Observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$

M. Ablikim, M. N. Achasov, S. Ahmed +455

We report the observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$ using $1.3\times 10^9$ $J/\psi$ events collected with the BESIII detector. Its branching fraction, including all…