Search for lepton and baryon number violating τ- decays into Λ̄π- and Λπ-

Y Miyazaki; K Abe; K Abe; I Adachi; H Aihara; K Arinstein; Y Asano; V Aulchenko; T Aushev; S Bahinipati; AM Bakich; V Balagura; E Barberio; I Bedny; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bračko; J Brodzicka; TE Browder; P Chang; Y Chao; A Chen; KF Chen; WT Chen; BG Cheon; R Chistov; Y Choi; A Chuvikov; S Cole; J Dalseno; M Danilov; M Dash; LY Dong; A Drutskoy; S Eidelman; Y Enari; D Epifanov; S Fratina; N Gabyshev; A Garmash; T Gershon; A Go; G Gokhroo; B Golob; A Gorišek; HC Ha; K Hayasaka; H Hayashii; M Hazumi; T Hokuue; Y Hoshi; S Hou; WS Hou; T Iijima; K Ikado; A Imoto; K Inami; A Ishikawa; R Itoh; Y Iwasaki; JH Kang; JS Kang; P Kapusta; N Katayama; H Kawai; T Kawasaki; HR Khan; H Kichimi; HJ Kim; JH Kim; SK Kim; SM Kim; S Korpar; P Križan; P Krokovny; R Kulasiri; CC Kuo; A Kuzmin; YJ Kwon; G Leder; SE Lee; T Lesiak; SW Lin; D Liventsev; G Majumder; F Mandl; T Matsumoto; A Matyja; Y Mikami; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; GR Moloney; T Nagamine; Y Nagasaka; E Nakano

Journal article

Search for lepton and baryon number violating τ- decays into Λ̄π- and Λπ-

Y Miyazaki, K Abe, K Abe, I Adachi, H Aihara, K Arinstein, Y Asano, V Aulchenko, T Aushev, S Bahinipati, AM Bakich, V Balagura, E Barberio, I Bedny, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bračko Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | ELSEVIER SCIENCE BV | Published : 2006

DOI: 10.1016/j.physletb.2005.10.024

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.