Measurement of A(FB)(b) using inclusive b-hadron decays

Heister, A; Schael, S; Barate, R; De Bonis, I; Decamp, D; Goy, C; Lees, Jp; Merle, E; Minard, An; Pietrzyk, B; 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; Colalco, 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, Alessia Rita; 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; Boix, G; Buchmuller, O; Cattaneo, M; Cerutti, F; Clerbaux, B; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Greening, Tc; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Kado, M; Mato, P; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schneider, O; Tejessy, W; Teubert, F; Tournefier, E; Ward, J; Ajaltouni, Z; Badaud, F; Falvard, A; Gay, P; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; 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, A; 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; Spagnolo, P; Halley, Aw; 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; 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; Giehl, I; Jakobs, K; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; Wachsmuth, H; Zeitnitz, C; Bonissent, A; Carr, J; Coyle, P; Leroy, O; Payre, P; Rousseau, D; Talby, M; Aleppo, M; Ragusa, F; David, A; Dietl, H; Ganis, G; Huttmann, K; Lutjens, G; Mannert, C; Manner, W; Moser, Hg; Settles, R; Stenzel, H; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Lefrancois, J; Veillet, Jj; Videau, I; Yuan, C; Bagliesi, G; Boccali, T; Calderini, G; Foa, L; Giammanco, A; Giassi, A; Ligabue, F; Messineo, A; Palla, F; Sanguinetti, G; Sciaba, A; Sguazzoni, G; 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; Cranmer, K; Elmer, P; Ferguson, Dps; Gao, Y; Gonzalez, S; Hayes, Oj; Hu, H; Jin, S; Kile, J; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, Sl; Wu, X; Zobernig, G.

doi:10.1007/s100520100812

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Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z --> b (b) over bar decays using inclusive final states is presented. High-performance tagging of b (b) over bar events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A(FB)(o,b) = 0.1011 +/- 0.0012 (syst), corresponding to a value of the effective weak mixing angle of sin(2)theta(W)(eff) = 0.23189 +/- 0.00056. RI ANTONELLI, ANTONELLA/C-6238-2011; Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010

Titolo:	Measurement of A(FB)(b) using inclusive b-hadron decays
Autori interni:	Heister A Schael S Barate R De Bonis I Decamp D Goy C Lees JP Merle E Minard AN Pietrzyk B 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 Colalco 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, Alessia Rita 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 Boix G Buchmuller O Cattaneo M Cerutti F Clerbaux B Dissertori G Drevermann H Forty RW Frank M Greening TC Hansen JB Harvey J Janot P Jost B Kado M Mato P Moutoussi A Ranjard F Rolandi L Schlatter D Schneider O Tejessy W Teubert F Tournefier E Ward J Ajaltouni Z Badaud F Falvard A Gay P Henrard P Jousset J Michel B Monteil S Montret JC Pallin D Perret P Podlyski F 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 A 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 Spagnolo P Halley AW 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 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 Giehl I Jakobs K Kleinknecht K Quast G Renk B Rohne E Sander HG Wachsmuth H Zeitnitz C Bonissent A Carr J Coyle P Leroy O Payre P Rousseau D Talby M Aleppo M Ragusa F David A Dietl H Ganis G Huttmann K Lutjens G Mannert C Manner W Moser HG Settles R Stenzel H Wiedenmann W Wolf G Boucrot J Callot O Davier M Duflot L Grivaz JF Heusse P Jacholkowska A Lefrancois J Veillet JJ Videau I Yuan C Bagliesi G Boccali T Calderini G Foa L Giammanco A Giassi A Ligabue F Messineo A Palla F Sanguinetti G Sciaba A Sguazzoni G 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 Cranmer K Elmer P Ferguson DPS Gao Y Gonzalez S Hayes OJ Hu H Jin S Kile J McNamara PA Nielsen J Orejudos W Pan YB Saadi Y Scott IJ Walsh J Wu SL Wu X Zobernig G. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2001
Rivista:	THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS
Abstract:	Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z --> b (b) over bar decays using inclusive final states is presented. High-performance tagging of b (b) over bar events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A(FB)(o,b) = 0.1011 +/- 0.0012 (syst), corresponding to a value of the effective weak mixing angle of sin(2)theta(W)(eff) = 0.23189 +/- 0.00056. RI ANTONELLI, ANTONELLA/C-6238-2011; Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010
Handle:	http://hdl.handle.net/20.500.11769/13530
Appare nelle tipologie:	1.1 Articolo in rivista

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