An upper limit on the branching ratio for τ decays into seven charged particles

K Ackerstaff; G Alexander; J Allison; N Altekamp; KJ Anderson; S Anderson; S Arcelli; S Asai; D Axen; G Azuelos; AH Ball; E Barberio; RJ Barlow; R Bartoldus; JR Batley; S Baumann; J Bechtluft; C Beeston; T Behnke; AN Bell; KW Bell; G Bella; S Bentvelsen; P Berlich; S Bethke; O Biebel; A Biguzzi; SD Bird; V Blobel; IJ Bloodworth; JE Bloomer; M Bobinski; P Bock; D Bonacorsi; M Boutemeur; BT Bouwens; S Braibant; L Brigliadori; RM Brown; HJ Burckhart; C Burgard; R Bürgin; P Capiluppi; RK Carnegie; AA Carter; JR Carter; CY Chang; DG Charlton; D Chrisman; PEL Clarke; I Cohen; JE Conboy; OC Cooke; M Cuffiani; S Dado; C Dallapiccola; GM Dallavalle; S de Jong; LA del Pozo; K Desch; MS Dixit; E do Couto e Silva; M Doucet; E Duchovni; G Duckeck; IP Duerdoth; D Eatough; JEG Edwards; PG Estabrooks; HG Evans; M Evans; F Fabbri; M Fanti; AA Faust; F Fiedler; M Fierro; HM Fischer; I Fleck; R Folman; DG Fong; M Foucher; A Fürtjes; DI Futyan; P Gagnon; JW Gary; J Gascon; SM Gascon-Shotkin; NI Geddes; C Geich-Gimbel; T Geralis; G Giacomelli; P Giacomelli; R Giacomelli; V Gibson; WR Gibson; DM Gingrich; D Glenzinski; J Goldberg; MJ Goodrick; W Gorn

Journal article

An upper limit on the branching ratio for τ decays into seven charged particles

K Ackerstaff, G Alexander, J Allison, N Altekamp, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, S Baumann, J Bechtluft, C Beeston, T Behnke, AN Bell Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | ELSEVIER SCIENCE BV | Published : 1997

DOI: 10.1016/S0370-2693(97)00648-5

Abstract

We have searched for decays of the τ lepton into seven or more charged particles, using data collected with the OPAL detector from 1990 to 1995 in e+e- collisions at √s ≈ Mz. No candidate events were found and an upper limit on the branching ratio for T decays into seven charged particles of 1.8 × 10-5 at the 95% confidence level was determined. © 1997 Published by Elsevier Science B.V.