Search for Charged Lepton Flavor Violation in Narrow Gamma Decays

Charged- leptonflavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarksor compositeness. We present a search for such processes in a sample of 99×10^6Υ(2S) decays and 117×10^6Υ(3S) decays collected with the BABAR detector. We place upper limits on the branching fractionsB(Υ(nS)→e^±τ^∓) and B(Υ(nS)→μ^±τ^∓) (n=2,3) at the 10^(-6) level and use these results to place lower limits of order 1 TeV on the mass scale of charged- leptonflavor-violating effective operators