Search for the decay $B^+ \to K^+ \tau\mp \mu\pm$

Abstract : We present a search for the lepton flavor violating decay B+ --> K+ tau-/+ mu+/- using 383 million B Bbar 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+, mu, 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+ tau mu) < 7.7 x 10^-5 at 90% confidence level, where the branching fraction is for the sum of the K+ tau- mu+ and K+ tau+ mu- final states.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00166926
Contributor : Dominique Girod <>
Submitted on : Monday, August 13, 2007 - 10:23:48 AM
Last modification on : Friday, November 20, 2020 - 5:38:01 PM

Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Search for the decay $B^+ \to K^+ \tau\mp \mu\pm$. Physical Review Letters, American Physical Society, 2007, 99, pp.201801. ⟨10.1103/PhysRevLett.99.201801⟩. ⟨in2p3-00166926⟩

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