Observation of $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ and improved measurement of $J/\psi \to p\bar{p}{\eta }^{\prime }$

M. Ablikim, M. N. Achasov, S. Ahmed +460

We observe the process $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ for the first time, with a statistical significance higher than 10$\sigma$, and measure the branching fraction of $J/ψ\to p \ba…