Contact-interaction model with dynamical quark anomalous magnetic moment reproduces lattice QCD results for eta_c to gamma gamma and J/psi to gamma eta_c decays, consistent with 2026 data but not the 2024 measurement.
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Mixing with a small angle between the pseudoscalar glueball and η_c can increase Br(J/ψ → γ X(2370)) well above the pure-glueball value of 2.3(8)×10^{-4}.
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Radiative charmonium decays in a contact-interaction model with dynamical quark anomalous magnetic moment
Contact-interaction model with dynamical quark anomalous magnetic moment reproduces lattice QCD results for eta_c to gamma gamma and J/psi to gamma eta_c decays, consistent with 2026 data but not the 2024 measurement.
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Production Rate of Glueball-like $X(2370)$ in $J/\psi$ Radiative Decay
Mixing with a small angle between the pseudoscalar glueball and η_c can increase Br(J/ψ → γ X(2370)) well above the pure-glueball value of 2.3(8)×10^{-4}.