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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
  • Laboratoire de Physique des Particules
  • University of São Paulo
  • INFN Sezione di Bari
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • European Organization for Nuclear Research
  • Université Blaise Pascal
  • Niels Bohr Institutet
  • NCSR Demokritos
  • Department of Physics
  • University of Edinburgh
  • University of Florence
  • Supercomputer Computations Research Institute
  • Florida State University
  • LNF-INFN
  • Department of Physics and Astronomy
  • University of Glasgow
  • Institut für Hochenergiephysik
  • University of Heidelberg
  • Department of Physics
  • Imperial College London
  • Institut für Experimentalphysik
  • University of Innsbruck
  • Lancaster University
  • Institut für Physik
  • Johannes Gutenberg University
  • Université Paris-Sud
  • Max-Planck-Institut für Physik
  • Laboratoire de l'Accélérateur Linéaire
  • Sezione di Roma
  • Scuola Normale Superiore di Pisa
  • King's College London
  • Rutherford Appleton Laboratory
  • Institut Pierre Simon Laplace, CNRS and CEA
  • University of California at Santa Cruz
  • Department of Physics
  • The University of Sheffield
  • Fachbereich Physik
  • Universität Siegen
  • Dipartimento di Fisica
  • University of Trieste
  • University of Wisconsin-Madison

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Precise values of the Z resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 million Z 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 σh 0 =(41.60±0.16) nb, and Rl=20.69±0.09. The corresponding number of light neutrino species is Nv =2.983±0.034. The lepton pair forward-backward asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons:gV 2(MZ 2)/gA 2(MZ 2)=0.0058 ±0.0011. An application of these results to constrain one model with extra Z bosons is presented.

Original languageEnglish
Pages (from-to)539-550
Number of pages12
JournalZeitschrift für Physik C Particles and Fields
Volume62
Issue number4
DOIs
Publication statusPublished - 1 Jan 1994

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