Observation of the $Y(4230)$ and a new structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$

BESIII Collaboration, M. Ablikim, M. N. Achasov +560

The cross sections of $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ at center-of-mass energies from 4.127 to 4.600~GeV are measured based on 15.6 fb${}^{-1}$ data collected with the BESIII detector…