A Measurement of the Tau(-)-> E(-)(Nu)over-bar(e)nu(tau) Branching Ratio

G. Alexander,J Allison, N. Altekamp,K. Ametewee,K. J. Anderson,S Anderson,S. Arcelli,S. Asai,D. Axen,Georges Azuelos,AH Ball,E. L. Barberio,R. Barlow, R Bartoldus, Batley,G. Beaudoin,J. Bechtluft,G. A. Beck,C. Beeston,T. Behnke,A. J. Bell,K.W. Bell,G. Bella,S Bentvelsen,P. Berlich,S. Bethke,O. Biebel,I.J. Bloodworth,J.E. Bloomer,P. Bock, H. M. Bosch,M. Boutemeur,B. Bouwens,S. Braibant,P. Bright-Thomas,RM Brown,H. Burckhart,C. Burgard,R. Bürgin,Paolo Capiluppi,R.K. Carnegie,AA Carter,Jonathan Carter,C.Y. Chang,C. Charlesworth,D. G. Charlton,D. Chrisman,SL Chu,Pel Clarke,Sg Clowes,Isaac Cohen,J.E. Conboy,O.C. Cooke,Marco Cuffiani, S. Dado,C. Dallapiccola,G. M. Dallavalle,C. Darling,S DeJong, LA delPozo, Dixit,ED Silva,E. Duchovni,G. Duckeck,I.P. Duerdoth,U. C. Dunwoody, J. E. G. Edwards,P. Estabrooks,H Evans,Federica Fabbri,B. Fabbro,P. Fath,F. Fiedler,M. Fierro,M. Fincke-Keeler,H.M. Fischer,R. Folman,D.G. Fong,M. Foucher,H. Fukui,A. Fürtjes,P. Gagnon,A. Gaidot,J. W. Gary,J. Gascon,S.M. Gascon-Shotkin,NI Geddes,C. Geich-Gimbel,Sw Gensler,F.X. Gentit, T. Geralis,Giovanni Giacomelli,Paolo Giacomelli,Roberto Giacomelli, Gibson,WR Gibson,D. M. Gingrich,J. Goldberg,M.J. Goodrick,W. Gorn,Claudio Grandi,E. Gross,Csaba Hajdu,G. Hanson,M. Hansroul, M. Hapke,C.K. Hargrove,P. A. Hart,C. Hartmann,M. Hauschild,C. M. Hawkes,R. J. Hawkings,R.J. Hemingway,G. Herten,R.D. Heuer, Hildreth,J. C. Hill,S. J. Hillier,T. Hilse,Peter R Hobson,D. Hochman,R.J. Homer,A.K. Honma,Dezső Horváth,Robert Howard,RE HughesJones,D. E. Hutchcroft,P. Igo-Kemenes,D.C. Imrie,A. Jawahery,P.W. Jeffreys,H. Jérémie,M. Jimack,André Joly,M. Jones,Rwl Jones,U. Jost,P. Jovanović, D. Karlen, Takashi Kimura,R. Keeler,R.G. Kellog,B. W. Kennedy, B. King,Jack King,Julie Kirk,S. Kluth, Tetsuro Kobayashi,M. Kobel,D. Koetke,T.P. Kokott,S. Komamiya,R. Kowalewski,Thomas Kreß,Peter Krieger,J vonKrogh,P. Kyberd,G. Lafferty,H. Lafoux,R. Lahmann,W. P. Lai,D. Lanske, J. Lauber,J. G. Layter,AM Lee,Éric Lefebvre,D. Lellouch,James Letts,L. Levinson,C. Lewis,S. L. Lloyd,F. K. Loebinger,G.D. Long,B. Lorazo,MJ Losty,J. Ludwig,A. Luig,A. Malik,M Mannelli,Stefano Marcellini,C. Markus,A. J. Martin,J. Martin,Germán Martínez,T. Mashimo,W. Matthews,P. Mättig,W.J. McDonald,J. A. McKenna,E. McKigney,T. McMahon,A. McNab,Frans Meijers,Sven Menke,F. S. Merritt,H. Mes,J. Meyer,A. Michelini,George Mikenberg,DJ Miller,R. Mir,W. Mohr,A. Montanari,Takaaki Mori,M. Morii,U. Müller, B. Nellen, B. Nijjhar,Richard Nisius, S.W. OʼNeale,F. G. Oakham,F. Odorici,H. Ogren,N. J. Oldershaw,T. Omori,C.J. Oram,M. J. Oreglia, S. Orito,M. Palazzo,J. Pálinkás,JP Pansart,G. Pásztor, Pater,G. N. Patrick,M. J. Pearce,P. O. Phillips,JE Pilcher,James Pinfold,D. E. Plane,P. Poffenberger, B. Poli,A. Posthaus,T.W. Pritchard, H. Przysiezniak,D.L. Rees,D. Rigby,M. Rison,S.A. Robins,N. Rodning,J. M. Roney,E. Ros,A. M. Rossi,M. Rosvick, P. Routenburg,Y. Rozen,K. Runge,Ö. Runólfsson,R. Ryłko,E.K.G. Sarkisyan,Michiya Sasaki,Carla Sbarra,A.D. Schaile,O. Schaile,F. Scharf,P. Scharff-Hansen,P. Schenk,B. Schmitt,Matthias Schröder,H.-C. Schultz-Coulon,M. Schulz,P. Schütz,J. Schwiening,W. G. Scott,T. Shears,B. W. Shen,C. H. Shepherd-Themistocleous,Peter Sherwood,G. P. Siroli, A. Sittler, A. Skillman,Andris Skuja,Andrew Smith,Smith Tj,G. A. Snow,R. Sobie,S. Söldner‐Rembold,R. W. Springer, M. Sproston,Achim Stahl,M. Starks,C. Stegmann,K. Stephens, J. Steuerer,B. Stockhausen, D. Strom,F. Strumia,P. Szymański,Réda Tafirout,Hiroshi Takeda,P. Taras,S. Tarem,M. Tecchio,N. Tesch,M. Thomson, E vonTorne,S. Towers,M. Tscheulin,T. Tsukamoto,E. Tsur,A. S. Turcot,M.F. Turner-Watson,P. Utzat,R VanKooten,G. Vasseur,P. Vikas,Manuella Vincter, E.H. Vokurka,F. Wäckerle,A. Wagner,D.L. Wagner,C. P. Ward, Ward,JJ Ward,P. M. Watkins,A. Watson,Nigel Watson,P. Weber,P. S. Wells,N. Wermes,B. Wilkens,G.W. Wilson,J. Wilson,T. Włodek,G. Wolf,Stephen Wotton,T. R. Wyatt,S. Xella,S. Yamashita,G. Yekutieli, Zacek

Physics letters B（1996）

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摘要

The branching ratio for the decay tau(-) --> e(-) (e)nu(tau) has been measured using Z(0) decay data collected by the OPAL experiment at LEP. In total 33 073 tau(-) --> e(-) (e)nu(tau) candidates were identified from a sample of 186 197 selected tau. decays, giving a branching ratio of B(tau(-) --> e(-) (e)nu(tau)) = (17.81 +/- 0.09 (stat) +/- 0.06 (syst))%. This result is combined with other measurements to test e - mu and mu - tau universality in charged-current weak interactions. Additionally, the strong coupling constant alpha(s)(m(tau)(2)) has been extracted from B(tau(-) --> e(-) (e)nu(tau)) and evolved to the Z(0) mass scale, giving alpha(s)(m(Z)(2)) = 0.1204 +/- 0.0011 (exp) +/- 0.0019 (theory). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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