Does $\psi (4660)$ exist?

Xian-Chen Wang, Quanxing Ye, Qian wang

We investigate $S$-wave coupled-channel effects in $e^{+}{e}^{-}$ annihilation in the energy region $\sqrt{s}\in [4.0,5.5]\mathrm{GeV}$, including the open-charm final states $Λ_c^+\bar…