PoS - Proceedings of Science
Volume 316 - XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG4-WG5 Joint Session
Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production via two-photon collisions
Q. Xu* and  On behalf of the BELLE Collaboration
Full text: pdf
Pre-published on: September 20, 2018
Published on: November 23, 2018
We report the measurements of $\gamma\gamma\rightarrow\eta_{c}(1S), \eta_{c}(2S)\rightarrow\eta'\pi^{+}\pi^{-}$ with $\eta'$ decays to $\gamma\rho$ and $\eta\pi^{+}\pi^{-}$ using 941 fb$^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. First observation of $\eta_{c}(2S)\rightarrow\eta'\pi^{+}\pi^{-}$ with a significance 5.5$\sigma$ including systematic error is obtained. The products of the two-photon decay width and branching fraction of decays to $\eta'\pi^{+}\pi^{-}$ are determined for the $\eta_{c}(1S)$ and $\eta_{c}(2S)$, respectively. A new decay mode for the $\eta_c(1S)\rightarrow\eta'f_0(2080)$ with $f_0(2080)\rightarrow\pi^+\pi^-$ is observed with a statistical significance of 20$\sigma$. The cross section for $\gamma\gamma\rightarrow\eta'\pi^{+}\pi^{-}$ and $\eta'f_{2}(1270)$) are measured for the first time.
DOI: https://doi.org/10.22323/1.316.0225
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.