Observation of a state $X(2600)$ in the ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$ system in the process $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\eta }^{\prime }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +556

Based on $(10087\pm 44)\times 10^6$ $J/\psi$ events collected with the BESIII detector, the process $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\eta }^{\prime }$ is studied using two dominant decay channels of the $…