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We report on the first search for electron-muon lepton flavor violation (LFV)in the decay of a $b$~quark and $b$~antiquark bound state. We look for the LFVdecay $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$ in a sample of 118~million$\Upsilon (3S)$ mesons from 27~fb$^{-1}$ of data collected with the \babar\detector at the SLAC PEP-II $e^+e^-$ collider operating with a 10.36~GeVcenter-of-mass energy. No evidence for a signal is found and we set a limit onthe branching fraction $\mathcal{B}(\Upsilon(3S)\rightarrowe^{\pm}\mu^{\mp})<3.6\times10^{-7}\mathrm{at~ 90\%~ CL}$. This result can beinterpreted as a limit $\Lambda_{NP}/g^2_{NP} > 80~$TeV on the energy scale$\Lambda_{NP}$ divided by the coupling-squared $g^2_{NP}$ of relevant newphysics.

Search for Lepton Flavor Violation in $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$