Study of the radiative decay \(J/ \psi \rightarrow \eta_c + \gamma\) in light cone sum rules. (English) Zbl 1473.81186
Summary: 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.
MSC:
| 81U90 | Particle decays |
| 81V80 | Quantum optics |
| 81R25 | Spinor and twistor methods applied to problems in quantum theory |
| 81V35 | Nuclear physics |
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