Search for the rare decay ${\eta }^{\prime }\to 3\gamma$

M. Ablikim, M. N. Achasov, P. Adlarson +779

Using a data sample of $(10087\pm 44)\times 10^{6}J/\psi$ events collected with the BESIII detector, we search for the rare decay ${\eta }^{\prime }\to 3\gamma$ via the process $J/ψ\toγη^{\pri…