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Revisiting the OZI-forbidden Radiative Decays of Orthoquarkonia
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Revisiting the OZI-forbidden Radiative Decays of Orthoquarkonia
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It is interesting to investigate the OZI-forbidden radiative orthoquarkonium decays $J/\psi\to \gamma\pi^0, \gamma\eta$ and $\gamma\eta'$ 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-point and 5-point loop functions. Our numerical results are in agreement with the present data. We also briefly discuss the decays of $J/\psi\to \gamma+\rho^0$, as well as $\Upsilon\to \pi^0\gamma, \eta\gamma, \eta'\gamma$.
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Radiative decays $J/\psi,\,\psi(2S)\rightarrow\gamma\eta^{(\prime)}$ in perturbative QCD with relativistic corrections
Order-q² relativistic corrections in pQCD roughly double J/ψ→γη(') rates and favor a smaller mixing angle, while ψ(2S) rates overshoot data and may require coherent ηc mixing.
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