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Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration

  • A. Heister
  • , S. Schael
  • , R. Barate
  • , I. De Bonis
  • , D. Decamp
  • , C. Goy
  • , J. P. Lees
  • , E. Merle
  • , M. N. Minard
  • , B. Pietrzyk
  • , G. Boix
  • , S. Bravo
  • , M. P. Casado
  • , M. Chmeissani
  • , J. M. Crespo
  • , E. Fernandez
  • , M. Fernandez-Bosman
  • , Ll Garrido
  • , E. Graugés
  • , M. Martinez
  • G. Merino, R. Miquel, Ll M. Mir, A. Pacheco, H. Ruiz, A. Colaleo, D. Creanza, M. De Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, P. Azzurri, O. Buchmüller, M. Cattaneo, F. Cerutti, B. Clerbaux, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, T. C. Greening, J. B. Hansen, J. Harvey, D. E. Hutchcroft, P. Janot, B. Jost, M. Kado, P. Mato, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, O. Schneider, G. Sguazzoni, W. Tejessy, F. Teubert, A. Valassi, I. Videau, J. Ward, F. Badaud, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, A. Wäänänen, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. C. Brient, A. Rougé, M. Rumpf, M. Swynghedauw, M. Verderi, H. Videau, V. Ciulli, E. Focardi, G. Parrini, A. Antonelli, M. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, L. Passalacqua, M. Pepe-Altarelli, P. Spagnolo, A. W. Halley, J. G. Lynch, P. Negus, V. O'Shea, C. Raine, A. S. Thompson, S. Wasserbaech, R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E. E. Kluge, A. Putzer, J. Sommer, H. Stenzel, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. M. Binnie, W. Cameron, P. J. Dornan, M. Girone, N. Marinelli, J. K. Sedgbeer, J. C. Thomson, V. M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, E. Bouhova-Thacker, C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes, R. W.L. Jones, M. R. Pearson, N. A. Robertson, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, H. G. Sander, H. Wachsmuth, C. Zeitnitz, A. Bonissent, J. Carr, P. Coyle, O. Leroy, P. Payre, D. Rousseau, M. Talby, F. Ragusa, H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, C. Mannert, W. Männer, H. G. Moser, R. Settles, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, M. Davier, L. Duflot, J. F. Grivaz, Ph Heusse, A. Jacholkowska, J. Lefrançois, J. J. Veillet, C. Yuan, G. Bagliesi, T. Boccali, L. Fòa, A. Giammanco, A. Giassi, F. Ligabue, A. Messineo, F. Palla, G. Sanguinetti, A. Sciab`a, R. Tenchini, A. Venturi, P. G. Verdini, G. A. Blair, G. Cowan, M. G. Green, T. Medcalf, A. Misiejuk, J. A. Strong, P. Teixeira-Dias, J. H. von Wimmersperg-Toeller, R. W. Clifft, T. R. Edgecock, P. R. Norton, I. R. Tomalin, B. Bloch-Devaux, P. Colas, S. Emery, W. Kozanecki, E. Lan¸con, M. C. Lemaire, E. Locci, P. Perez, J. Rander, J. F. Renardy, A. Roussarie, J. P. Schuller, J. Schwindling, A. Trabelsi, B. Vallage, N. Konstantinidis, A. M. Litke, G. Taylor, C. N. Booth, S. Cartwright, F. Combley, M. Lehto, L. F. Thompson, K. Affholderbach, A. Böohrer, S. Brandt, C. Grupen, A. Ngac, G. Prange, U. Sieler, G. Giannini, J. Rothberg, S. R. Armstrong, K. Berkelman, K. Cranmer, D. P.S. Ferguson, Y. Gao, S. González, O. J. Hayes, H. Hu, S. Jin, J. Kile, P. A. McNamara, J. Nielsen, Y. B. Pan, J. H. von Wimmersperg-Toeller, W. Wiedenmann, J. Wu, S. L. Wu, X. Wu, G. Zobernig, G. Dissertori
  • RWTH Aachen University
  • Université Paris-Sud
  • University of São Paulo
  • University of Barcelona
  • Ernest Orlando Lawrence Berkeley National Laboratory
  • INFN Sezione di Bari
  • University of Palermo
  • INFN Sezione di Catania
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • European Organization for Nuclear Research
  • Stanford Linear Accelerator Center
  • Allied Signal Inc.
  • University of Lausanne
  • Université Blaise Pascal
  • University of Montpellier (UMR MiVEGEC)
  • Niels Bohr Institutet
  • NCSR Demokritos
  • University of Florence
  • LNF-INFN
  • University of Glasgow
  • Haverford College
  • University of Heidelberg
  • Imperial College London
  • University of Innsbruck
  • Lancaster University
  • Johannes Gutenberg University
  • Sezione INFN di Milano
  • Max-Planck-Institut für Physik
  • Laboratoire de l'Accélérateur Linéaire
  • Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
  • Royal Holloway University of London
  • Rutherford Appleton Laboratory
  • CEA/UVSQ/CNRS
  • University of California at Santa Cruz
  • The University of Sheffield
  • Universität Siegen
  • University of Trieste
  • University of Washington
  • University of Wisconsin-Madison
  • ETH Zurich

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z → bb̄ and Z → cc̄ events and the B 0 -B̄ 0 average mixing parameter χ̄. Quark charges are tagged by the charges of electrons and muons produced in b and e semileptonic decays. Multivariate analyses are used to separate the event flavours and b → ℓ/b → c → ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ̄ = 0.1196 ± 0.0049 (stat.) -0.0050 +0.0043 (syst.), A FB 0,b = 0.0998 ± 0.0040 (stat.) ± 0.0017 (syst.), A FB 0,c = 0.0732 ± 0.0053 (stat.) ± 0.0037 (syst.). These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin 2 θ W eff = 0.23188 ± 0.00046.

langue originaleAnglais
Pages (de - à)177-191
Nombre de pages15
journalEuropean Physical Journal C
Volume24
Numéro de publication2
Les DOIs
étatPublié - 1 janv. 2002

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