Measurement of the $\tau$ branching fractions into leptons

M Acciarri,P Achard,O Adriani, M Aguilarbenitez,J Alcaraz,G Alemanni,J Allaby, A Aloisio,M G Alviggi,G Ambrosi,H Anderhub,V Andreev,T Angelescu,F Anselmo, A Arefiev,T Azemoon,T Aziz, P Bagnaia,A Bajo,L Baksay,A Balandras,S V Baldew,Sw Banerjee,A Barczyk,R Barillere,P Bartalini,M Basile,N Batalova,R Battiston, A Bay, F Becattini,U Becker,F Behner,L Bellucci,R Berbeco,J Berdugo,P Berges,B Bertucci,B L Betev,S Bhattacharya, M Biasini,A Biland,J J Blaising, S Blyth, G J Bobbink,A Bohm, L Boldizsar,B Borgia,D Bourilkov,M Bourquin,S Braccini, J G Branson, F M Brochu,A Buffini,A Buijs,J D Burger,W J Burger,X D Cai,M Capell,G Cara Romeo,G Carlino,A M Cartacci,J Casaus,G Castellini,F Cavallari, N Cavallo,C Cecchi, M Cerrada,F Cesaroni,M Chamizo,Y H Chang,U K Chaturvedi,M Chemarin,A Chen,G M Chen,H F Chen, G Chiefari, L Cifarelli, F Cindolo, C Civinini,I Clare, R Clare,G Coignet, A P Colijn, N Colino, S Costantini,F Cotorobai,B De La Cruz,A Csilling,S Cucciarelli,T S Dai,J A Van Dalen, R Dalessandro,R De Asmundis,P Deglon,A Degre, K Deiters,D Della Volpe,E Delmeire,P Denes,F Denotaristefani,A De Salvo, M Diemoz,M Dierckxsens,D Van Dierendonck, C Dionisi, M Dittmar, A Dominguez,A Doria,M T Dova,D Duchesneau,D Dufournaud,P Duinker,H El Mamouni, A Engler, F J Eppling,F C Erne,A Ewers,P Extermann, M Fabre,M A Falagan,S Falciano,A Favara, J Fay, O L Fedin, M Felcini,T Ferguson,H Fesefeldt,E Fiandrini,J H Field, F Filthaut,P H Fisher,I Fisk,G Forconi, K Freudenreich,C Furetta,Yu Galaktionov,S N Ganguli, P Garciaabia, M Gataullin,S S Gau,S Gentile,N Gheordanescu, S Giagu,Z F Gong,G Grenier,O Grimm,M W Gruenewald,M Guida,R Van Gulik, V K Gupta, A Gurtu, L J Gutay,D Haas,A Hasan,D Hatzifotiadou, T Hebbeker,A Herve, P Hidas,J Hirschfelder, H Hofer,G Holzner,Hafeez R Hoorani, S R Hou,Y Hu, I Iashvili,B N Jin,L W Jones,P De Jong,I Josamutuberria, R A Khan,D Kafer,M Kaur,M N Kienzlefocacci,D Kim,Jong Kyu Kim,J Kirkby,D Kiss,W Kittel,A Klimentov,A C Konig,M Kopal,Anna Katharina Kopp,V Koutsenko,M Kraber,R W Kraemer,W Krenz, A Kruger,A Kunin,P Lacentre,P Ladron De Guevara,I Laktineh,G Landi,M Lebeau, A Lebedev, P Lebrun,P Lecomte, P Lecoq,P Le Coultre,H J Lee,J M Le Goff,R Leiste,P Levtchenko,Chunhua Li,S Likhoded,C H Lin,W T Lin,F L Linde, L Lista, Z A Liu,W Lohmann,E Longo,Y S Lu,K Lubelsmeyer, C Luci,D Luckey,L Lugnier, L Luminari, W Lustermann, W G Ma, M Maity, L Malgeri,A Malinin,C Mana,D Mangeol, J Mans,G Marian,J P Martin, F Marzano, K Mazumdar,R R Mcneil,S Mele, L Merola, M Meschini,W J Metzger,M Von Der Mey,A Mihul,H Milcent, G Mirabelli, J Mnich, G B Mohanty,R Moore, T Moulik, G S Muanza,A J M Muijs,B Musicar,M Musy,M Napolitano, F Nessitedaldi, H B Newman,T Niessen, A Nisati, H Nowak, R A Ofierzynski,G Organtini,A Oulianov,C Palomares,D Pandoulas, S Paoletti,P Paolucci,R Paramatti,H K Park,I H Park,G Passaleva, S Patricelli,T Paul, M Pauluzzi, C Paus, F Pauss, M Pedace,S Pensotti,D Perretgallix, B A Petersen, D Piccolo,F Pierella, M Pieri,P A Piroue,E Pistolesi,V Plyaskin, M Pohl,V Pojidaev,H Postema,J Pothier,D Prokofiev,J Quartieri,G Rahalcallot,M A Rahaman, P Raics, N Raja,R Ramelli,P G Rancoita, R Ranieri, A Raspereza,G Raven,P A Razis,D Ren, M Rescigno, S Reucroft,S Riemann,K Riles,J Rodin, B P Roe,Luciano Romero,A Rosca,S Rosierlees,S Roth,C Rosenbleck,B Roux,J A Rubio,G Ruggiero,H Rykaczewski,S Saremi,S Sarkar,J Salicio,E Sanchez, M P Sanders,C Schafer,V A Schegelsky,S Schmidtkaerst,D Schmitz, H Schopper,D J Schotanus, G Schwering,C Sciacca,A Seganti,L Servoli,S Shevchenko,N Shivarov,V Shoutko,E Shumilov,A Shvorob,T Siedenburg,D Son, Brenton T Smith,P Spillantini,M Steuer, D P Stickland,A Stone,B Stoyanov, A Straessner, K Sudhakar, G Sultanov,L Z Sun,S Sushkov,H Suter,J D Swain, Z Szillasi,T Sztaricskai,X W Tang, L Tauscher, L A Taylor,B Tellili, D Teyssier,C Timmermans,Samuel C C Ting, S C Tonwar, J Toth, C Tully,K L Tung,Y Uchida,J Ulbricht,E Valente, G Vesztergombi,I Vetlitsky,D Vicinanza,G Viertel,S Villa,M Vivargent,S Vlachos,I Vodopianov, H Vogel,H Vogt,I Vorobiev,A A Vorobyov,A Vorvolakos,M Wadhwa,W Wallraff,M Wang, X L Wang,Z M Wang,A Weber, M Weber, P Wienemann, H G Wilkens,S X Wu,S Wynhoff,L Xia,Z Z Xu,J Yamamoto,B Z Yang,C G Yang,Hyuk Jun Yang, Minde Yang,J B Ye,S C Yeh,An Zalite,Yu Zalite,Z P Zhang,G Y Zhu,R Y Zhu, A Zichichi,F Ziegler, G Zilizi,B Zimmermann,M Zoller

Physics Letters B（2001）

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摘要

Using data collected with the L3 detector near the Z resonance, corresponding to an integrated luminosity of 150 pb−1, the branching fractions of the tau lepton into electron and muon are measured to be B(τ→eν̄eντ)=(17.806±0.104(stat.)±0.076(syst.))%, B(τ→μν̄μντ)=(17.342±0.110(stat.)±0.067(syst.))%. From these results the ratio of the charged current coupling constants of the muon and the electron is determined to be gμ/ge=1.0007±0.0051. Assuming electron-muon universality, the Fermi constant is measured in tau lepton decays as GF=(1.1616±0.0058)×10−5 GeV−2. Furthermore, the coupling constant of the strong interaction at the tau mass scale is obtained as αs(mτ2)=0.322±0.009(exp.)±0.015(theory).

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