26-31 July 2021
Mexico City
Mexico/General timezone
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Contribution Leading parallel

Mexico City -
Exotic Hadrons and Candidates

Study of charmonium-like states in two-photon collisions at Belle


  • Yoshiki TERAMOTO

Primary authors


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/$c^{2}$. In addition, we report several other studies related to charmonium and charmonium-like states.