The discrete contribution to ${\psi }^{\prime }\to J/\psi +\gamma \gamma$

Zhi-Guo He, Xiao-Rui Lu, Joan Soto +1

The decay mode $\psi (2S)\to J/\psi +\gamma \gamma$ is proposed in order to experimentally identify the effects of the coupling of charmonium states to the continuum $D\bar{D}$ states. To have a bette…