Observation of ${\eta }^{\prime }\to \omega e^{+}{e}^{-}$

M. Ablikim, M. N. Achasov, X. C. Ai +402

Based on a sample of \etapr mesons produced in the radiative decay $J/\psi \to \gamma {\eta }^{\prime }$ in $1.31\times 10^9$ $J/\psi$ events collected with the BESIII detector, the decay $η^{\prime}\t…