Revisiting the OZI-forbidden radiative decays of orthoquarkonia

It is interesting to investigate the OZI-forbidden radiative decays of orthoquarkonium, J/ψ→γπ0, γη and γη′ in perturbative QCD. In this work without the approximations adopted in literature we carry out a full one-loop calculation which involves integrations of 4- and 5-point loop functions. Our numerical results are in agreement with the present data. We also briefly discuss the decays of J/ψ→γ+ρ0, as well as ϒ→π0γ, ηγ,η′γ.