Revisiting the radiative decays $J/\psi \to \gamma {\eta }^{(\prime )}$ in perturbative QCD

Jun-Kang He, Ya-Dong Yang

In the framework of perturbative QCD, the radiative decays $J/\psi \to \gamma {\eta }^{(\prime )}$ are revisited in detail, where the involved one-loop integrals are evaluated analytically w…