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 and events and the average mixing parameter . Quark charges are tagged by the charges of electrons and muons produced in and semileptonic decays. Multivariate analyses are used to separate the event flavours and / processes. The and quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ¯=0.1196±0.0049(stat.)+0.0043−0.0050(syst.),A0,bFB=0.0998±0.0040(stat.)±0.0017(syst.),A0,cFB=0.0732±0.0053(stat.)±0.0037(syst) These asymmetries, combined with the Aleph measurements of the asymmetry using inclusive hadron decays and of the asymmetry using reconstructed mesons, correspond to a value of the effective electroweak mixing angle of sin2θeffW=0.23188±0.00046.
Measurement of the forward-backward asymmetry in Z -> b(b)over-bar and Z -> c(c)over-bar decays with leptons / Heister, A.; Schael, S.; Barate, R.; De Bonis, I.; Focardi, Ettore; Goy, C.; Lees, J. P.; Merle, E.; Minard, M. N.; Pietrzyk, B.; Boix, G.; Bravo, S.; Casado, M. P.; Chmeissani, M.; Crespo, J. M.; Fernandez, E.; Fernandez Bosman, M.; Garrido, L.; Grauges, E.; Martinez, M.; Merino, G.; Miquel, R.; Mir, L. M.; Pacheco, A.; Ruiz, H.; Colaleo, A.; Creanza, D.; de Palma, M.; Iaselli, G.; Maggi, G.; Maggi, M.; Nuzzo, S.; Ranieri, A.; Raso, G.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Tricomi, A.; Zito, G.; Huang, X.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Azzurri, P.; Buchmuller, O.; Cattaneo, M.; Cerutti, F.; Clerbaux, B.; Drevermann, H.; Forty, R. W.; Frank, M.; Gianotti, F.; Greening, T. C.; Hansen, J. B.; Harvey, J.; Hutchcroft, D. E.; Janot, P.; Jost, B.; Kado, M.; Mato, P.; Moutoussi, A.; Ranjard, F.; Rolandi, L.; Schlatter, D.; Schneider, O.; Sguazzoni, G.; Tejessy, W.; Teubert, F.; Valassi, A.; Videau, I.; Ward, J.; Badaud, F.; Falvard, A.; Gay, P.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J. C.; Pallin, D.; Perret, P.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Nilsson, B. S.; Waananen, A.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Vayaki, A.; Zachariadou, K.; Blondel, A.; Bonneaud, G.; Brient, J. C.; Rouge, A.; Rumpf, M.; Swynghedauw, M.; Verderi, M.; Videau, H.; Ciulli, Vitaliano; Focardi, E.; Parrini, G.; Antonelli, A.; Antonelli, M.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Chiarella, V.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G. P.; Passalacqua, L.; Pepe Altarelli, M.; Halley, A.; Lynch, J. G.; Negus, P.; O'Shea, V.; Raine, C.; Thompson, A. S.; Wasserbaech, S.; Cavanaugh, R.; Dhamotharan, S.; Geweniger, C.; Hanke, P.; Hansper, G.; Hepp, V.; Kluge, E. E.; Putzer, A.; Sommer, J.; Stenzel, H.; Tittel, K.; Werner, S.; Wunsch, M.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Dornan, P. J.; Girone, M.; Marinelli, N.; Sedgbeer, J. K.; Thompson, J. C.; Ghete, V. M.; Girtler, P.; Kneringer, E.; Kuhn, D.; Rudolph, G.; Bouhova Thacker, E.; Bowdery, C. K.; Finch, A. J.; Foster, F.; Hughes, G.; R. W. L., ; Pearson, M. R.; Robertson, N. A.; Jakobs, K.; Kleinknecht, K.; Quast, G.; Renk, B.; Sander, H. G.; Wachsmuth, H.; Zeitnitz, C.; Bonissent, A.; Carr, J.; Coyle, P.; Leroy, O.; Payre, P.; Rousseau, D.; Talby, M.; Ragusa, F.; David, A.; Dietl, H.; Ganis, G.; Huttmann, K.; Lutjens, G.; Mannert, C.; Manner, W.; Moser, H. G.; Settles, R.; Wiedenmann, W.; Wolf, G.; Boucrot, J.; Callot, O.; Davier, M.; Duflot, L.; Grivaz, J. F.; Heusse, P.; Jacholkowska, A.; Lefrancois, J.; Veillet, J. J.; Yuan, C.; Bagliesi, G.; Boccali, T.; Foa, L.; Giammanco, A.; Giassi, A.; Ligabue, F.; Messineo, A.; Palla, F.; Sanguinetti, G.; Sciaba, A.; Tenchini, R.; Venturi, A.; Verdini, P. G.; Blair, G. A.; Cowan, G.; Green, M. G.; Medcalf, T.; Misiejuk, A.; Strong, J. A.; Teixeira Dias, P.; Von, J. H.; Clifft, R. W.; Edgecock, T. R.; Norton, P. R.; Tomalin, I. R.; Bloch Devaux, B.; Colas, P.; Emery, S.; Kozanecki, W.; Lancon, E.; Lemaire, M. C.; Locci, E.; Perez, P.; Rander, J.; Renardy, J. F.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Trabelsi, A.; Vallage, B.; Konstantinidis, N.; Litke, A. M.; Taylor, G.; Booth, C. N.; Cartwright, S.; Combley, F.; Lehto, M.; Thompson, L. F.; Affholderbach, K.; Bohrer, A.; Brandt, S.; Grupen, C.; Ngac, A.; Prange, G.; Sieler, U.; Giannini, G.; Rothberg, J.; Armstrong, S. R.; Berkelman, K.; Cranmer, K.; D. P. S., ; Gao, Y.; Gonzalez, S.; Hayes, O. J.; Hu, H.; Jin, S.; Kile, J.; Mcnamara, P. A.; Nielsen, J.; Pan, Y. B.; Von, J. H.; Wiedenmann, W.; Wu, J.; S. L., Wu; Wu, X.; Zobernig, G.; Dissertori, G.; Aleph, Collaboration. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 24:(2002), pp. 177-191. [10.1007/s100520200950]
Measurement of the forward-backward asymmetry in Z -> b(b)over-bar and Z -> c(c)over-bar decays with leptons
FOCARDI, ETTORE;CIULLI, VITALIANO;
2002
Abstract
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 and events and the average mixing parameter . Quark charges are tagged by the charges of electrons and muons produced in and semileptonic decays. Multivariate analyses are used to separate the event flavours and / processes. The and quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ¯=0.1196±0.0049(stat.)+0.0043−0.0050(syst.),A0,bFB=0.0998±0.0040(stat.)±0.0017(syst.),A0,cFB=0.0732±0.0053(stat.)±0.0037(syst) These asymmetries, combined with the Aleph measurements of the asymmetry using inclusive hadron decays and of the asymmetry using reconstructed mesons, correspond to a value of the effective electroweak mixing angle of sin2θeffW=0.23188±0.00046.File | Dimensione | Formato | |
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