Study of the Dalitz decay $J/\psi \to e^{+}{e}^{-}\eta$

BESIII Collaboration, M. Ablikim, M. N. Achasov +507

We report corrected results on a study of the electromagnetic Dalitz decay $J/\psi \to e^{+}{e}^{-}\eta$ and search for di-electron decays of a light dark gauge boson (${\gamma }^{\prime }$) in $J/\psi \to {\gamma }^{\prime }\eta$ w…