Measurement of Ab_FB using inclusive b-hadron decays

6533b7dbfe1ef96bd126f773

RESEARCH PRODUCT

Measurement of Ab_FB using inclusive b-hadron decays

A Heister S Schael R Barate I De Bonis D Decamp C Goy Jp Lees E Merle An Minard B Pietrzyk S Bravo Mp Casado M Chmeissani Jm Crespo E Fernandez M Fernandez Bosman L Garrido E Grauges M Martinez G Merino R Miquel Lm Mir A Pacheco H Ruiz A Colalco Donato Maria Creanza M De Palma Giuseppe Iaselli Giorgio Pietro 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 G Boix O Buchmuller M Cattaneo F Cerutti B Clerbaux G Dissertori H Drevermann Rw Forty M Frank Tc Greening Jb Hansen J Harvey P Janot B Jost M Kado P Mato A Moutoussi F Ranjard L Rolandi D Schlatter O Schneider W Tejessy F Teubert E Tournefier J Ward Z Ajaltouni F Badaud A Falvard P Gay P Henrard J Jousset B Michel S Monteil Jc Montret D Pallin P Perret F Podlyski Jd Hansen Jr Hansen Ph Hansen Bs Nilsson A Waananen A Kyriakis C Markou E Simopoulou A Vayaki K Zachariadou A Blondel G Bonneaud Jc Brient A Rouge A 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 Gp Murtas L Passalacqua M Pepe Altarelli P Spagnolo Aw Halley Jg Lynch P Negus V O'shea C Raine As Thompson S Wasserbaech R Cavanaugh S Dhamotharan C Geweniger P Hanke G Hansper V Hepp Ee Kluge A Putzer J Sommer K Tittel S Werner M Wunsch R Beuselinck Dm Binnie W Cameron Pj Dornan M Girone N Marinelli Jk Sedgbeer Jc Thompson Vm Ghete P Girtler E Kneringer D Kuhn G Rudolph E Bouhova Thacker Ck Bowdery Aj Finch F Foster G Hughes Rwl Jones Mr Pearson Na Robertson I Giehl K Jakobs K Kleinknecht G Quast B Renk E Rohne Hg Sander H Wachsmuth C Zeitnitz A Bonissent J Carr P Coyle O Leroy P Payre D Rousseau M Talby M Aleppo F Ragusa A David H Dietl G Ganis K Huttmann G Lutjens C Mannert W Manner Hg Moser R Settles H Stenzel W Wiedenmann G Wolf J Boucrot O Callot M Davier L Duflot Jf Grivaz P Heusse A Jacholkowska J Lefrancois Jj Veillet I Videau C Yuan G Bagliesi T Boccali G Calderini L Foa A Giammanco A Giassi F Ligabue A Messineo F Palla G Sanguinetti A Sciaba G Sguazzoni R Tenchini A Venturi Pg Verdini Ga Blair G Cowan Mg Green T Medcalf A Misiejuk Ja Strong P Teixeira Dias Von Wimmersperg Toeller Jh Rw Clifft Tr Edgecock Pr Norton Ir Tomalin B Bloch Devaux P Colas S Emery W Kozanecki E Lancon Mc Lemaire E Locci P Perez J Rander Jf Renardy A Roussarie Jp Schuller J Schwindling A Trabelsi B Vallage N Konstantinidis Am Litke G Taylor Cn Booth S Cartwright F Combley M Lehto Lf Thompson K Affholderbach A Bohrer S Brandt C Grupen A Ngac G Prange U Sieler G Giannini J Rothberg Sr Armstrong K Cranmer P Elmer Dps Ferguson Y Gao S Gonzalez Oj Hayes H Hu S Jin J Kile Pa Mcnamara J Nielsen W Orejudos Yb Pan Y Saadi Ij Scott J Walsh Sl Wu X Wu G. Zobernig

subject

Physics Particle physics Aleph Physics and Astronomy (miscellaneous)010308 nuclear & particles physics media_common.quotation_subject Hadron Estimator FOS: Physical sciences Charge (physics)Jet (particle physics)01 natural sciences Asymmetry Vertex (geometry)Standard Model High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex)0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment 010306 general physics Engineering (miscellaneous)Particle Physics - Experiment media_common

description

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-barb decays using inclusive final states is presented. High-performance tagging of b-barb 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^{0,b}_{FB} = 0.1009 +- 0.0027 (stat) +- 0.0015 (syst), corresponding to a value of the effective weak mixing angle of sin^2(theta_W^{eff}) = 0.23193 +- 0.00056.

year	journal	country	edition	language
2001-07-11

10.1007/s100520100812 http://arxiv.org/abs/hep-ex/0107033