# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## $\gamma\gamma \to \gamma\psi(2S)$ and other studies on charmonium at Belle

Not scheduled
20m
Zoom

#### Zoom

Poster QCD and Hadronic Physics

### Speaker

Baoshen Gao (Fudan)

### Description

Using $980 {\mathrm fb}^{−1}$ of 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 ranging from $3.7$ to $4.2\,{\rm GeV}$. Evidence is established for a structure in the $\gamma\psi(2S)$ invariant-mass distribution at $3921.3 \pm 2.4 \pm 1.6\,{\rm MeV}$, and hint is found for another structure around $4000\,{\rm MeV}$. We also report other studies related to charmoniuum or charmoniuum-like states at Belle.

Email shohei.nishida@kek.jp Belle S. Nishida

### Primary author

Shohei Nishida (BELLE (BELLE II Experiment))