Study of the radiative decay \(J/ \psi \rightarrow \eta_c + \gamma\) in light cone sum rules

DOI10.1016/J.NUCLPHYSB.2020.115053zbMath1473.81186arXiv1912.00836OpenAlexW2990686704MaRDI QIDQ2230252

Yan-Jun Sun, Song-Pei Guo, Qi Huang, Guo-Hua Zhao, Hong, Wei

Publication date: 17 September 2021

Published in: Unnamed Author (Search for Journal in Brave)

Abstract: At present, there are many experimental and theoretical results for

J / p s i i g h t a r r o w e t a_{c} + g a m m a

process, while the results are inconsistent based on different methods and considerations. In this paper, the light cone sum rules method is used in studying the radiative decay

J / p s i i g h t a r r o w e t a_{c} + g a m m a

. We give the transition form factor of this process based on the leading twist distribution amplitude of

e t a_{c}

meson, with this form factor further obtain the decay width. Our result is consistent with those of other sum rules. A comparison of our result with others' about the decay width is also presented.

Full work available at URL: https://arxiv.org/abs/1912.00836

Mathematics Subject Classification ID

Nuclear physics (81V35) Quantum optics (81V80) Spinor and twistor methods applied to problems in quantum theory (81R25) Particle decays (81U90)