Does $\psi (4660)$ exist?

Xian-Chen Wang, Quanxing Ye, Qian Wang +1

The nature of the vector charmoniumlike states $\psi (4360)$ and $\psi (4660)$ is controversial, and the existence of the $\psi (4660)$ has been questioned: the BESIII measurement of $e^+e^-\t…