Observation of $e^{+}{e}^{-}\to \eta \psi (2S)$ at center-of-mass energies from 4.236 to 4.600 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +505

Using a total of $5.25{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process $e^{+}e^{-…