Radiative decays J/ψ → η(′)γ in perturbative QCD

Abstract

With the recent investigations of the g*g*-η(′) transition form factor and η-η′ mixing scheme, we present an updated study of the radiative decays J/ψ → η(′)γ in perturbative QCD. The decays are taken as a test ground for the g*g*-η(′) transition form factors and the η-η′ mixing scheme. The form factors are found to be working for glunic η′ production and the mixing angle is constrained to be φ = 35.1°±0.8°.