Radiative charmonium decays in a contact-interaction model with dynamical quark anomalous magnetic moment

Yehan Xu, Zanbin Xing, Khépani Raya +1

The BESIII Collaboration has recently reported two measurements of the two-photon decay width of the $\hat{I}{\cdot }_c$ meson. The 2024 result is significantly larger than most theoretical and…