Observation of η_{c}(2S) \to K^{+}K^{-}η

By analyzing (27.12 \pm 0.14)\times10^{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 significance of 6.2\sigma after considering systematic uncertainties. The product of the branching fractions of \psi(3686) \to \gamma\eta_{c}(2S) and \eta_{c}(2S) \to K^{+} K^{-} \eta... Show more