Observation of $η_{c} \to p\bar{p}η$ via $ψ(3686) \to γp\bar{p}η$
BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson et autres
The decay $η_c\to p\bar{p}η$ is observed for the first time with a significance of exceeding $10σ$. It is found by analyzing $(2712.4 \pm 14.3)\times10^{6}$ $ψ(3686)$ events accumulated at the BESIII detector. The measured branching fraction of $η_c\to p\bar{p}η$ via $ψ(3686) \to γp …