Search for Lepton and Baryon Number Violating tau^- Decays into pgamma, ppi⁰, Lambdapi^-, and Lambda pi^-

2004/08/24 by K. Abe, Abe, K.
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Computational Physics and Python Applications #Particle Detector Development and Performance

paper · pdf · doi:10.48550/arxiv.hep-ex/0408117

Abstract

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^- -> p gamma, tau^- -> p pi⁰, tau^- -> Lambda pi^-, and tau^- -> Lambda pi^- and we set upper limits on the branching fractions of B(tau^- -> pgamma) < 3.0*10^-7, B(tau^- -> ppi⁰) < 6.5*10^-7, B(tau^- -> Lambdapi^-) < 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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