Z production cross sections and lepton pair forward-backward asymmetries

D. Buskulic,D. Casper,I. De Bonis,D. Decamp,P. Chez, C. Goy, J. -P. Lees,M. -N. Minard,P. Odier, B. Pietrzyk,F. Ariztizabal,P. Comas, J. M. Crespo,I. Efthymiopoulos,E. Fernandez, M. Fernandez-Bosman,V. Gaitan, Ll. Garrido,M. Martinez, T. Mattison,S. Orten,A. Pacheco,C. Padilla,A. Pascual, D. Creanza,M. de Palma,A. Farilla,G. Iaselli,G. Maggi,N. Marinelli,S. Natali,S. Nuzzo, A. Ranieri,G. Raso, F. Romano, F. Ruggieri,G. Selvaggi, L. Silvestris,P. Tempesta, G. Zito,Y. Chai,D. Huang,X. Huang,J. Lin, T. Wang,Y. Xie,D. Xu, R. Xu,J. Zhang, L. Zhang,W. Zhao,E. Blucher,G. Bonvicini, J. Boudreau, H. Drevermann,R. W. Forty,G. Ganis, C. Gay,M. Girone,R. Hagelberg,J. Harvey,J. Hilgart,R. Jacobsen, B. Jost, J. Knobloch,I. Lehraus,M. Maggi, C. Markou,P. Mato,H. Meinhard, A. Minten, R. Miquel,K. Moffeit,P. Palazzi,J. R. Pater,J. A. Perlas, P. Perrodo,J. -F. Pusztaszeri,F. Ranjard,L. Rolandi, J. Rothberg,T. Ruan, M. Saich,D. Schlatter, M. Schmelling,F. Sefkow, W. Tejessy, I. R. Tomalin,R. Veenhof,H. Wachsmuth, S. Wasserbaech, W. Wiedenmann, T. Wildish,W. Witzeling, J. Wotschack, Z. Ajaltouni,M. Bardadin-Otwinowska,A. Barres,C. Boyer,A. Falvard, P. Gay, C. Guicheney, P. Henrard,J. Jousset,B. Michel, J. -C. Montret, D. Pallin, P. Perret, F. Podlyski,J. Proriol,F. Saadi,T. Fearnley,J. B. Hansen,J. D. Hansen,J. R. Hansen, P. H. Hansen,S. D. Johnson, R. Møllerud,B. S. Nilsson, A. Kyriakis,E. Simopoulou,I. Siotis,A. Vayaki,K. Zachariadou,J. Badier, A. Blondel,G. Bonneaud,J. C. Brient,P. Bourdon,G. Fouque, L. Passalacqua,A. Rougé,M. Rumpf, R. Tanaka,M. Verderi,H. Videau,D. J. Candlin,M. I. Parsons,E. Veitch, E. Focardi, L. Moneta, G. Parrini, M. Corden,M. Delfino, C. Georgiopoulos,D. E. Jaffe,D. Levinthal,A. Antonelli, G. Bencivenni,G. Bologna,F. Bossi, P. Campana, G. Capon,F. Cerutti, V. Chiarella,G. Felici, P. Laurelli,G. Mannocchi,F. Murtas, G. P. Murtas,M. Pepe-Altarelli,S. Salomone,P. Colrain,I. ten Have,I. G. Knowles,J. G. Lynch, W. Maitland, W. T. Morton, C. Raine,P. Reeves,J. M. Scarr,K. Smith,M. G. Smith, A. S. Thompson, S. Thorn,R. M. Turnbull,U. Becker,O. Braun, C. Geweniger, P. Hanke,V. Hepp, E. E. Kluge,A. Putzer,B. Rensch, M. Schmidt, H. Stenzel,K. Tittel,M. Wunsch, R. Beuselinck, D. M. Binnie,W. Cameron,M. Cattaneo,D. J. Colling,P. J. Dornan,J. F. Hassard, N. Konstantinidis, A. Moutoussi, J. Nash, D. G. Payne,G. San Martin, J. K. Sedgbeer,A. G. Wright, P. Girtler, D. Kuhn, G. Rudolph,R. Vogl,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,A. Galla, A. M. Greene, K. Kleinknecht,J. Raab,B. Renk, H. -G. Sander,H. Schmidt, S. M. Walther,R. Wanke, B. Wolf,A. M. Bencheikh, C. Benchouk,A. Bonissent,D. Calvet,J. Carr,P. Coyle,C. Diaconu, F. Etienne,D. Nicod,P. Payre, L. Roos,D. Rousseau,P. Schwemling, M. Talby,S. Adlung,R. Assmann,C. Bauer, W. Blum,D. Brown,P. Cattaneo,B. Dehning,H. Dietl, F. Dydak,M. Frank,A. W. Halley, K. Jakobs, J. Lauber,G. Lütjens, G. Lutz, W. Männer,H. -G. Moser,R. Richter,J. Schröder,A. S. Schwarz,R. Settles,H. Seywerd,U. Stierlin,U. Stiegler,R. St. Denis,G. Wolf,R. Alemany,J. Boucrot, O. Callot,A. Cordier, M. Davier, L. Duflot, J. -F. Grivaz,Ph. Heusse,P. Janot,D. W. Kim,F. Le Diberder, J. Lefrançois,A. -M. Lutz,G. Musolino,M. -H. Schune,J. -J. Veillet, I. Videau, D. Abbaneo,G. Bagliesi,G. Batignani,U. Bottigli, C. Bozzi, G. Calderini, M. Carpinelli, M. A. Ciocci, V. Ciulli,R. Dell'Orso,I. Ferrante,F. Fidecaro,L. Foa, F. Forti, A. Giassi,M. A. Giorgi,A. Gregorio,F. Ligabue,A. Lusiani,P. S. Marrocchesi,E. B. Martin, A. Messineo,F. Palla,G. Rizzo,G. Sanguinetti,P. Spagnolo,J. Steinberger, R. Tenchini,G. Tonelli,G. Triggiani,A. Valassi,C. Vannini,A. Venturi, P. G. Verdini, J. Walsh,A. P. Betteridge,M. G. Green,D. L. Johnson,P. V. March,T. Medcalf,Ll. M. Mir,I. S. Quazi,J. A. Strong,V. Bertin,D. R. Botterill, R. W. Clifft,T. R. Edgecock,S. Haywood,M. Edwards,P. R. Norton,J. C. Thompson,B. Bloch-Devaux,P. Colas,H. Duarte,S. Emery,W. Kozanecki,E. Lançon,M. C. Lemaire, E. Locci,B. Marx,P. Perez, 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,W. Babbage,E. Beddall,C. N. Booth,S. Cartwright,F. Combley, I. Dawson,C. Rankin,L. F. Thompson,A. Böhrer,S. Brandt,G. Cowan, E. Feigl, C. Grupen,G. Lutters, J. Minguet-Rodriguez,F. Rivera,P. Saraiva,U. Schäfer,L. Smolik,L. Bosisio,R. Della Marina,G. Giannini,B. Gobbo, L. Pitis, F. Ragusa, L. Bellantoni,W. Chen,J. S. Conway,Z. Feng,D. P. S. Ferguson,Y. S. Gao,J. Grahl, J. L. Harton,O. J. Hayes,H. Hu, J. M. Nachtman, Y. B. Pan,Y. Saadi, M. Schmitt,I. Scott, V. Sharma,J. D. Turk,A. M. Walsh,F. V. Weber,Sau Lan Wu,X. Wu,M. Zheng,J. M. Yamartino, G. Zobernig,ALEPH Collaboration

European Physical Journal C（1994）

引用 370|浏览95

暂无评分

摘要

Precise values of theZ resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 millionZ decays into hadrons and charged leptons taken with the ALEPH detector at LEP. A silicon-tungsten luminosity calorimeter was installed in ALEPH in 1992, permitting the determination of the absolute luminosity to a systematic precision of 0.15% (experimental) and 0.25% (theoretical). This is combined with a better understanding of the hadronic event selection and an improved tau pair selection. Including the ALEPH results of the past three years one obtains sh0 =(41.60±0.16) nb, andRl=20.69±0.09. The corresponding number of light neutrino species isNv =2.983±0.034. The lepton pair forward-backward asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons:gV2(MZ2)/gA2(MZ2)=0.0058 ±0.0011. An application of these results to constrain one model with extraZ bosons is presented.

查看译文

关键词

Calorimeter, Production Cross, Event Selection, Production Cross Section, Particle Acceleration

AI 理解论文

溯源树

样例

生成溯源树，研究论文发展脉络

Chat Paper

正在生成论文摘要