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重子物理与CP破坏研讨会-Workshop on Baryon Physics and CP Violation

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Description

重子物理与 CP 破坏研讨会（Workshop on Baryon Physics and CP Violation）将于2025 年 12 月 12 日至 15 日在浙江省杭州市国科大杭州高等研究院召开。

近期，LHCb 实验首次观测到重子衰变中的 CP 破坏信号，标志着重子 CP 破坏研究进入精确测量的新阶段，已成为味物理与标准模型检验的重要前沿方向之一。本次研讨会旨在汇聚从事重子物理与 CP 破坏相关研究的理论和实验物理学家，交流最新研究成果，探讨现有及未来实验（如 Belle II、BESIII、LHCb、STCF 等）在该领域的发展机遇与面临的挑战。

本次会议拟涵盖（包括但不限于）以下研究主题：
  • 重子衰变与 CP 破坏
  • 重子物理在新物理搜寻中的角色（例如 EDM、稀有衰变、有效场论描述）
  • 相关实验设施的现状与未来规划
  • 重子与介子体系中的味对称（如 SU(3)、U-spin）及其破坏
  • 格点 QCD 与非微扰方法在重子物理中的应用
会议组委会特邀请您参加本次研讨会！

会议有关事项如下：
会议时间：2025 年 12 月 12 日至 15 日，其中12日报到注册，15日离会。
会议地点：国科大杭州高等研究院3号楼2A223报告厅
会议网站：https://indico-tdli.sjtu.edu.cn/event/4553/
会议注册费：教职人员/博士后800 元/人，学生500元/人，会议统一安排食宿。
住宿地点：国科大杭州高等研究院7号楼专家公寓（国科郡亭酒店）
报告以受邀为主，同时欢迎有意者提交申请。

会议组委员：
耿朝强（cqgeng@ucas.ac.cn）
韩＿超（hbarc@ucas.ac.cn）
靳湘楠（xnjin@ucas.ac.cn）
刘佳韦（17826894932，chiaweiliu@ucas.ac.cn）

会议秘书：
王＿静（17280167326，SLXY@ucas.ac.cn）

【会议手册】重子物理与CP破坏研讨会.pdf
【会议通知】盖章扫描版.pdf
入园通行证.png
参会证明.pdf
重子物理与CP破坏研讨会照片.zip
Participants
  • Chengping Shen
  • Chong Chung Lih
  • Fanrong Xu
  • Hai-Yang Cheng
  • Huiqiang Shang
  • Longke Li
  • Na Li
  • Pei-Rong Li
  • Qi-An Zhang
  • Shan Cheng
  • Sheng-Lin Liu
  • Xiao Yu
  • Yuji Shi
  • Zhen-Yang(振洋) Wang(王)
  • 业元 巫
  • 亚 李
  • 佳杰 韩
  • 佳韦 刘
  • 健 柴
  • 兴博 袁
  • 冰博敏 尚
  • 君豪 刘
  • 嘉宇 梁
  • 岚滨 李
  • 心怡 刘
  • 志清 张
  • 斌 吴
  • 新强 李
  • 春辉 刘
  • 昱程 王
  • 朝强 耿
  • 权宜 胡
  • 泓鉴 王
  • 泽辉 卢
  • 洁晟 俞
  • 湘楠 靳
  • 瑞林 朱
  • 瑞祥 史
  • 磊毅 李
  • 福升 于
  • 苏平 金
  • 衡讷 李
  • 赛雅 张
  • 超琪 张
  • 跃红 谢
  • 逸扬 汪
  • 金林 傅
  • 钰瑶 吉
  • 锐 周
  • 雨桐 刘
  • 颖 王
  • +34
Contact
  • Friday, 12 December
    • 14:00 → 20:00
      报到: 7号楼专家公寓（国科郡亭酒店）前台

      8号楼前台

  • Saturday, 13 December
    • 08:30 → 09:40
      Session 1
      Convener: Chia-Wei Liu
      • 08:30
        Recent Theoretical Advances in Baryon CP Violation 40m
        Speaker: Fu-Sheng Yu (Lanzhou University)
        BaryonCPV-FSY.pdf
      • 09:10
        Observation of CP violation in baryon decays 30m
        Speaker: Shanzhen Chen (IHEP, CAS)
        Shanzhen_CPVinbaryon_v1.pdf
    • 09:40 → 10:10
      合影和茶歇 30m
    • 10:10 → 11:40
      Session2
      Convener: Fu-Sheng Yu (Lanzhou University)
      • 10:10
        Recent results from Belle II 30m
        Speaker: Chengping Shen (Fudan University)
        Chengping_Shen.pdf
      • 10:40
        Recent LHCb results on baryonic B decays 20m

        This talk is to cover the following recent LHCb results based on full or part of Runs1-2 data sets: first observation of $B^0\to p \bar p p \bar p$, and evidence of $B^0_s\to p \bar p p \bar p$; first observation of $B^+\to \bar\Lambda p \bar p p$, and study of threshold enhancement effects in the final state; first observation of $B^+\to \bar\Lambda p$, and measurement of its decay parameter; first evidence of FCNC decay of $B^+\to \bar\Lambda p \mu^+\mu^-$. The prospects of studying other baryonic decays, especially those with a final-state $\bar \Lambda p$ pair, will also be discussed.

        Speaker: Prof. Liang Sun (Wuhan University)
        B2LpX_LHCb_LSun_20251213.pdf
      • 11:00
        Search for hyperon EDM at BESIII 20m
        Speaker: Jinlin Fu (UCAS)
        重子物理与CP破坏研讨会-傅金林.pdf
      • 11:20
        Belle II实验上粲重子和CP破坏的研究 20m

        I will present the studies of charmed baryons and searches for CP violation at Belle II experiment......

        Speaker: Dr Longke Li (Hunan Normal University)
        lilongkeBaryonCPV.pdf
    • 11:40 → 13:40
      午餐时间 2h
    • 13:40 → 15:20
      Session3
      Convener: Yanxi Zhang (Peking university)
    • 15:20 → 17:30
      自由讨论 2h 10m
    • 17:30 → 20:00
      晚宴；原野餐厅（西湖区双浦镇下杨村418号） 2h 30m

      原野餐厅（西湖区双浦镇下杨村418号）

  • Sunday, 14 December
    • 08:30 → 09:50
      Session4
      Convener: Chao-Qiang Geng (Hangzhou Institute for Advanced Study, UCAS)
    • 09:50 → 10:20
      茶歇 30m
    • 10:20 → 11:40
      Session5
      Convener: Ruilin Zhu
      • 10:20
        Charm Chromo-EDM as a Probe of Top-quark FCNC interactions 20m

        Electric dipole moments (EDMs) provide strong bounds on the CP structure of many New Physics (NP) scenarios. In this work, we study the charm Chromo-EDM (CEDM) within a new light scalar singlet with top-quark Flavour-Changing Neutral Current (FCNC) interactions. Such scalar singlet appears naturally in many well-motivated NP scenarios, such as the composite Higgs models. Unlike the Higgs boson in the Standard Model, it can induce large FCNCs in the top sector. Besides the CEDM, we also include the low-energy constraints from the $B_s \to \mu^+ \mu^-$ decay and the muon anomalous magnetic moment $(g-2)_\mu$. We also perform a detailed Monte-Carlo simulation of the channel $pp \to t S +j$ with $S \to \mu^+ \mu^-$ and $S \to b \bar b$, and investigate the LHC sensitivity to the $tcS$ couplings. For the CP-violating $tcS$ couplings $y_{R,L}^{ct}=|y_{R,L}^{ct}|e^{i\theta_{R,L}}$, it is found that the CEDM can provide bounds on the phase difference $\theta_L-\theta_R$, while the CP observables $\mathcal{A}_{\Delta\Gamma_s}^{\mu\mu}$ and $\mathcal{S}_{\mu\mu}$ of the $B_s \to \mu^+ \mu^-$ decay are sensitive to the phase $\theta_R$. Therefore, they are complementary to each other in probing the CP phases of the $tcS$ couplings.

        Speaker: 兴博 袁 (华中师范大学)
        slides.pdf
      • 10:40
        Normalization of partial wave CP asymmetries in three-body decays of heavy hadrons 20m

        CP violation in hadronic multi-body decays has been extensively studied, and the experimental breakthrough in the heayy baryon sector was made recently.
        Partial-Wave CP Asymmetries (PWCPAs) in multi-body decays of heavy hadrons, which although provide us with more interference information, suffer from the
        normalization problem, as is pointed out in this paper.
        We propose a novel solution to this problem.
        %We redefine the PWCPAs in such a way that they can be approximately normalized by a set of normalization factors.
        We introduce a set of extra factors to rescale the PWCPAs to the proper sizes.
        Instead of determining the set of factors according to the normalization requirement, we demand that all the PWCPAs have the same statistical errors.
        %These factors are further determined based on reasonable guidelines.
        In this way, we obtain a set of quasi-normalized PWCPAs, in the sense that they are close to the ideal normalized ones.
        As an application, we perform an analysis of PWCPAs in the decay channel $B^\pm\to\pi^+\pi^-\pi^\pm$. We focus on the phase space region where the invariant mass of the $\pi^+\pi^-$ pair varies around the vector resonance $\rho^0(1450)$. Based on the data of the LHCb collaboration, the interference patterns among the resonances $\rho^0(1450)$, $f_2(1270)$, and $f_0(1500)$ and their contributions to the quasi-normalized PWCPAs are analyzed.
        The analysis indicates that the quasi-normalized PWCPAs can avoid potential misleading or distorted results comparing with some other alternatively defined ones.

        Speaker: Zhen-Yang(振洋) Wang(王) (宁波大学)
        normalizationPWCPA1212@HZ.pdf
      • 11:00
        Progress of light hadron lightcone structures for heavy hadron decays on LQCD 20m

        The lattice QCD computation of parton distributions within the framework of large momentum effective theory (LaMET) constitutes a first-principles approach to studying hadron structures. Building upon preceding studies on meson systems, we have developed and partly implemented lattice methodologies for calculating the leading twist LCDAs of light baryons under the LaMET formalism over the past few years. In this talk, we will introduce our series of works on the ab initio determination of leading-twist LCDAs of light baryons and present preliminary numerical results. We will discuss the complexities involved in lattice calculations of baryonic systems compared to mesonic systems and report some techniques developed and employed recently to achieve physical results for the more intricate baryonic systems, including special operator selections, the hybrid renormalization scheme, and Fourier inversion strategies.

        Speaker: Jun Hua (South China Normal University)
        1214杭州.pdf
      • 11:20
        CP violation of two-body b baryon decays in PQCD 20m
        Speaker: 亚 李
        CPV of two-body b baryon decays in PQCD.pdf
    • 11:40 → 13:40
      午餐 2h
    • 13:40 → 15:00
      Session6
      Convener: Fanrong Xu
      • 13:40
        Hyperon EDM at the J/ψ threshold 20m

        CP violation (CPV) is one of the key ingredients for our understanding of the baryon asymmetry. Despite its observation in kaons, B and D mesons, as well as recently the neutral Lambda b baryon, CPV has not yet been observed in hyperons. Using the 10 billion J/ψ events accumulated so far at BESIII and the hyperonic decay, we discuss the prospect of CPV exploration at the BESIII and beyond such as the STCF.

        Speaker: Yong Du (IMP CAS)
        HIAS-YongDu.pdf
      • 14:00
        On the equivalence of Flavor SU(3) analyses of B to PP decays 20m

        We conduct an SU(3) analysis of $B\to PP$ decays based on reduced matrix elements (RMEs), with $P$ being a light pseudoscalar meson excluding $\eta^{(\prime)}$. We show that a complete basis for the $B\to PP$ decays consists of ten RMEs, where the three RMEs arise from the electroweak penguin operators $O_{7,8}$. In the Standard Model, the relevant Wilson coefficients are small and thus can be neglected. We further demonstrate the equivalence of the RME approach with the irreducible representation amplitude (IRA) and topological diagram amplitude (TDA) methods, and derive relations between the ten RME amplitudes and corresponding IRA/TDA amplitudes. These relations lay a foundation for consistent SU(3) analyses of heavy meson decays.

        Speaker: Yuji Shi (华东理工大学)
        杭州报告-shiyuji.pptx
      • 14:20
        hyperon weak radiative decays in Light front approach 20m

        Motivated by recent experimental data on $\Sigma^+\to p\gamma$ at BESIII, we investigate a class of hyperon weak radiative decays.
        To estimate these processes, in our research, we employ a new type of light-front quark model with a three-quark picture for octet baryons.
        In the three-quark picture, with the use of $SU(3)_f$ and spin symmetries, we present a general form of the light front wave function for each octet baryon.
        By including contributions from the penguin diagram and W exchange diagram, we perform a complete calculation on the branching ratios ($Br$) and the asymmetry parameter ($\alpha$) for hyperon weak radiative decay processes.
        Our results are helpful for discovering additional hyperon weak radiative decay processes in experimental facilities, and our research will promote the theoretical study of baryons.

        Speaker: zhi-peng Xing (Nanjing Normal University)
        radiative——邢志鹏.pdf
      • 14:40
        基于有效场论方法的超子弱衰变研究 20m

        超子是含有奇异夸克的重子，其弱衰变主要分为三类：非轻衰变、辐射衰变以及半轻衰变。这些衰变过程是精确检验粒子物理标准模型以及寻找超出标准模型新物理的理想场所。超子弱衰变中，长久以来相关物理量的实验值与理论预言存在较大差异，一直是粒子物理研究的焦点问题之一，被称为超子弱衰变疑难。由于以前的实验数据有限且精度不够，致使当时的理论研究无法考虑部分可能起重要作用的贡献。近些年，BESIII实验多次测量了各种超子的弱衰变过程，积累了丰富的实验数据，并且发现部分测量值远离以前的实验值，这为理论上重新研究超子弱衰变疑难提供了机会。本报告主要介绍基于协变重子手征微扰理论和低能有效哈密顿量方法研究超子弱辐射衰变、半轻衰变以及非轻衰变的最新进展。

        Speaker: Mr 瑞祥 史 (广西师范大学)
        基于有效场论方法的超子弱衰变研究.pdf
    • 15:00 → 15:30
      茶歇
    • 15:30 → 16:50
      Session7
      Convener: Peirong Li
  • Monday, 15 December
    • 08:00 → 17:00
      离会 9h
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