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Search for Charged B Meson Decays to a Charged Kaon or Pion, a Tau, and an Electron or Muon Using the BaBar Detector

Abstract

We present a search for the lepton-flavor-violating decays B± &rarr h± &tau l (h= K,π l= e,&mu) using the full BaBar dataset, which corresponds to 471.9 million BBbar pairs. The search uses a sample of events where one B meson (the "tag" B) is fully reconstructed in one of several hadronic final states. Using the tag-B momentum and the reconstructed h and l, we are able to fully reconstruct the &tau 4-momentum. The reconstructed &tau mass is our main discriminant against combinatoric background. The measured upper limits on the branching fractions at the 90% confidence level are on the order of 10-5.

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