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# 强子物理新发展研讨会

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# 强子物理新发展研讨会（Online)

2020年4月24日-26日网络会议报告

Satoshi Nakamura（中国科学技术大学）

https://meeting.tencent.com/s/50Nxo6P8a3e4

Go to day
• Friday, April 24, 2020
• 08:50 - 09:00 会议开幕 10'
• 09:00 - 09:45 BESIII上超子物理及其CP破坏实验研究进展 45'
The CKM mechanism for CP violation in the Standard Model (SM) fails to explain the matter-antimatter asymmetry of the Universe by more than 10 orders-of-magnitude. This suggests that additional CP violating processes occur, and motivates aggressive searches for new, non-SM sources of CP violation.  To date, CP violation in hyperon decays have never been observed. Standard Model CP violations in hyperon decays are expected to be ∼ 10^-4 to 10^-5, and  any value higher than this level would be a signature of new, beyond the SM physics.
Currently BESIII has collected about 10 billion J/psi decay events, the decay rate of J/psi to hyperon-anti-hyperon pairs are 10^-3, which indicates that the produced hyperon pairs will be a few millions.  In this talk I will present the first observation of transverse polarization of hyperon-anti-hyperon from the e+e- --> J/psi --> hyperon-anti-hyperon pairs, which allows us to measure the decay asymmetry  parameters of both hyperon and anti-hyperon, therefore CP asymmetry in the hyperon decay can be precisely  obtained with 5 dimensional fit to data. We expect that the study of hyperon physics will be the next frontier of the SM CP searches.
 Speaker: Prof. Hai-Bo Li (IHEP) Material:
• 09:50 - 10:35 Belle实验上奇异粲介子对系统的研究 45'
Belle实验上奇异粲介子对系统的研究
 Speaker: 森 贾 (Beihang University) Material:
• 10:40 - 11:25 The newly observered Omega(2012) as a KbarXi(1530) hadronic molecule 45'
Recently, Belle collaboration measured the ratios of the branching fractions of the newly observed $\Omega(2012)$ excited state. They did not observe significant signals for the $\Omega(2012) \to \bar{K} \Xi^*(1530) \to \bar{K} \pi \Xi$ decay, and reported an upper limit for the ratio of the three body decay to the two body decay mode of $\Omega(2012) \to \bar{K} \Xi$. In this work, we revisit the newly observed $\Omega(2012)$ from the molecular perspective where this resonance appears to be a dynamically generated state with spin-parity $3/2^-$ from the coupled channels interactions of the $\bar{K} \Xi^*(1530)$ and $\eta \Omega$ in $s$-wave and $\bar{K} \Xi$ in $d$-wave. With the model parameters for the $d$-wave interaction, we show that the ratio of these decay fractions reported recently by the Belle collaboration can be easily accommodated.
 Speaker: Prof. 聚军 谢 (中国科学院近代物理研究所) Material:
• 14:30 - 15:15 Why DSEs? 45'
Why DSEs?
 Speaker: 雷 常 (Nankai University)
• 15:20 - 16:05 Hadron Structure on the Light-front 45'
In this talk I will report our recent progress on the structure of light mesons, heavy quarkonia and the nucleon studied in a basis light-front approach. I will present the preliminary results on the observables such as the form factors, the parton distribution function and the generalized parton distribution functions of these systems.
 Speaker: Xingbo Zhao (Iowa State University) Material:
• 16:10 - 16:55 Dibaryons and pentaquarks in quark models 45'
Dibaryons and pentaquarks in quark models
 Speaker: Prof. Hongxia Huang (Nanjing Normal University) Material:
• Saturday, April 25, 2020
• 09:00 - 09:45 BESIII实验上的粲强子衰变研究 45'
BESIII实验上的粲强子衰变研究
 Speaker: Prof. Xiao-Rui Lyu (University of Chinese Academy of Sciences) Material:
• 09:50 - 10:35 Recent results on hadron spectroscopy at LHCb 45'
I will present several new results on observations of excited baryons at LHCb
 Speaker: Liming Zhang (Tsinghua University) Material:
• 10:40 - 11:25 Decay properties of molecular states 45'
Decay properties of molecular states
 Speaker: 殿勇 陈 (东南大学)
• 14:30 - 15:15 ssss四夸克态 45'
本次报告准备介绍我们使用QCD求和规则研究ssss四夸克强子态的一些情况。在研究工作中，我们构造了所有可能的试探流，然后考虑了这些试探流的混合，得到的结果和相关实验进行了比较。
 Speaker: Dr. Hua-Xing Chen (Beihang University) Material:
• 15:20 - 16:05 Solution to the Y problem 45'
Solution to the Y problem
 Speaker: 俊璋 王 (Lanzhou University)
• 16:10 - 16:55 1-+奇特态 45'
1-+奇特态
 Speaker: 相坤 董 (UCAS) Material:
• Sunday, April 26, 2020
• 09:00 - 09:45 Jetomography of QGP in heavy-ion collisions 45'
Jetomography of QGP in heavy-ion collisions
 Speaker: Prof. Xin-Nian Wang (Central China Normal University/Lawrence Berkeley National Laboratory) Material:
• 09:50 - 10:35 BESIII上的超子极化研究 45'
BESIII上的超子极化研究
 Speaker: Dr. Rong-Gang Ping (高能所) Material:
• 10:40 - 11:25 DDK 3-body system in Lattice QCD 45'
The lattice QCD simulation has been generating 3-body hadron spectrum already. The finite volume analysis is necessary to translate these lattice spectra in a finite volume to physical information in the infinite volume. Based on non-relativistic effective field theory, we show the preliminary result of lattice spectrum for DDK 3-body system. In the work, the 2-body information is input referring to arXiv:1906.11995. And 3-body bound state predicted by arXiv:1906.11995 is reproduced in effective field theory. The lattice spectra both below and above threshold are given. They can be compared with future lattice 3-body simulation.
 Speaker: Dr. Jin-Yi Pang (University of Shanghai Science and Techology) Material:
• 14:30 - 15:15 Lattice calculation of hadron structure: parton distribution functions 45'
In this talk, I will introduce the new method of using Lattice QCD to simulate the Parton distribution functions.
 Speaker: Prof. Wei Wang (Shanghai JiaoTong University)
• 15:20 - 16:05 Identifying the $\Sigma_b(6097)$, $\Xi_b(6227)$ and $\Omega_b$ as P-wave bottom baryons 45'
In this talk, I would like to report our recent studies on spectra and decay properties of the excited bottom baryons, $\Sigma_b(6097)$, $\Xi_b(6227)$ and four narrow $\Omega_b$ states, which were newly discovered by LHCb collaboration. At first, we calculated the spectra of P-wave bottom baryons by using the QCD sum rule. The estimations are well consistent with the experimental results. Then We also utilized the method of light−cone sum rules, which is widely used to study the hadron decays in recent years. Our estimations suggest that the bottom baryons $\Sigma_{b}(6097)^{\pm}$ and $\Xi_{b}(6227)^-$ both belong to the P−wave bottom baryon doublet $[\mathbf{6}{F},2,1,\lambda]$, whose color is symmetric $\mathbf{6}_{F}$, the total angular momentum of light system is 2, the spin of light system is 1, and it is $\lambda$−type excitation. And the four narrow $\Omega_b$ states can also be explained as the P-wave bottom baryons but belong to different excitation types. We also made some other predictions.
 Speaker: Dr. Er-Liang Cui (Northwest A&F University) Material:
• 16:10 - 16:55 Triangle singularity appearing as an X(3872)-like peak in $B\to(J/\psi \pi+ \pi-)K\pi$ 45'
Triangle singularity appearing as an X(3872)-like peak in $B\to(J/\psi \pi+ \pi-)K\pi$
 Speaker: Dr. Satoshi Nakamura (Universidade Cruzeiro do Sul) Material:
• 17:00 - 17:10 闭幕式 10'  Speaker: Hai-Ping Peng (USTC)