Observation of ${\eta }_c\to p\bar{p}\eta$ via $\psi (3686)\to \gamma p\bar{p}\eta$

BESIII Collaboration, M. Ablikim, M. N. Achasov +766

The decay ${\eta }_c\to p\bar{p}\eta$ is observed for the first time with a significance of exceeding $10\sigma$. It is found by analyzing $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events accumu…