We search for the lepton-flavor-violating decay of the $J/psi$ into an
electron and a muon using $(225.3pm2.8) imes 10^{6}$ $J/psi$ events
collected with the BESIII detector at the BEPCII collider. Four candidate
events are found in the signal region, consistent with background expectations.
An upper limit on the branching fraction of $mathcal{B}(J/psi o emu)< 1.5
imes 10^{-7}$ (90% C.L.) is obtained.
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