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Radiative decays of $J/ψ,\,ψ(2S)\rightarrowγη^{(\prime)}$ in perturbative QCD with relativistic corrections
We present the first calculation of the radiative decays $J/ψ,ψ(2S)\rightarrowγη^{(\prime)}$ in perturbative QCD that includes the order-$q^{2}$ relativistic corrections in all three short-distance contributions, namely the quark-antiquark, two-gluon, and QED contributions. The amplitudes are found
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