Update of electroweak parameters fromZ decays

D. Buskulic,D. Decamp, C. Goy, J.-P. Lees,M. N. Minard,B. Mours, B. Pietrzyk,R. Alemany,F. Ariztizabal,P. Comas,J. M. Crespo,M. Delfino, E. Fernandez,M. Fernandez-Bosman,V. Gaitan, Ll. Garrido, T. Mattison,A. Pacheco,C. Padilla,A. Pascual, D. Creanza, M. de Palma, A. Farilla, G. Iaselli,G. Maggi,M. Maggi,S. Natali,S. Nuzzo,M. Quattromini,A. Ranieri,G. Raso, F. Romano, F. Ruggieri,G. selvaggi,L. Silvestris,P. Tempesta, G. Zito,Y. Chai,H. Hu,D. Huang,X. Huang,J. Lin, T. Wang,Y. Xie,D. Xu, R. Xu,J. Zhang, L. Zhang,W. Zhao, L. A. T. Bauerdick,E. Blucher,G. Bonvicini, J. Boudreau,D. Casper, H. Drevermann,R. W. Forty,G. Ganis, C. Gay,R. Hagelberg,J. Harvey,S. Haywood,J. Hilgart, R. Jacobsen, B. Jost,J. Knobloch,I. Lehraus, T. Lohse,A. Lusiani,M. Martinez,P. Mato,H. Meinhard, A. Minten, A. Miotto,R. Miquel, H.-G. Moser,P. Palazzi,J. A. Perlas,J.-F. Pusztaszeri,F. Ranjard, G. Redlinger,L. Rolandi, J. Rothberg,T. Ruan,M. Saich,D. Schlatter, M. Schmelling,F. Sefkow,W. Tejessy,H. Wachsmuth, W. Wiedenmann,T. Wildish,W. Witzeling, J. Wotschack, Z. Ajaltouni,F. Badaud,M. Bardadin-Otwinowska,R. El Fellous,A. Falvard, P. Gay, C. Guicheney, P. Henrard,J. Jousset,B. Michel,J. C. Montret, D. Pallin, P. Perret,F. Podlyski,J. Proriol,F. Prulhière,F. Saadi,T. Fearnley,J. D. Hansen,J. R. Hansen,P. H. Hansen,R. Møllerud,B. S. Nilsson,I. Efthymiopoulos, A. Kyriakis,E. Simopoulou,A. Vayaki,K. Zachariadou,J. Badier, A. Blondel,G. Bonneaud,J. C. Brient,G. Fouque,S. Orteu,A. Rougé,M. Rumpf, R. Tanaka,M. Verderi,H. Videau,D. J. Candlin,M. I. Parsons,E. Veitch,L. Moneta, G. Parrini,M. Corden,C. Georgiopoulos,M. Ikeda,J. Lannutti,D. Levinthal,M. Mermikides,L. Sawyer, S. Wasserbaech,A. Antonelli,R. Baldini, G. Bencivenni,G. Bologna,F. Bossi, P. Campana,G. Capon,F. Cerutti, V. Chiarella,B. D'Ettorre-Piazzoli,G. Felici,P. Laurelli,G. Mannocchi, F. Murtas,G. P. Murtas,L. Passalacqua,M. Pepe-Altarelli,P. Picchi,P. Colrain,I. ten Have,J. G. Lynch,W. Maitland,W. T. Morton,C. Raine,P. Reeves,J. M. Scarr,K. Smith,M. G. Smith, A. S. Thompson,R. M. Turnbull,B. Brandl,O. Braun, C. Geweniger, P. Hanke,V. Hepp, E. E. Kluge,Y. Maumary,A. Putzer,B. Rensch,A. Stahl,K. Tittel,M. Wunsch,A. T. Belk, R. Beuselinck, D. M. Binnie,W. Cameron,M. Cattaneo,D. J. Colling,P. J. Dornan,S. Dugeay,A. M. Greene,J. F. Hassard,N. M. Lieske, J. Nash,D. G. Payne,M. J. Phillips,J. K. Sedgbeer, I. R. Tomalin,A. G. Wright, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph,C. K. Bowdery,T. J. Brodbeck, A. J. Finch,F. Foster, G. Hughes,D. Jackson,N. R. Keemer,M. Nuttall,A. Patel, T. Sloan,S. W. Snow,E. P. Whelan, K. Kleinknecht, J. Raab,B. Renk, H.-G. Sander,H. Schmidt,F. Steeg, S. M. Walther,R. Wanke,B. Wolf,S. Adlung,R. Assmann,C. Bauer, W. Blum,D. Brown,P. Cattaneo,B. Dehning,H. Dietl,F. Dydak,M. Frank,A. W. Halley,J. Lauber,G. Lütjens, G. Lutz,W. Männer,R. Richter,H. Rotscheidt, J. Schröder,A. S. Schwarz,R. Settles,H. Seywerd,U. Stierlin,U. Stiegler,R. St. Denis,G. Wolf,J. Boucrot, O. Callot,A. Cordier, M. Davier, L. Duflot, J.-F. Grivaz,Ph. Heusse,D. E. Jaffe, P. Janot,D. W. Kim,F. Le Diberder,J. Lefrançois,A.-M. Lutz,M.-H. Schune,J.-J. Veillet, I. Videau,Z. Zhang, D. Abbaneo, G. Bagliesi,G. Batignani,L. Bosisio,U. Bottigli, C. Bozzi, G. Calderini,M. Carpinelli, M. A. Ciocci, R. Dell'Orso,I. Ferrante,F. Fidecaro,L. Foà, E. Focardi, F. Forti, A. Giassi,M. A. Giorgi,A. Gregorio,F. Ligabue, E. B. Mannelli,P. S. Marrocchesi, A. Messineo, F. Palla,G. Rizzo,G. Sanguinetti,P. Spagnolo,J. Steinberger, R. Tenchini, G. Tonelli,G. Griggiani,C. Vannini,A. Venturi, P. G. Verdini, J. Walsh,A. P. Betteridge,J. M. Carter, M. G. Green,P. V. March,Ll. M. Mir,T. Medcalf,I. S. Quazi,J. A. Strong,L. R. West,J.-J. Aubert,A. M. Bencheikh, C. Benchouk,A. Bonissent,J. Carr,P. Coyle,J. Drinkard, F. Etienne,D. Nicod,S. Papalexiou,P. Payre, L. Roos,D. Rousseau,P. Schwemling, M. Talby,D. R. Botterill,R. W. Clift,T. R. Edgecock,M. Edwards, S. M. Fisher,T. J. Jones,P. R. Norton,D. P. Salmon,J. C. Thompson,B. Bloch-Devaux,P. Colas,H. Duarte,W. Kozanecki,E. Lançon,M. C. Lemaire, E. Locci,P. Perez,F. Perrier, J. Rander,J.-F. Renardy, A. Rosowsky,A. Roussarie,J.-P. Schuller, J. Schwindling,D. Si Mohand,B. Vallage,R. P. Johnson, A. M. Litke,G. Taylor,J. Wear,J. G. Ashman,W. Babbage,C. N. Booth,C. Buttar,R. E. Carney,S. Cartwright,F. Combley,F. Hatfied,L. F. Thompson, E. Barberio,A. Böhrer,S. Brandt, G. Cowan, C. Grupen,G. Lutters,F. Rivera,U. Schäfer,L. Smolik,R. Della Marina,G. Giannini,B. Gobbo, F. Ragusa, L. Bellantoni,W. Chen,D. Cinabro,J. S. Conway,D. F. Cowen,Z. Feng,D. P. S. Ferguson,Y. S. Gao,J. Grahl,J. L. Harton,R. C. Jared,B. W. LeClaire,C. Lishka,Y. B. Pan,J. R. Pater,Y. Saadi,V. Sharma, M. Schmitt,Z. H. Shi,A. M. Walsh,F. V. Weber,Sau Lan Wu,X. Wu,M. Zheng, G. Zobernig

European Physical Journal C（1993）

Cited 12|Views117

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Abstract

Based on 520 000 fermion pairs accumulated during the first three years of data collection by the ALEPH detector at LEP, updated values of the resonance parameters of theZ are determined to beMZ=(91.187±0.009) GeV, GZ=(2.501±0.012) GeV, shad0=(41.60±0.27) nb, andRl=20.78±0.13. The corresponding number of light neutrino species isN?=2.97±0.05. The forward-backward asymmetry in lepton-pair decays is used to determine the ratio of vector to axial-vector couplings of leptons:gV2(MZ2)/gA2(MZ2)=0.0052±0.0016. Combining this with ALEPH measurements of theb andc quark asymmetries and t polarization gives sin2?Weff=0.2326±0.0013. Assuming the minimal Standard Model, and including measurements ofMW/MZ fromp $\bar p$ colliders and neutrino-nucleon scattering, the mass of the top quark is $M_{top} = 156 \pm \begin{array}{*{20}c} {22} \\ {25} \\ \end{array} \pm \begin{array}{*{20}c} {17} \\ {22Higgs} \\ \end{array}$ GeV.

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