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arxiv 1001.1883 v1 pith:MG6BII77 submitted 2010-01-12 hep-ex

Search for Charged Lepton Flavor Violation in Narrow Upsilon Decays

The BABAR Collaboration: B. Aubert , et al This is my paper
classification hep-ex
keywords chargeddecaysflavorleptonlimitsmodelplaceprocesses
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Charged lepton flavor 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 leptoquarks or compositeness. We present a search for such processes in a sample of 99M Y(2S) decays and 117M Y(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions BF(Y(nS) -> e tau) and BF(Y(nS) -> mu tau) (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 lepton flavor violating effective operators.

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