Search for $C=+$ charmonium states in $e^{+}{e}^{-}\to \gamma +X$ at BEPCII/BESIII

Kuang-Ta Chao, Zhi-Guo He, Dan Li +1

We extend our original study in Ref. [1] on the production of $C=+$ charmonium states $X={\eta }_c(1S/2S)$ and ${\chi }_{cJ}(1P/2P)$ in $e^{+}{e}^{-}\to \gamma +X$ at B factories to the BEPCII/BESIII ene…