A study of the decays of tau leptons produced on theZ resonance at LEP

P. Abreu,W. Adam,T. Adye,E. Agasi,G. D. Alekseev,P. Allen,S. Almehed,S. J. Alvsvaag,U. Amaldi,E. G. Anassontzis,A. Andreazza,P. Antilogus,W.-D. Apel, R. J. Apsimon, B. Åsman,J.-E. Augustin, A. Augustinus, P. Baillon, P. Bambade, F. Barao,R. Barate,G. Barbiellini,D. Y. Bardin, A. Baroncelli,O. Barring,J. A. Barrio,W. Bartl,M. Berggren,M. Battaglia,M. Baubillier, K.-H. Becks,C. J. Beeston,M. Begalli,P. Beilliere,Yu. Belokopytov,P. Beltran,D. Benedic,M. Berggren,D. Bertrand,F. Bianchi,M. S. Bilenky,P. Billoir,J. Bjarne,D. Bloch,S. Blyth,V. Bocci,P. N. Bogolubov,T. Bolognese,M. Bonesini,W. Bonivento,P. S. L. Booth,P. Borgeaud,G. Borisov,H. Borner,C. Bosio,B. Bostjancic,S. Bosworth,O. Botner,B. Bouquet, C. Bourdarios,T. J. V. Bowcock,M. Bozzo,S. Braibant,P. Branchini,K. D. Brand,R. A. Brenner,H. Briand,C. Bricman,R. C. A. Brown,N. Brummer,J.-M. Brunet, L. Bugge, T. Buran,H. Burmeister,J. A. M. A. Buytaert,M. Caccia, M. Calvi,A. J. Camacho Rozas,T. Camporesi, V. Canale,F. Couchot,F. Carena,L. Carroll,C. Caso,E. Castelli,M. V. Castillo Gimenez, A. Cattai, F. R. Cavallo, L. Cerrito,V. Chabaud,A. Chan,Ph. Charpentier,L. Chaussard,J. Chauveau,P. Checchia, G. A. Chelkov, L. Chevalier,P. Chliapnikov,V. Chorowicz,J. T. M. Chrin,R. Cirio,M. P. Clara,P. Collins,J. L. Contreras,R. Contri,E. Cortina,G. Cosme,F. Couchot,H. B. Crawley,D. Crennell, G. Crosetti,M. Crozon,J. Cuevas Maestro, S. Czellar,S. Dagoret,E. Dahl-Jensen,B. Dalmagne,M. Dam,G. Damgaard, G. Darbo, E. Daubie,A. Daum, P. D. Dauncey,M. Davenport,P. David,W. Da Silva,C. Defoix,D. Delikaris,B. A. Della Riccia,S. Delorme, P. Delpierre,N. Demaria,A. De Angelis,M. De Beer,H. De Boeck,W. De Boer,C. De Clercq,M. D. M. De Fez Laso,N. De Groot,C. De La Vaissiere,B. De Lotto,A. De Min,H. Dijkstra,L. Di Ciaccio, F. Djama,J. Dolbeau,M. Donszelmann, K. Doroba,M. Dracos, J. Drees,M. Dris,Y. Dufour,L.-O. Eek,P. A.-M. Eerola,R. Ehret, T. Ekelof, G. Ekspong,A. Elliot Peisert,J.-P. Engel,D. Fassouliotis,T. A. Fearnley, M. Feindt,A. Fenyuk,M. Fernandez Alonso,A. Ferrer,T. A. Filippas,A. Firestone,H. Foeth,E. Fokitis, F. Fontanelli,K. A. J. Forbes,B. Franek,P. Frenkiel,D. C. Fries,A. G. Frodesen, R. Fruhwirth,F. Fulda-Quenzer,K. Furnival,H. Furstenau,J. Fuster,G. Galeazzi,D. Gamba,C. Garcia,J. Garcia,C. Gaspar, U. Gasparini,Ph. Gavillet,E. N. Gazis,J.-P. Gerber,P. Giacomelli, R. Gokieli,B. Bolob,V. M. Golovatyuk,J. J. Gomez Y Cadenas,A. Goobar,G. Gopal,M. Gorski,V. Gracco,A. Grant,F. Grard,E. Graziani,G. Grosadidier,E. Gross,P. Grosse-Wiesmann,B. Grossetete,S. Gumenyuk,J. Guy,U. Haedinger,F. Hahn,M. Hahn,S. Haider, Z. Hajduk,A. Hakansson, A. Hallgren,K. Hamacher,G. Hamel De Monchenault,W. Hao,F. J. Harris,T. Henkes,J. J. Hernandez, P. Herquet,H. Herr,T. L. Hessing,I. Hietanen,C. O. Higgins,E. Higon,H. J. Hilke,S. D. Hodgson,T. Hofmokl,R. Holmes, S.-O. Holmgren,D. Holthuizen,P. F. Honore,J. E. Hooper, M. Houlden, J. Hrubec,P. O. Hulth, K. Hultqvist, P. Ioannou,D. Isenhower,P.-S. Iversen, J. N. Jackson,P. Jalocha, G. Jarlskog, P. Jarry,B. Jean-Marie,E. K. Johansson, D. Johnson,M. Jonker,L. Jonsson, P. Juillot,G. Kalkanis,G. Kalmus,F. Kapusta,M. Karlsson, E. Karvelas,S. Katsanevas,E. C. Katsoufis,R. Keranen,J. Kesteman,B. A. Khomenko,N. N. Khovanski,B. King,J. J. Kjaer,H. Klein,W. Klempt,A. Klovning, P. Kluit,A. Koch-Mehrin,J. H. Koehne,B. Koene,P. Kokkinias,M. Kopf, K. Korcyl,A. V. Korytov,V. Kostioukhine,C. Kourkoumelis,O. Kouznetsov,P. H. Kramer,J. Krolikowski,I. Kronkvist, J. Krstic,U. Kruener-Marquis,W. Krupinski,K. Kulka,K. Kurvinen, C. Lacasta,C. Lambropoulos,J. W. Lamsa,L. Lanceri,V. Lapin,J.-P. Laugier,R. Lauhakangas,G. Leder,F. Ledroit, R. Leitner,Y. Lemoigne,J. Lemonne, G. Lenzen,V. Lepeltier,J. M. Levy,E. Lieb, D. Liko,E. Lillethun,J. Lindgren,R. Lindner, A. Lipniacka,I. Lippi,B. Loerstad, M. Lokajicek,J. G. Loken,A. Lopez-Fernandez,M. A. Lopez Aguera,M. Los,D. Loukas,J. J. Lozano,P. Lutz, L. Lyons,G. Maehlum,J. Maillard,A. Maltezos,F. Mandl,J. Marco, M. Margoni,J.-C. Marin, A. Markou,T. Maron,S. Marti,L. Mathis,F. Matorras, C. Matteuzzi,G. Matthiae, M. Mazzucato,M. McCubbin,R. Mc Kay,R. Mc Nulty,G. Meola, C. Meroni,W. T. Meyer,M. Michelotto, I. Mikulec,W. A. Mitaroff,G. V. Mitselmakher,U. Mjoernmark, T. Moa,R. Moeller,K. Moenig,M. R. Monge, P. Morettini,H. Mueller, W. J. Murray,B. Muryn,G. Myatt,F. Naraghi,F. L. Navarria,P. Negri,B. S. Nielsen,B. Nijjhar, V. Nikolaenko,P. E. S. Nilsen,P. Niss,V. Obraztsov,A. G. Olshevski, R. Orava,A. Ostankov,K. Osterberg, A. Ouraou, M. Paganoni,R. Pain,H. Palka,Th. D. Papadopoulou, L. Pape,A. Passeri, M. Pegoraro,J. Pennanen,V. Perevozchikov, M. Pernicka, A. Perrotta, A. Petrolini,T. E. Pettersen,F. Pierre,M. Pimenta,O. Pingo, M. E. Pol,G. Polok,P. Poropat,P. Privitera, A. Pullia, D. Radojicic, S. Ragazzi, P. N. Ratoff, A. L. Read,N. G. Redaelli,M. Regler,D. Reid,P. B. Renton,L. K. Resvanis,F. Richard,M. Richardson,J. Ridky,G. Rinaudo,I. Roditi,A. Romero,I. Roncagliolo, P. Ronchese,C. Ronnqvist,E. I. Rosenberg,S. Rossi,U. Rossi,E. Rosso,P. Roudeau,T. Rovelli,W. Ruckstuhl,V. Ruhlmann,A. Ruiz,K. Rybicki,H. Saarikko,Y. Sacquin, G. Sajot, J. Salt,J. Sanchez, M. Sannino,S. Schael,H. Schneider,M. A. E. Schyns, G. Sciolla, F. Scuri,A. M. Segar,R. Sekulin,M. Sessa,G. Sette,R. Seufert,R. C. Shellard,I. Siccama, P. Siegrist,S. Simonetti,F. Simonetti,A. N. Sisakian,T. B. Skaali,G. Skjevling,G. Smadja,G. R. Smith,R. Sosnowski,T. S. Spassoff,E. Spiriti,S. Squarcia,H. Staeck,C. Stanescu, S. Stapnes,G. Stavropoulos,F. Stichelbaut, A. Stocchi, J. Strauss,J. Straver,R. Strub,M. Szczekowski,M. Szeptycka,P. Szymanski,T. Tabarelli, S. Tavernier,O. Tchikilev,G. E. Theodosiou,A. Tilquin,J. Timmermans,V. G. Timofeev,L. G. Tkatchev, T. Todorov,D. Z. Toet,O. Toker,E. Torassa,L. Tortora,M. T. Trainor, D. Treille,U. Trevisan, W. Trischuk,G. Tristram,C. Troncon, A. Tsirou,E. N. Tsyganov, M. Turala,M.-L. Turluer,T. Tuuva,I. A. Tyapkin, M. Tyndel,S. Tzamarias,S. Ueberschaer,O. Ullaland,V. Uvarov, G. Valenti,E. Vallazza,J. A. Valls Ferrer,C. Vander Velde,G. W. Van Apeldoorn,P. Van Dam,W. K. Van Doninck,J. Varela,P. Vaz, G. Vegni,L. Ventura,W. Venus,F. Verbeure,L. S. Vertogradov, D. Vilanova,L. Vitale, E. Vlasov,A. S. Vodopyanov,M. Vollmer,S. Volponi,G. Voulgaris, M. Voutilainen, V. Vrba, H. Wahlen,C. Walck,F. Waldner, M. Wayne,A. Wehr,M. Weierstall,P. Weilhammer,J. Werner,A. M. Wetherell,J. H. Wickens,J. Wikne,G. R. Wilkinson,W. S. C. Williams,M. Winter,D. Wormald,G. Wormser,K. Woschnagg,N. Yamdagni,P. Yepes,A. Zaitsev,A. Zalewska,P. Zalewski,D. Zavrtanik,E. Zevgolatakos,G. Zhang,N. I. Zimin,M. Zito,R. Zuberi,R. Zukanovich Funchal, G. Zumerle,J. Zuniga

European Physical Journal C（1992）

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摘要

From the analysis of a data sample corresponding to an integrated luminosity of 4.63 pb-1 taken during the 1990 run of LEP at centre of mass energies between 88.2 GeV an 94.2 GeV, the tau decays $\tau ^ - \to e^ - \bar v_e v_\tau ,\tau ^ - \to \mu ^ - \bar v_\mu v_\tau ,\tau ^ - \to \pi ^ - (K^ - )v_\tau ,\tau ^ - \to \rho {}^ - v_\tau$ and their charge conjugates have been studied. The following branching ratios have been measured; $BR(\tau ^ - \to e^ - \bar v_e v_\tau ) = 18.6 \pm 0.8(stat.) \pm 0.6(sys.)\% ,$ , $BR\left( {\tau ^ - \to \mu ^ - \bar v_\mu v_\tau } \right) = 17.4 \pm 0.7 \pm 0.6\% ,$ , Br(t- ? p- (K-)vt)=11.9±0.7±0.7%, BR (t- ? ?- vt)= 22.4±0.8±1.3%, in good agreement with world averages. The measured electronic and muonic branching ratios lead to a measurement of the strong coupling constant, as (mt) = 0.26-0.12+0.09. Extrapolating the as value frommt tomZ yields as (mZ) = 0.109-0.028+0.012.

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