Measurement of the lifetime of the tau lepton

M Acciarri,O Adriani,M Aguilarbenitez, S P Ahlen,B Alpat,J Alcaraz,G Alemanni,J Allaby, A Aloisio,G Alverson, M G Alviggi,G Ambrosi,H Anderhub,V Andreev,T Angelescu,F Anselmo,D Antreasyan, A Arefiev,T Azemoon,T Aziz, P Bagnaia,L Baksay,R C Ball,S Banerjee,K Banicz,R Barillere, L Barone,P Bartalini,A Baschirotto,M Basile,R Battiston, A Bay, F Becattini,U Becker,F Behner,J Berdugo,P Berges,B Bertucci, B L Betev,S Bhattacharya,M Biasini,A Biland,G M Bilei,J J Blaising, S Blyth, G J Bobbink,R Bock,A Bohm,B Borgia,A Boucham,D Bourilkov,M Bourquin, D Boutigny,J G Branson,V Brigljevic, I Brock,A Buffini,A Buijs,J D Burger,W J Burger,J Busenitz,A Buytenhuijs,X D Cai,M Campanelli,M Capell,G Cara Romeo,M Caria,G Carlino,A M Cartacci,J Casaus,G Castellini,F Cavallari,N Cavallo,C Cecchi,M Cerrada,F Cesaroni,M Chamizo,A Chan,Y H Chang,U K Chaturvedi,M Chemarin,A Chen, G M Chen,H S Chen, Min Chen, G Chiefari,C Y Chien,M T Choi, L Cifarelli,F Cindolo,C Civinini,I Clare, R Clare,H O Cohn,G Coignet, A P Colijn,N Colino, S Costantini,F Cotorobai,B De La Cruz,A Csilling, T S Dai,R Dalessandro,R De Asmundis,H De Boeck,A Degre, K Deiters,P Denes,F Denotaristefani,D Dibitonto, M Diemoz,D Van Dierendonck,F Di Lodovico, C Dionisi, M Dittmar,A Dominguez,A Doria,I Dorne,M T Dova,E Drago,D Duchesneau,P Duinker,I Duran, Sushanta Dutta,S Easo,Y V Efremenko,H El Mamouni, A Engler,F J Eppling,F C Erne,J P Ernenwein,P Extermann,M Fabre,R Faccini,S Falciano,A Favara,Jean Fay, O L Fedin,M Felcini,B Fenyi,T Ferguson,D Fernandez,F Ferroni,H Fesefeldt,E Fiandrini,J H Field,F Filthaut,P H Fisher,G Forconi,L Fredj, K Freudenreich,C Furetta,Yu Galaktionov,S N Ganguli, P Garciaabia,S S Gau,S Gentile,J Gerald,N Gheordanescu,S Giagu,S Goldfarb,Joel Goldstein,Z F Gong,A Gougas,G Gratta,M W Gruenewald, V K Gupta, A Gurtu, L J Gutay,K Hangarter,B Hartmann,A Hasan,D Hatzifotiadou, T Hebbeker,A Herve,W C Van Hoek, H Hofer,Hafeez R Hoorani,S R Hou, Guofan Hu,V Innocente,H Janssen,B N Jin,L W Jones,P De Jong,I Josamutuberria,A Kasser,R A Khan,Yu Kamyshkov, P Kapinos,J S Kapustinsky,Y Karyotakis,M Kaur,M N Kienzlefocacci,D Kim,J K Kim, S C Kim,Y G Kim,W W Kinnison,A Kirkby,D Kirkby,J Kirkby,D Kiss,W Kittel,A Klimentov,A C Konig,I Korolko,V Koutsenko,R W Kraemer,W Krenz,H Kuijten,A Kunin,P Ladron De Guevara,G Landi,C Lapoint, K Lassilaperini,P Laurikainen,M Lebeau,A A Lebedev, P Lebrun,P Lecomte, P Lecoq,P Le Coultre, J S Lee,Keun Young Lee,Charles Leggett,J M Le Goff,R Leiste,E Leonardi,P Levtchenko, C Li,E Lieb,W T Lin, F L Linde,L Lista, Z A Liu,W Lohmann,E Longo,Wei Lu,Y S Lu,K Lubelsmeyer, C Luci,D Luckey, L Luminari, W Lustermann, W G Ma, M Maity, G Majumder, L Malgeri,A Malinin,C Mana,S Mangla,P Marchesini,Alexandru Marin,J P Martin, F Marzano,G G G Massaro,D Mcnally,S Mele,L Merola, M Meschini,W J Metzger,M Von Der Mey,Y Mi,A Mihul, A J W Van Mil, G Mirabelli,J Mnich,P Molnar,B Monteleoni,R Moore,S Morganti, T Moulik,R Mount,S Muller, F Muheim,E Nagy, S Nahn,M Napolitano, F Nessitedaldi, H B Newman,A Nippe,H Nowak,G Organtini,R Ostonen,D Pandoulas,S Paoletti,P Paolucci,H K Park,G Pascale,G Passaleva, S Patricelli,T Paul,M Pauluzzi, C Paus, F Pauss,D Peach,Y J Pei, S Pensotti,D Perretgallix,S Petrak, A Pevsner, D Piccolo, M Pieri,J C Pinto,P A Piroue,E Pistolesi,V Plyaskin, M Pohl,V Pojidaev,H Postema,N Produit,D Prokofiev,G Rahalcallot,P G Rancoita,M Rattaggi,G Raven,P A Razis,K F Read,D Ren, M Rescigno, S Reucroft,T Van Rhee,S Riemann,B C Riemers,K Riles,O Rind, Sangryul Ro,A Robohm,J Rodin,F J Rodriguez,B P Roe,S Rohner,L Romero,S Rosierlees,Ph Rosselet,W Van Rossum,S Roth,J A Rubio,H Rykaczewski,J Salicio,E Sanchez,A Santocchia,M E Sarakinos,S Sarkar,M Sassowsky, G Sauvage,C Schafer,V A Schegelsky,S Schmidtkaerst,D Schmitz,P Schmitz,M Schneegans,B Schoeneich,N Scholz, H Schopper,D J Schotanus,J Schwenke, G Schwering,C Sciacca,D Sciarrino,J C Sens,L Servoli,S Shevchenko,N Shivarov,V Shoutko,J Shukla,E Shumilov,A Shvorob, T Siedenburg,D Son, A Sopczak,V Soulimov,B Smith,P Spillantini,M Steuer, D P Stickland,H Stone,B Stoyanov,A Straessner,K Strauch, K Sudhakar, G Sultanov,L Z Sun,G Susinno,H Suter,J D Swain,X W Tang, L Tauscher,L Taylor,Samuel C C Ting,F Tonisch,M Tonutti, S C Tonwar, J Toth,C Tully,H Tuchscherer,K L Tung,Y Uchida,J Ulbricht,U Uwer,E Valente,R T Van De Walle, G Vesztergombi,I Vetlitsky,G Viertel,M Vivargent,R Volkert,H Vogel,H Vogt,I Vorobiev,A A Vorobyov,A Vorvolakos,M Wadhwa,W Wallraff,J C Wang, X L Wang,Z M Wang,A Weber,F Wittgenstein,S X Wu,S Wynhoff,Jie Xu,Z Z Xu,B Z Yang,C G Yang,X Y Yao,J B Ye,S C Yeh,J M You,An Zalite,Yu Zalite, P Zemp, Y Zeng,Z P Zhang,Bin Zhou,Yifeng Zhou,G Y Zhu,R Y Zhu, A Zichichi

PHYSICS LETTERS B（2000）

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摘要

The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at center-of-mass energies around the Z pole resulting in tau(tau) = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of Mix per mille. Assuming lepton universality, the value of the strong coupling constant, alpha(s), is found to be alpha(s)(m(r)(2)) = 0.319 +/- 0.015 (exp) +/- 0.014 (theory). (C) 2000 Elsevier Science B.V. All rights reserved.

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