How higher charmonia shape the puzzling data of the $e^{+}{e}^{-}\to \eta J/\psi$ cross section

Tian-Cai Peng, Zi-Yue Bai, Jun-Zhang Wang +1

Recently, the BESIII collaboration performed a precise measurement of the $e^{+}{e}^{-}\to \eta J/\psi$ cross section. It is puzzling that the resonance parameters of the reported $Y(4230)$ sho…