Measurement of the forward-backward asymmetries of e+e - → Z → bb̄ and e+e- → Z → cc̄ using prompt leptons

J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, T. Alderweireld, R. Alemany-Fernandez, T. Allmendinger, P. Allport, U. Amaldi, N. Amapane, S. Amato, E. Anashkin, A. Andreazza, S. Andringa, N. Anjos, P. Antilogus, W. D. Apel, Y. Arnoud, S. AskB. Asman, E. Augustin, A. Augustinus, P. Baillon, A. Ballestrero, P. Bambade, R. Barbier, D. Bardin, G. Barker, A. Baroncelli, M. Battaglia, M. Baubillier, K. H. Becks, M. Begalli, A. Behrmann, E. Ben-Haim, N. Benekos, A. Benvenuti, C. Berat, M. Berggren, L. Berntzon, D. Bertrand, M. Besancon, N. Besson, D. Bloch, M. Blom, M. Bluj, M. Bonesini, M. Boonekamp, L. Booth, G. Borisov, O. Botner, B. Bouquet, V. Bowcock, I. Boyko, M. Bracko, R. Brenner, E. Brodet, P. Bruckman, M. Brunet, L. Bugge, P. Buschmann, M. Calvi, T. Camporesi, V. Canale, F. Carena, N. Castro, F. Cavallo, M. Chapkin, Ph Charpentier, P. Checchia, R. Chierici, P. Chliapnikov, J. Chudoba, U. Chung, K. Cieslik, P. Collins, R. Contri, G. Cosme, F. Cossutti, J. Costa, D. Crennell, J. Cuevas, J. D'Hondt, J. Dalmau, T. da Silva, W. da Silva, G. della Ricca, A. de Angelis, W. de Boer, C. de Clercq, B. de Lotto, N. de Maria, A. de Min, L. de Paula, L. di Ciaccio, A. di Simone, K. Doroba, J. Drees, M. Dris, G. Eigen, T. Ekelof, M. Ellert, M. Elsing, C. Espirito Santo, G. Fanourakis, D. Fassouliotis, M. Feindt, J. Fernandez, A. Ferrer, F. Ferro, U. Flagmeyer, H. Foeth, E. Fokitis, F. Fulda-Quenzer, J. Fuster, M. Gandelman, C. Garcia, Ph Gavillet, E. Gazis, R. Gokieli, B. Golob, G. Gomez-Ceballos, P. Goncalves, E. Graziani, G. Grosdidier, K. Grzelak, J. Guy, C. Haag, A. Hallgren, K. Hamacher, K. Hamilton, S. Haug, F. Hauler, V. Hedberg, M. Hennecke, H. Herr, J. Hoffman, S. O. Holmgren, J. Holt, A. Houlden, K. Hultqvist, N. Jackson, G. Jarlskog, P. Jarry, D. Jeans, K. Johansson, D. Johansson, P. Jonsson, C. Joram, L. Jungermann, F. Kapusta, S. Katsanevas, E. Katsoufis, G. Kernel, P. Kersevan, U. Kerzel, A. Kiiskinen, T. King, J. Kjaer, P. Kluit, P. Kokkinias, C. Kourkoumelis, O. Kouznetsov, Z. Krumstein, M. Kucharczyk, J. Lamsa, G. Leder, F. Ledroit, L. Leinonen, R. Leitner, J. Lemonne, V. Lepeltier, T. Lesiak, W. Liebig, D. Liko, A. Lipniacka, H. Lopes, M. Lopez, D. Loukas, P. Lutz, L. Lyons, J. MacNaughton, A. Malek, S. Maltezos, F. Mandl, J. Marco, R. Marco, B. Marechal, M. Margoni, J. C. Marin, C. Mariotti, A. Markou, C. Martinez-Rivero, J. Masik, N. Mastroyiannopoulos, F. Matorras, C. Matteuzzi, F. Mazzucato, M. Mazzucato, R. Mc Nulty, C. Meroni, E. Migliore, W. Mitaroff, U. Mjoernmark, T. Moa, M. Moch, K. Moenig, R. Monge, J. Montenegro, D. Moraes, S. Moreno, P. Morettini, U. Mueller, K. Muenich, M. Mulders, L. Mundim, W. Murray, B. Muryn, G. Myatt, T. Myklebust, M. Nassiakou, F. Navarria, K. Nawrocki, R. Nicolaidou, M. Nikolenko, A. Oblakowska-Mucha, V. Obraztsov, A. Olshevski, A. Onofre, R. Orava, K. Osterberg, A. Ouraou, A. Oyanguren, M. Paganoni, S. Paiano, P. Palacios, H. Palka, D. Papadopoulou, L. Pape, C. Parkes, F. Parodi, U. Parzefall, A. Passeri, O. Passon, L. Peralta, V. Perepelitsa, A. Perrotta, A. Petrolini, J. Piedra, L. Pieri, F. Pierre, M. Pimenta, E. Piotto, T. Podobnik, V. Poireau, E. Pol, G. Polok, P. Poropat, V. Pozdniakov, N. Pukhaeva, A. Pullia, J. Rames, L. Ramler, A. Read, P. Rebecchi, J. Rehn, D. Reid, R. Reinhardt, P. Renton, F. Richard, J. Ridky, M. Rivero, D. Rodriguez, A. Romero, P. Ronchese, P. Roudeau, T. Rovelli, V. Ruhlmann-Kleider, D. Ryabtchikov, A. Sadovsky, L. Salmi, J. Salt, A. Savoy-Navarro, U. Schwickerath, A. Segar, R. Sekulin, M. Siebel, A. Sisakian, G. Smadja, O. Smirnova, A. Sokolov, A. Sopczak, R. Sosnowski, T. Spassov, M. Stanitzki, A. Stocchi, J. Strauss, B. Stugu, M. Szczekowski, M. Szeptycka, T. Szumlak, T. Tabarelli, C. Taffard, F. Tegenfeldt, J. Timmermans, L. Tkatchev, M. Tobin, S. Todorovova, B. Tome, A. Tonazzo, P. Tortosa, P. Travnicek, D. Treille, G. Tristram, M. Trochimczuk, C. Troncon, M. L. Turluer, A. Tyapkin, P. Tyapkin, S. Tzamarias, V. Uvarov, G. Valenti, P. van Dam, J. van Eldik, A. van Lysebetten, N. van Remortel, I. van Vulpen, G. Vegni, F. Veloso, W. Venus, P. Verdier, V. Verzi, D. Vilanova, L. Vitale, V. Vrba, H. Wahlen, J. Washbrook, C. Weiser, D. Wicke, J. Wickens, G. Wilkinson, M. Winter, M. Witek, O. Yushchenko, A. Zalewska, P. Zalewski, D. Zavrtanik, V. Zhuravlov, I. Zimin, A. Zintchenko, M. Zupan

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    Abstract

    The forward-backward asymmetries of the processes e+e - → Z → bb̄ and e+e- → Z → cc̄ were measured from a sample of hadronic Z decays collected by the DELPHI experiment between 1993 and 1995. Enriched samples of bb̄ and cc̄ events were obtained using lifetime information. The tagging of & and c quarks in these samples was based on the semileptonic decay channels b/c → X + μ and b/c → X + e combined with charge flow information from the hemisphere opposite to the lepton. Combining the AFB bb̄ and AFBcc̄ measurements presented in this paper with published results based on 1991 and 1992 DELPHI data samples, the following pole asymmetries were obtained: AFB 0,b = 0.1021 ± 0.0052 (stat) ± 0.0024 (syst) A FB0,c = 0.0728 ± 0.0086 (stat) ± 0.0063 (syst) The effective value of the weak mixing angle derived from these measurements is sin2 θW,efflept = 0.23170 ± 0.00097.
    Original languageEnglish
    Pages (from-to)109-125
    Number of pages16
    JournalEuropean Physical Journal C
    Volume34
    Issue number2
    DOIs
    Publication statusPublished - May 2004

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