Speaker
Description
We report studies of hadrons performed using two-photon processes at Belle. In particular, 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 GeV. Evidence is established for a structure in the $\gamma\psi(2S)$ invariant-mass distribution around 3920 MeV/$c^{2}$, and hint is found for another structure around 4010 MeV/$c^{2}$. With the $\gamma\gamma \to J/\psi \gamma$ process, the two-photon decay width of $\chi_{c2}(1P)$ is reported. We also report the study of $X(3872)$ and $X(3915)$ states using the two-photon process. The results are based on the full data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider.
| Category | talk |
|---|
