A Lattice Study of the Two-photon Decay Widths for Scalar and Pseudo-scalar Charmonium

Ying Chen, Ming Gong, Ning Li +7

In this exploratory study, two photon decay widths of pseudo-scalar (${\eta }_c$) and scalar (${\chi }_{c0}$) charmonium are computed using two ensembles of $N_f=2$ twisted mass lattice QCD ga…