An upper limit on the branching ratio for τ decays into seven charged particles K Ackerstaff , G Alexander , J Allison , N Altekamp , K J Anderson , S Anderson , S Arcelli , S Asai , D Axen , G Azuelos , A H Ball , E Barberio , R J Barlow , R Bartoldus , J R Batley , S Baumann , J Bechtluft , C Beeston , T Behnke , A N Bell , K W Bell , G Bella , S Bentvelsen , P Berlich , S Bethke , O Biebel , A Biguzzi , S D Bird , V Blobel , I J Bloodworth , J E Bloomer , M Bobinski , P Bock , D Bonacorsi , M Boutemeur , B T Bouwens , S Braibant , L Brigliadori , R M Brown , H J Burckhart , C Burgard , R Burgin , P Capiluppi , R K Carnegie , A A Carter , J R Carter , C Y Chang , D G Charlton , D Chrisman , P E L Clarke , Ira S Cohen , J E Conboy , O C Cooke , M Cuffiani , S Dado , C Dallapiccola , G M Dallavalle , S De Jong , L A Del Pozo , K Desch , M S Dixit , E Do Couto E Silva , M Doucet , E Duchovni , G Duckeck , I P Duerdoth , Delbert J Eatough , J E G Edwards , P G Estabrooks , H Evans , Michael J B Evans , F Fabbri , Marcello Fanti , A A Faust , F Fiedler , M Fierro , H M Fischer , I Fleck , R Folman , D G Fong , M Foucher , A Furtjes , David Futyan , Pauline Gagnon , J W Gary , J Gascon , S M Gasconshotkin , N I Geddes , Ch Geichgimbel , T Geralis , G Giacomelli , P Giacomelli , R Giacomelli , V Gibson , W R Gibson , D M Gingrich , D Glenzinski , J Goldberg , M J Goodrick , W Gorn , C Grandi , E Gross , J Grunhaus , M Gruwe , C Hajdu , G G Hanson , M Hansroul , M Hapke , C K Hargrove , P A Hart , C Hartmann , M Hauschild , C M Hawkes , Richard John Hawkings , R J Hemingway , M Herndon , G Herten , R D Heuer , M D Hildreth , J C Hill , S J Hillier , T Hilse , P R Hobson , R J Homer , A K Honma , Dezso Horvath , R Howard , D E Hutchcroft , P Igokemenes , D C Imrie , M R Ingram , K Ishii , A Jawahery , P W Jeffreys , H Jeremie , M Jimack , A Joly , C R Jones , G Jones , M G K Jones , U Jost , P Jovanovic , T R Junk , D Karlen , Vakhtang Kartvelishvili , Kyoji Kawagoe , T Kawamoto , R Keeler , R G Kellogg , B W Kennedy , J S Kirk , A Klier , S Kluth , T Kobayashi , M Kobel , D S Koetke , T P Kokott , M Kolrep , S Komamiya , Thomas Kress , P Krieger , J Von Krogh , P Kyberd , G D Lafferty , R Lahmann , W P Lai , D Lanske , J Lauber , S R Lautenschlager , J G Layter , D Lazic , A M Lee , E Lefebvre , D Lellouch , J Letts , L Levinson , S L Lloyd , F K Loebinger , G D Long , M J Losty , J Ludwig , A Macchiolo , A Macpherson , M Mannelli , S Marcellini , C Markus , A Martin , J P Martin , G Martinez , T Mashimo , P Mattig , W J Mcdonald , J A Mckenna , E A Mckigney , T J Mcmahon , R A Mcpherson , F Meijers , S Menke , F S Merritt , H Mes , J Meyer , Aldo Michelini , G Mikenberg , David J Miller , A I Mincer , R Mir , W Mohr , A Montanari , T Mori , M Morii , U Muller , K Nagai , Ichiro Nakamura , H A Neal , B Nellen , R Nisius , S W Oneale , F G Oakham , F Odorici , H Ogren , N J Oldershaw , M J Oreglia , S Orito , J Palinkas , Gabriella Pasztor , J R Pater , G N Patrick , J Patt , M J Pearce , S Petzold , P Pfeifenschneider , J E Pilcher , J L Pinfold , D E Plane , P Poffenberger , B Poli , A Posthaus , H Przysiezniak , D L Rees , D Rigby , S H Robertson , S A Robins , N Rodning , J M Roney , A Rooke , E Ros , A M Rossi , M Rosvick , P Routenburg , Y Rozen , K Runge , O Runolfsson , U Ruppel , D R Rust , R Rylko , K Sachs , T Saeki , E K G Sarkisyan , C Sbarra , A D Schaile , O Schaile , F Scharf , P Scharffhansen , P Schenk , J Schieck , P Schleper , B Schmitt , Sebastian Schmitt , A Schoning , M Schroder , H C Schultzcoulon , Mark R Schulz , Markus Schumacher , C Schwick , W G Scott , T Shears , B C Shen , C H Shepherdthemistocleous , P Sherwood , G P Siroli , A Sittler , A Skillman , A Skuja , A M Smith , G A Snow , R Sobie , S Soldnerrembold , R W Springer , M Sproston , K Stephens , J Steuerer , B Stockhausen , K Stoll , D Strom , P Szymanski , R Tafirout , S D Talbot , S Tanaka , P Taras , S Tarem , R J Teuscher , M Thiergen , Mark Thomson , E Von Torne , S Towers , Isabel Marian Trigger , E Tsur , A S Turcot , M F Turnerwatson , P Utzat , R Van Kooten , M Verzocchi , P Vikas , E H Vokurka , H Voss , F Wackerle , A Wagner , C P Ward , D R Ward , P M Watkins , A T Watson , N K Watson , P S Wells , N Wermes , J S White , B Wilkens , G W Wilson , J A Wilson , G Wolf , T R Wyatt , Sumiyo Yamashita , G Yekutieli , V Zacek , D Zerzion PHYSICS LETTERS B（1997）
摘要
We have searched for decays of the tau lepton into seven or more charged particles, using data collected with the OPAL detector from 1990 to 1995 in e(+)e(-) collisions at root s approximate to M-z. No candidate events were found and an upper limit on the branching ratio for tau decays into seven charged particles of 1.8 x 10(-5) at the 95% confidence level was determined. (C) 1997 Published by Elsevier Science B.V.
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data collection, charged particles, particle physics, confidence level
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