Search for Lepton and Baryon Number Violating tau- Decays into Lambda-bar pi- and Lambda pi-

Abstract

We have searched for tau lepton decays, tau- -> Lambda-bar pi- and tau- -> Lambda pi-, that simultaneously violate the conservation of the lepton and baryon number using a data sample of 154 fb^{-1} collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: B(tau^- -> Lambda-barπ-) < 1.4 * 10^{-7} and B(tau^- -> Lambda pi^-) < 0.72 * 10^{-7} at the 90% confidence level. This is the first search ever performed for these modes.

11 pages, 12 figures

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• An Upper Bound on the Decay tau -> mu gamma from Belle
• Search for the Lepton-Flavor-Violating Decay ${\tau }^{-}\to {\mu }^{-}\eta$ at Belle

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• Snowmass 2021 White Paper: Charged lepton flavor violation in the tau sector
• $B^0-{\bar{B}}^0$ mixing in supersymmetry with gauged baryon and lepton numbers
• Instanton-mediated baryon number violation in non-universal gauge extended models
• Search for TeV Scale Physics in Heavy Flavour Decays
• Search for the baryon number and lepton number violating decays ${\tau }^{-}\to \Lambda {\pi }^{-}$ and ${\tau }^{-}\to \bar{\Lambda }{\pi }^{-}$ at Belle II