Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920231674-73481869-1927https://doi.org10.1007/s11433-022-1995-0https://hdl.handle.net/20.500.12713/4754We present a search for the lepton flavor violating decay J/psi -> e(+/-)mu(-/+) using 8.998 x 10(9)J/psi events collected with the BESIII detector at the BEPCII e(+)e(-) storage ring. No excess of signal above background is observed; we therefore set an upper limit on the branching fraction of B(J/psi -> e(+/-)mu(-/+)) < 4.5 x 10(-9) at the 90% confidence level. Improving the previous best result by a factor of more than 30, this measurement places the most stringent limit to date on lepton flavor violation in the heavy quarkonium sector.eninfo:eu-repo/semantics/openAccessBesiiiE(+)E(-) ExperimentsCharmoniumLepton Flavor Violating DecayArticle662WOS:0009281659000012-s2.0-85143397666N/A10.1007/s11433-022-1995-0Q1