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.
| First author | S. Nishida |
|---|---|
| shohei.nishida@kek.jp | |
| Collaboration / Activity | Belle |
Primary author
Shohei Nishida
(BELLE (BELLE II Experiment))
