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Search for the Lepton Flavor Violation Process J/psi to eμ at BESIII
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arxiv 1304.3205 v1 pith:SWHZYVCG submitted 2013-04-11 hep-ex
Search for the Lepton Flavor Violation Process J/psi to eμ at BESIII
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We search for the lepton-flavor-violating decay of the $J/\psi$ into an electron and a muon using $(225.3\pm2.8)\times 10^{6}$ $J/\psi$ 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 $\mathcal{B}(J/\psi \to e\mu)< 1.5 \times 10^{-7}$ (90% C.L.) is obtained.
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