Study of the radiative decay $J/\psi \to {\eta }_c+\gamma$ in light cone sum rules

Abstract

At present, there are many experimental and theoretical results for $J/\psi \to {\eta }_c+\gamma$ 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 $J/\psi \to {\eta }_c+\gamma$. We give the transition form factor of this process based on the leading twist distribution amplitude of ${\eta }_c$ 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.

Comments: 7 pages,3 figures