会议开幕

BESIII上超子物理及其CP破坏实验研究进展

• Hai-Bo Li (IHEP)

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.

Belle实验上奇异粲介子对系统的研究

• 森 贾 (Beihang University)

Belle实验上奇异粲介子对系统的研究

The newly observered Omega(2012) as a KbarXi(1530) hadronic molecule

• 聚军 谢 (中国科学院近代物理研究所)

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.

Why DSEs?

• 雷 常 (Nankai University)

Why DSEs?

Hadron Structure on the Light-front

• Xingbo Zhao (Iowa State University)

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.

Dibaryons and pentaquarks in quark models

• Hongxia Huang (Nanjing Normal University)

Dibaryons and pentaquarks in quark models

BESIII实验上的粲强子衰变研究

• Xiao-Rui Lyu (University of Chinese Academy of Sciences)

BESIII实验上的粲强子衰变研究

Recent results on hadron spectroscopy at LHCb

• Liming Zhang (Tsinghua University)

I will present several new results on observations of excited baryons at LHCb

Decay properties of molecular states

• 殿勇 陈 (东南大学)

Decay properties of molecular states

ssss四夸克态

• Hua-Xing Chen (Beihang University)

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。

Solution to the Y problem

• 俊璋 王 (Lanzhou University)

Solution to the Y problem

1-+奇特态

• 相坤 董 (UCAS)

1-+奇特态

Jetomography of QGP in heavy-ion collisions

• Xin-Nian Wang (Central China Normal University/Lawrence Berkeley National Laboratory)

Jetomography of QGP in heavy-ion collisions

BESIII上的超子极化研究

• Rong-Gang Ping (高能所)

BESIII上的超子极化研究

DDK 3-body system in Lattice QCD

• Jin-Yi Pang (University of Shanghai Science and Techology)

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.

Lattice calculation of hadron structure: parton distribution functions

• Wei Wang (Shanghai JiaoTong University)

In this talk, I will introduce the new method of using Lattice QCD to simulate the Parton distribution functions.

Identifying the $\Sigma_b(6097)$, $\Xi_b(6227)$ and $\Omega_b$ as P-wave bottom baryons

• Er-Liang Cui (Northwest A&F University)

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.

Triangle singularity appearing as an X(3872)-like peak in $B\to(J/\psi \pi+ \pi-)K\pi$

• Satoshi Nakamura (Universidade Cruzeiro do Sul)

Triangle singularity appearing as an X(3872)-like peak in $B\to(J/\psi \pi+ \pi-)K\pi$

闭幕式

• Hai-Ping Peng (USTC)