Study of the radiative decay J/ ψ?→? η c ?+? γ in light cone sum rules

摘要

At present, there are many experimental and theoretical results forJ/ψ→ηc+γprocess, 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 decayJ/ψ→ηc+γ. We give the transition form factor of this process based on the leading twist distribution amplitude ofηcmeson, 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.