A new look at $\psi (4160)$ and $\psi (4230)$

Zhi-Yong Zhou, Chun-Yong Li, Zhiguang Xiao

By simultaneously analyzing the cross section data of $e^{+}{e}^{-}\to D\bar{D},D{\bar{D}}^{\ast },D^{\ast }{\bar{D}}^{\ast },D\bar{D}\pi$ in a coupled-channel scheme with unitarity, we found that, in co…