Search for lepton and baryon number violating τ - decays into Λ?π - and Λπ -
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Volume
96
Journal Issue
25
Pages
51-57
Date Issued
2006
Author(s)
Abstract
We have searched for τ lepton decays, τ-→Λ̄π- and τ-→Λπ-, that simultaneously violate the conservation of the lepton (L) and baryon (B) 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(τ-→Λ̄π-) <1.4×10-7 and B(τ-→Λπ-)<0.72×10-7 at the 90% confidence level. This is the first search ever performed for these modes. © 2005 Elsevier B.V. All rights reserved.
Type
journal article