Search for Lepton and Baryon Number Violating tau^- Decays into \bar{p}gamma, \bar{p}pi^0, \bar{Lambda}pi^-, and Lambda pi^-

Details Search for Lepton and Baryon Number Violating tau^- Decays into \bar{p}gamma, \bar{p}pi^0, \bar{Lambda}pi^-, and Lambda pi^- Search for Lepton and Baryon Number Violating tau^- Decays into \bar{p}gamma, \bar{p}pi^0, \bar{Lambda}pi^-, and Lambda pi^-

2004-08-24

arxiv.org/abs/hep-ex/0408117v1

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 10 figures, submitted to ICHEP2004, Beijing, China

Scientific paper

We have searched for decays that violate both lepton and baryon number using data collected by the Belle detector at the KEKB asymmetric e^+e^- collider. No signals are found in tau^- -> \bar{p} gamma, tau^- -> \bar{p} pi^0, tau^- -> \bar{Lambda} pi^-, and tau^- -> Lambda pi^- and we set upper limits on the branching fractions of B(tau^- -> \bar{p}gamma) < 3.0*10^{-7}, B(tau^- -> \bar{p}pi^0) < 6.5*10^{-7}, B(tau^- -> \bar{Lambda}pi^-) < 1.3*10^{-7}, and B(tau^- -> Lambda pi^-) < 0.70*10^{-7} at the 90% confidence level. The former two results improve the previous limits by a factor of 12 and 23, respectively, while the latter two are the first searches ever performed.

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