We present a search for the lepton flavor violating decay B+-> K+tau(-/+)mu(+/-) using 383x10(6) B (B) over bar 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)< 7.7x10(-5) at 90% confidence level, where the branching fraction is for the sum of the K+tau(-)mu(+) and K+tau(+)mu(-) final states. We use this result to improve a model-independent bound on the energy scale of flavor-changing new physics.

Search for the decay B+-> K+tau(-/+)mu(+/-)

Baracchini E;Ferroni F;
2007-01-01

Abstract

We present a search for the lepton flavor violating decay B+-> K+tau(-/+)mu(+/-) using 383x10(6) B (B) over bar 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)< 7.7x10(-5) at 90% confidence level, where the branching fraction is for the sum of the K+tau(-)mu(+) and K+tau(+)mu(-) final states. We use this result to improve a model-independent bound on the energy scale of flavor-changing new physics.
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/20.500.12571/1485
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 15
social impact