# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
HADRON 2021 is over. Thanks for making it a success!
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## Place

Location: Mexico City
Date: 28 Jul 09:00 - 10:45

## Conveners

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

## Timetable | Contribution List

Displaying 5 contributions out of 5
Type: Parallel Session: Exotic hadrons and candidates-4
We apply the effective range expansion and generalized Weinberg's compositeness relations to analyze the internal structures of several exotic hadron candidates near underlying two-body thresholds. This formalism enables us to give quantitative estimates of the weights of different constituents inside the exotic hadrons. Useful information, including the partial decay widths, can be predicted, whi ... More
Presented by Prof. Zhi-Hui GUO on 28/7/2021 at 10:25
Type: Parallel Session: Exotic hadrons and candidates-4
We discuss the distinguishing properties of the correlation functions of multiquark currents (tetra, penta, etc) compared to the correlation functions of bilinear and trilinear quark currents. Based on these properties, we demonstrate a proper way to construct QCD sum rules for exotic multiquark states. Based on W.Lucha, D.Melikhov, H.Sazdjian: PRD, 014010 (2019); PRD100, 074029 (2019), ... More
Presented by Prof. Dmitri MELIKHOV on 28/7/2021 at 14:45
Type: Parallel Session: Exotic hadrons and candidates-4
Using 980 fb$^{−1}$ data collected with the Belle detector, the two-photon process $\gamma\gamma\to\gamma\psi(2S)$ is studied for the first time in an effective center-of-mass energy between 3.7 and 4.2 GeV. A clear evidence is observed for a structure in the $\gamma\psi(2S)$ mass distribution at $3921.3\pm2.4\pm1.6$ MeV/$c^{2}$, while hint is found for another structure around 4000 MeV/$c^{2}$. ... More