Investigating ${\eta }_1^{\prime }(1855)$ exotic states in $J/\psi \to {\eta }_1^{\prime }(1855){\eta }^{(\prime )}$ decays

Yao Yu, Xiong Zhuang, Han Zhang +3

An analysis of the $J/\psi \to \eta {\eta }^{\prime }\gamma$ decay by the BESIII collaboration claims the observation of an exotic state ${\eta }_1(1855)$ with $I^G{J}^{PC}=0^{+}{1}^{-+}$. To establish its C-parity…