Measurement of the τ lepton mass and an upper limit on the mass difference between τ and τ-

K Belous; M Shapkin; A Sokolov; K Abe; K Abe; I Adachi; H Aihara; D Anipko; K Arinstein; V Aulchenko; T Aushev; AM Bakich; E Barberio; A Bay; I Bedny; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bračko; TE Browder; MC Chang; A Chen; KF Chen; WT Chen; BG Cheon; R Chistov; Y Choi; YK Choi; S Cole; J Dalseno; A Drutskoy; S Eidelman; D Epifanov; S Fratina; M Fujikawa; N Gabyshev; T Gershon; G Gokhroo; B Golob; H Ha; J Haba; Y Hasegawa; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; T Hokuue; Y Hoshi; S Hou; WS Hou; T Iijima; K Ikado; A Imoto; K Inami; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; H Kaji; JH Kang; P Kapusta; N Katayama; T Kawasaki; HR Khan; H Kichimi; YJ Kim; P Križan; P Krokovny; R Kulasiri; R Kumar; CC Kuo; A Kuzmin; YJ Kwon; J Lee; MJ Lee; SE Lee; T Lesiak; SW Lin; D Liventsev; G Majumder; F Mandl; T Matsumoto; A Matyja; S McOnie; H Miyake; H Miyata; Y Miyazaki; R Mizuk; E Nakano; M Nakao; H Nakazawa; Z Natkaniec; S Nishida; O Nitoh; S Ogawa; T Ohshima; S Okuno; SL Olsen

Journal article

Measurement of the τ lepton mass and an upper limit on the mass difference between τ and τ-

K Belous, M Shapkin, A Sokolov, K Abe, K Abe, I Adachi, H Aihara, D Anipko, K Arinstein, V Aulchenko, T Aushev, AM Bakich, E Barberio, A Bay, I Bedny, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek Show all

Physical Review Letters | Published : 2007

DOI: 10.1103/PhysRevLett.99.011801

Abstract

The mass of the τ lepton has been measured in the decay mode τ→3πντ using a pseudomass technique. The result obtained from 414fb-1 of data collected with the Belle detector is Mτ=[1776.61±0. 13(stat)±0.35(sys)]MeV/c2. The upper limit on the relative mass difference between positive and negative τ leptons is |Mτ+-Mτ-|/ Mτ<2.8×10-4 at 90% confidence level. © 2007 The American Physical Society.