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Measurement of the forward-backward asymmetry in Z -> b(b)over-bar and Z -> c(c)over-bar decays with leptons
Authors :
Heister, A Schael, S Barate, R De Bonis, I Decamp, D Goy, C Lees, Jp Merle, E Minard, Mn Pietrzyk, B Boix, G Bravo, S Casado, Mp Chmeissani, M Crespo, Jm Fernandez, E Fernandez Bosman, M Garrido, L Grauges, E Martinez, M Merino, G Miquel, R Mir, Lm 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, Rw Frank, M Gianotti, F Greening, Tc Hansen, Jb Harvey, J Hutchcroft, De 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, Jc Pallin, D Perret, P Hansen, Jd Hansen, Jr Hansen, Ph Nilsson, Bs Waananen, A Kyriakis, A Markou, C Simopoulou, E Vayaki, A Zachariadou, K Blondel, A Bonneaud, G Brient, Jc Rouge, A Rumpf, M Swynghedauw, M Verderi, M Videau, H Ciulli, V 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, Gp Passalacqua, L Pepe Altarelli, M Halley, A Lynch, Jg Negus, P O'Shea, V Raine, C Thompson, As Wasserbaech, S Cavanaugh, R Dhamotharan, S Geweniger, C Hanke, P Hansper, G Hepp, V Kluge, Ee Putzer, A Sommer, J Stenzel, H Tittel, K Werner, S Wunsch, M Beuselinck, R Binnie, Dm Cameron, W Dornan, Pj Girone, M Marinelli, N Sedgbeer, Jk Thompson, Jc Ghete, Vm Girtler, P Kneringer, E Kuhn, D Rudolph, G Bouhova Thacker, E Bowdery, Ck Finch, Aj Foster, F Hughes, G Jones, Rwl Pearson, Mr Robertson, Na Jakobs, K Kleinknecht, K Quast, G Renk, B Sander, Hg 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, Hg Settles, R Wiedenmann, W Wolf, G Boucrot, J Callot, O Davier, M Duflot, L Grivaz, Jf Heusse, P Jacholkowska, A Lefrancois, J Veillet, Jj Yuan, C Bagliesi, G Boccali, T Foa, L Giammanco, A Giassi, A Ligabue, F Messineo, ALBERTO MARIA Palla, F Sanguinetti, G Sciaba, A Tenchini, R Venturi, A Verdini, Pg Blair, Ga Cowan, G Green, Mg Medcalf, T Misiejuk, A Strong, Ja Teixeira Dias, P von Wimmersperg Toeller JH Clifft, Rw Edgecock, Tr Norton, Pr Tomalin, Ir Bloch Devaux, B Colas, P Emery, S Kozanecki, W Lancon, E Lemaire, Mc Locci, E Perez, P Rander, J Renardy, Jf Roussarie, A Schuller, Jp Schwindling, J Trabelsi, A Vallage, B Konstantinidis, N Litke, Am Taylor, G Booth, Cn Cartwright, S Combley, F Lehto, M Thompson, Lf Affholderbach, K Bohrer, A Brandt, S Grupen, C Ngac, A Prange, G Sieler, U Giannini, G Rothberg, J Armstrong, Sr Berkelman, K Cranmer, K Ferguson, Dps Gao, Y Gonzalez, S Hayes, Oj Hu, H Jin, S Kile, J Mcnamara, Pa Nielsen, J Pan, Yb Wu, J Wu, Sl Wu, X Zobernig, G Dissertori, G. Heister, A Schael, S Barate, R De Bonis, I Decamp, D Goy, C Lees, Jp Merle, E Minard, Mn Pietrzyk, B Boix, G Bravo, S Casado, Mp Chmeissani, M Crespo, Jm Fernandez, E Fernandez Bosman, M Garrido, L Grauges, E Martinez, M Merino, G Miquel, R Mir, Lm 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, Rw Frank, M Gianotti, F Greening, Tc Hansen, Jb Harvey, J Hutchcroft, De Janot, P Jost, B Kado, M Mato, P Moutoussi, A Ranjard, F Rolandi, Luigi 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, Jc Pallin, D Perret, P Hansen, Jd Hansen, Jr Hansen, Ph Nilsson, B Waananen, A Kyriakis, A Markou, C Simopoulou, E Vayaki, A Zachariadou, K Blondel, A Bonneaud, G Brient, Jc Rouge, A Rumpf, M Swynghedauw, M Verderi, M Videau, H Ciulli, V 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, Gp Passalacqua, L Pepe Altarelli, M Halley, A Lynch, Jg Negus, P O'Shea, V Raine, C Thompson, A Wasserbaech, S Cavanaugh, R Dhamotharan, S Geweniger, C Hanke, P Hansper, G Hepp, V Kluge, Ee Putzer, A Sommer, J Stenzel, H Tittel, K Werner, S Wunsch, M Beuselinck, R Binnie, Dm Cameron, W Dornan, Pj Girone, M Marinelli, N Sedgbeer, Jk Thompson, Jc Ghete, Vm Girtler, P Kneringer, E Kuhn, D Rudolph, G Bouhova Thacker, E Bowdery, Ck Finch, Aj Foster, F Hughes, G Jones, Rwl Pearson, Mr Robertson, Na Jakobs, K Kleinknecht, K Quast, G Renk, B Sander, Hg 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, Hg Settles, R Wiedenmann, W Wolf, G Boucrot, J Callot, O Davier, M Duflot, L Grivaz, Jf Heusse, P Jacholkowska, A Lefrancois, J Veillet, Jj Yuan, C Bagliesi, G Boccali, T Foa, L Giammanco, A Giassi, A Ligabue, Franco Messineo, A Palla, F Sanguinetti, G Sciaba, A Tenchini, R Venturi, A Verdini, Pg Blair, Ga Cowan, G Green, Mg Medcalf, T Misiejuk, A Strong, Ja Teixeira Dias, P von Wimmersperg Toeller, Jh Clifft, Rw Edgecock, Tr Norton, Pr Tomalin, Ir Bloch Devaux, B Colas, P Emery, S Kozanecki, W Lancon, E Lemaire, Mc Locci, E Perez, P Rander, J Renardy, Jf Roussarie, A Schuller, Jp Schwindling, J Trabelsi, A Vallage, B Konstantinidis, N Litke, Am Taylor, G Booth, Cn Cartwright, S Combley, F Lehto, M Thompson, Lf Affholderbach, K Bohrer, A Brandt, S Grupen, C Ngac, A Prange, G Sieler, U Giannini, G Rothberg, J Armstrong, Sr Berkelman, K Cranmer, K Ferguson, Dp Gao, Y Gonzalez, S Hayes, Oj Hu, H Jin, S Kile, J Mcnamara, Pa Nielsen, J Pan, Yb Wu, J Wu, Sl Wu, X Zobernig, G Dissertori, G.
Publication Year :
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 Z --> b (b) over bar and Z --> cc events and the B(0)-(B) over bar (0) average mixing parameter (chi) over bar. Quark charges are tagged by the charges of electrons and muons produced in b and c 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 (chi) over bar = 0.1196 +/- 0.0049 (stat.) (+0.0043)(-0.0050) (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)theta(W)(eff) = 0.23188 +/- 0.00046.
Details
Language :
English
Database :
OpenAIRE
Accession number :
edsair.dedup.wf.001..4f32016495bf4f32715d38366010b91a