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.

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) [10.1103/PhysRevLett.99.201801].

Search for the decay B+→K+τμ±

CARPINELLI, Massimo;
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.
Articolo in rivista - Articolo scientifico
High energy physics; Kinematics; Signal processing; Branching fraction; Hadronic decay modes; Lepton flavor violating decay; Physics models; Particle detectors;
English
2007
99
20
201801
none
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) [10.1103/PhysRevLett.99.201801].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389646
Citazioni
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 15
Social impact