Search for the charged lepton flavor violating decay $\eta \to e^{\pm }{\mu }^{\mp }$

M. Ablikim, M. N. Achasov, P. Adlarson +708

Based on $(10.087\pm 0.044)\times 10^{9}J/\psi$ events collected at the center-of-mass energy $\sqrt{s}=3.097$~GeV with the BESIII detector, we search for the charged lepton flav…