Search for the lepton flavor violating decay Z?eµ in pp collisions at vs = 8 TeV with the ATLAS detector

The ATLAS detector at the Large Hadron Collider is used to search for the lepton flavor violating process Z?eµ in pp collisions using 20.3??fb-1 of data collected at vs=8??TeV. An enhancement in the eµ invariant mass spectrum is searched for at the Z-boson mass. The number of Z bosons produced in the data sample is estimated using events of similar topology, Z?ee and µµ, significantly reducing the systematic uncertainty in the measurement. There is no evidence of an enhancement at the Z-boson mass, resulting in an upper limit on the branching fraction, B(Z?eµ)<7.5×10-7 at the 95% confidence level.