this talk.

Speaker: 铖君 夏 (扬州大学)

10. 夏铖君-properties of dense stellar matter in an extended NJL model.pptx

10:25 → 12:15 分会场三: QCD与新物理

Convener: Ben-Wei Zhang (Central China Normal University)

10:25 Fundamental Asymmetry in the neutron nuclei interaction

Speaker: 瑞睿 樊 (高能所)

Fundamental symmetry violation in the neutron nuclei interaction.pdf

10:50 Recent Results of Baryon Electromagnetic Form Factors at BESIII

The electromagnetic probe offers a distinctive approach to exploring baryon structure. Within the baryon octet, only protons and neutrons can be directly studied through scattering experiments, while the remaining baryons require investigation via positron-electron annihilation experiments, which are constrained by their lifetimes. Utilizing collision data with an integrated luminosity of approximately 688.5 pb^-1 in the center-of-mass energy range of 2.0000 to 3.0800 GeV, collected by the third-generation Beijing Spectrometer (BESIII), the BESIII Collaboration has precisely measured the electromagnetic form factors of various baryons, for instance, the time-like electromagnetic form factor of neutrons. This report reviews recent experimental progress in this field.

Speaker: jifeng hu (South China Normal University)

7 胡继峰-baryon form factors TL JifengHu20250427.pptx

11:15 Spin polarization impact on QCD critical point

Spin polarization, as a novel method for detecting the rotational properties of QGP which are produced in relativistic heavy-ion collisions, has attractd great interest. We study the impact of parton spin polarization on the effective transport and thermodynamic coefficients and the QCD critical point in non central light- and heavy-ion collisions. By employing the novel kinetic theory method, we found that the transport and thermodynamic coefficients, i.g, speed of sound squared $c_{s}^{2}$, specific shear viscosity $\eta/s$, specific bulk viscosity $\zeta/s$, and mean of free path $\lambda$, are significantly affected by spin polarization. The spin polarization impact on $\eta/s$ and $\lambda$ show that monotonic dependent on collision energy in terms of both the radius and temperature. While the spin polarization impact on $c_{s}^{2}$ and $\zeta/s$ exhibit that non-monotonic dependent on collision energy in terms of both the radius and temperature. The non-monotonic behavior suggests that spin polarization can serve as an effective probe for the critical point of the QCD phase transition.

References
[1] De-Xian Wei, Wei-Tian Deng, and Xu-Guang Huang. Thermal vorticity and spin polarization in heavy-ion collisions. Phys. Rev. C 99, 014905 (2019).
[2] De-Xian Wei. Spin polarization as a probe of QCD critical point. Submitted to Phys. Rev. Lett. (2025).
[3] De-Xian Wei. Spin polarization impact on QCD critical point. Submitted to Phys. Lett. B (2025).

Speaker: 德贤 韦 (Guangxi University of Science and Technology)

11:35 Critical spin fluctuation near CEP

We discuss the impact of phase transitions on quark spin fluctuation and correlation. We propose that quark-antiquark correlation which related to vector meson spin alignment and Hyperon spin correlation can serve as a signature of CEP. Using the (p)NJL model, we qualitatively study the properties of quark-antiquark spin correlation. Our findings reveal a peak structure near the CEP, which could serve as an experimental signature of the CEP and explain the non-monotonic behavior of meson alignment at low collision energies.

Speaker: 浩磊 陈 (复旦大学)

陈浩磊-复旦大学-critical spin fluctuation near CEP.pdf

11:55 Energy dependence of transverse momentum fluctuations in Au+Au collisions from a multiphase transport model

Event-by-event mean transverse momentum fluctuations ($p_\mathrm{T}$) serve as a sensitive probe of initial state overlap geometry and energy density fluctuations in relativistic heavy-ion collisions. We present a systematic investigation of $p_\mathrm{T}$ fluctuations in Au+Au collisions at $\mathrm{\sqrt{s_{NN}}}$ = 3.0–19.6 GeV, examining their centrality and energy dependence with the framework of an improved multiphase transport (AMPT) model. The centrality dependence of the $p_\mathrm{T}$ cumulants up to fourth order deviates significantly from simple powering-law scaling.
Scaled cumulants are performed, with variances aligning well with the trends observed in the experimental data. Employing a two-subevent method, short-range correlations are slightly suppressed compared to the standard approach. Furthermore, baryons exhibit more pronounced $\langle p_\mathrm{T}\rangle$ fluctuations than mesons, potentially attributable to the effect of radial flow. These results provide referenced insights into the role of initial state fluctuations across different energies in heavy-ion collisions.
Please see the details using the DOI: https://doi.org/10.1103/PhysRevC.111.024911.

Speaker: Dr Liuyao Zhang (Institute of Nuclear Science and Technology, Henan Academy of Sciences)

MeanpTFlu_Liuyaozhang_Apr272025.pdf

10:25 → 12:10 分会场二: 喷注与重味物理

Convener: Guang-You Qin (Central China Normal University)

10:25 重子衰变中的CP破坏

我们提出了一种新的CP破坏机制，在重味重子衰变中通过末态Nπ重散射可以产生比较大的CP破坏，它达到了使用当前LHCb数据即可发现的程度。

Speaker: Fu-Sheng Yu (Lanzhou University)

BaryonCPV-FSY.pdf

10:50 ALICE实验重味夸克偶素的测量

Quarkonium production is a direct probe of deconfinement in heavy-ion collisions. For J/$\psi$, a bound state of ${c}\bar{c}$ quarks, the (re-)generation is found to be the dominant production mechanism at low transverse momentum ($p_{\rm T}$) and in central collisions at the LHC energies.In addition, the non-prompt component of J/$\psi$ production from b-hadron decays allows one to access the interaction of b-hadrons with the QGP down to low transverse momentum.

In this talk, the ALICE recent measurements of the quarkonium production in pp and Pb-Pb collisions will be shown. All the results will be compared with model calculations.

Speaker: Xiaozhi Bai (University of Science and Technology of China)

白晓智-中国科学技术大学-ALICE实验重味夸克偶素的测量.pdf

11:10 喷注淬火的系统尺寸依赖性研究

喷注淬火效应作为夸克胶子等离子体产生的关键实验证据之一，是本领域的重点研究课题。在大碰撞系统金核-金核和铅核-铅核中，喷注淬火效应已得到证实和广泛研究，但是在小系统质子-金核和质子-铅核碰撞中尚未看到实验信号。因此，喷注淬火的碰撞系统尺寸依赖性是本研究领域中尚未解答的核心问题。同质异位素碰撞和氧核-氧核的系统尺寸正好介于金核-金核与小系统碰撞之间，因此同质异位素和氧核-氧核碰撞中的喷注淬火实验测量，有望给出喷注淬火效应的临界尺寸，揭示部分子能量损失与热密介质大小的依赖关系。本报告中，我将展示同质异位素碰撞和氧核-氧核中强子核修正因子和高能粒子触发喷注的最新实验测量结果。同时，我会讨论近期实验中观测到的高能粒子触发喷注的核修正因子IAA在高横动量区域出现明显上升趋势且超过基准值1的实验结果，并给出定性解释。

Speaker: Maowu Nie (Shandong University)

20250427_Shanghai.pdf

11:30 Flavor Hierarchy of Jet Energy Correlators inside the Quark-Gluon Plasma

Heavy flavor jets provide ideal tools to probe the mass effect on jet substructure in both vacuum and quark-gluon plasma (QGP). Energy-energy correlator (EEC) is an excellent jet substructure observable owning to its strong sensitivity to jet physics at different scales. We perform a complete realistic simulation on medium modification of heavy and light flavor jet EEC in heavy-ion collisions. A clear flavor hierarchy is observed for jet EEC in both vacuum and QGP due to the mass effect. The medium modification of inclusive jet EEC at different angular scales exhibits very rich structure: suppression at intermediate angles, and enhancement at small and large angles, which can be well explained by the interplay of mass effect, energy loss, medium-induced radiation and medium response. These unique features of jet EEC are shown to probe the physics of jet-medium interaction at different scales, and can be readily validated by upcoming experiments.

Speaker: Dr Wen-Jing Xing (South China University)

9. 邢文静-南 华大学-Flavor hierarchy of jet energy correlators inside quark-gluon plasma.pdf

11:50 Exploring the elliptic anisotropy of hard probes in small collision systems

The hard probes, including jets and heavy flavors, play an important role in investigating the properties of quark–gluon plasma (QGP) formed in heavy-ion collisions. The positive elliptic flow of hard probes observed in semi-central Pb--Pb collisions indicates that the hard partons suffered strong interactions in the deconfined QCD medium and then obtain the collectivity. However, recent measurements show also a non-zero $v_{2}$ for high-$p_{\mathrm{T}}$ charged particles and heavy flavor hadrons in high-multiplicity p--Pb collisions for both mid and forward rapidities, whose origin is still debated.

In this contribution, we employ a multi-phase transport model (AMPT) to calculate the $v_{2}$ of jet particles and open heavy-flavour hadron decay muons in p--Pb collisions at mid and forward rapidity, respectively. The results are obtained using the two-particle correlation method and the advanced nonflow subtraction strategy. We will systematically introduce how the collectivity of hard partons are generated from parton scatterings, and then propagated to the final state in small collision systems. Comparisons with experimental results will be presented as well. This work will provide further insights into understanding the origin of elliptic anisotropy of hard probes in small collision systems, and has referential value for the future measurements.

Speaker: Dr 思宇 汤 (武汉纺织大学)

10. 汤思宇-武汉纺织大学-Exploring the elliptic anisotropy of heavy flavors in small collision systems at LHC.pdf

12:15 → 14:30 午餐

14:30 → 16:00 主会场: 报告

Convener: Enke Wang (South China Normal University)

14:30 Electromagnetic effect on particle production

Speaker: Pengfei Zhuang (Tsinghua University)

EM_Effect_ZhuangPF.pptx

15:00 UPC Physics

Speaker: 王妹 查 (中国科学技术大学近代物理系)

查王妹-中科大-UPC_physics.pptx

15:30 混杂态与胶球

Speaker: Beijiang LIU (高能所)

BJLiu_20250427.pdf

16:00 → 16:30 茶歇

16:30 → 18:00 主会场: 报告

Convener: Qun Wang (University of Science and Technology of China)

16:30 奇特强子态

Speaker: Yuping GUO (Fudan University)

郭玉萍-复旦大学-奇特强子态.pdf

17:00 核子短程关联前沿进展

Speaker: Zhihong Ye (Tsinghua University)

叶志鸿-清华大学-短程关联研究进展.pdf

17:30 Experimental progress of the chiral magnetic effect in heavy-ion collisions

Speaker: 迪宇 申 (上海应用物理研究所)

6 申迪宇-IMP-CMEOverview.pdf

18:00 → 20:30 晚餐

喜来登酒店一楼和二楼自助餐厅

Monday, 28 April

08:30 → 10:00 主会场: 报告

Convener: Lie-Wen Chen (S)

08:30 HIAF physics

Speaker: Nu Xu (CCNU)

1 许怒- HIAF Physics.pptx

09:00 基于PandaX深地液氙实验的稀有衰变搜寻

Speaker: 少博 王 (Shanghai Jiao Tong University)

PandaX稀有衰变搜寻-王少博 - 20250428.pptx

09:30 无中微子双beta衰变

Speaker: 昊 陈 (复旦大学-现代物理研究所)

3 陈昊-复旦大学-无中微子双贝塔衰变的探索.pdf

10:00 → 10:30 茶歇

10:30 → 12:15 主会场: 报告

Convener: Guoliang Ma

10:30 Heavy flavor physics

Speaker: Min He (Nanjing University of Science & Technology)

4 何敏-南京理工大学-Heavy quark probes of the QCD matter a theoretical perspective.pdf

11:00 Jet physics in heavy-ion collisions

Speaker: Shanshan Cao (Shandong University)

曹杉杉-山东大学-Jet physics in heavy-ion collisions.pdf

11:30 Flash Talks

flash talk.pdf

12:00 闭幕式

12:15 → 14:15 午餐

喜来登酒店一楼和二楼自助餐厅