Search for the Decay B+K+τμ±

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 99, 201801 – Published 15 November 2007

Abstract

We present a search for the lepton flavor violating decay B+K+τμ± using 383×106 BB¯ events collected by the BABAR experiment. The branching fraction for this decay can be substantially enhanced in new physics models. The kinematics of the tau from the signal B decay are inferred from the K+, μ, and other B in the event, which is fully reconstructed in one of a variety of hadronic decay modes, allowing the signal B candidate to be fully reconstructed. We observe no excess of events over the expected background and set a limit of B(B+K+τμ)<7.7×105 at 90% confidence level, where the branching fraction is for the sum of the K+τμ+ and K+τ+μ final states. We use this result to improve a model-independent bound on the energy scale of flavor-changing new physics.

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  • Received 9 August 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.201801

©2007 American Physical Society

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Vol. 99, Iss. 20 — 16 November 2007

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