We present a search for the lepton flavor violating decay B+→K+τμ± using 383×106 BB̄ 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)<7.7×10-5 at 90% confidence level, where the branching fraction is for the sum of the K+τ-μ+ 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. © 2007 The American Physical Society.

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Search for the decay B+→K+τμ±. PHYSICAL REVIEW LETTERS, 99(20), 1-7 [10.1103/PhysRevLett.99.201801].

Search for the decay B+→K+τμ±

PATRIGNANI, CLAUDIA;
2007

Abstract

We present a search for the lepton flavor violating decay B+→K+τμ± using 383×106 BB̄ 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)<7.7×10-5 at 90% confidence level, where the branching fraction is for the sum of the K+τ-μ+ 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. © 2007 The American Physical Society.
2007
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Search for the decay B+→K+τμ±. PHYSICAL REVIEW LETTERS, 99(20), 1-7 [10.1103/PhysRevLett.99.201801].
Aubert, B; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Garra Tico, J.; Grauges, E.; Lope...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/550671
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