Observation of ${\eta }_c(2S)\to K^{+}{K}^{-}\eta$

BESIII Collaboration, M. Ablikim, M. N. Achasov +645

By analyzing $(27.12\pm 0.14)\times 10^8$ $\psi (3686)$ events accumulated with the BESIII detector, the decay ${\eta }_c(2S)\to K^{+}{K}^{-}\eta$ is observed for the first time with a sig…