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A study of heavy flavor quarks produced in association with top quark pairs at sqrt(s) = 7 TeV using the ATLAS detector

G. Aad S. Abdel Khalek 1 N. Andari 1 E. Augé 1 M. Benoit 1 S. Binet 1 C. Bourdarios 1 C. de la Taille 1 J.B. de Vivie de Regie 1 L. Duflot 1 M. Escalier 1 L. Fayard 1 D. Fournier 1 J.-F. Grivaz 1 S. Henrot-Versillé 1 J. Hrivnac 1 L. Iconomidou-Fayard 1 J. Idarraga 1 M. Kado 1 N. Lorenzo Martinez 1 A. Lounis 1 N. Makovec 1 F. Niedercorn 1 L. Poggioli 1 P. Puzo 1 A. Renaud 1 D. Rousseau 1 G. Rybkin 1 J.B. Sauvan 1 J. Schaarschmidt 1 A.C. Schaffer 1 L. Serin 1 S. Simion 1 R. Tanaka 1 M. Teinturier 1 J.J. Veillet 1 D. Zerwas 1 Z. Zhang 1 C. Biscarat 2 G. Rahal 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 J. Donini 3 E. Dubreuil 3 N. Ghodbane 3 Ph. Gris 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 Daniela Paredes Hernández 3 F. Podlyski 3 C. Santoni 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 N. Berger 4 J. Colas 4 M. Delmastro 4 L. Di Ciaccio 4 T.K.O. Doan 4 S. Elles 4 C. Goy 4 T. Hryn'Ova 4 S. Jézéquel 4 H. Keoshkerian 4 R. Lafaye 4 J. Leveque 4 V.P. Lombardo 4 M. Maeno 4 N. Massol 4 P. Perrodo 4 E. Petit 4 H. Przysiezniak 4 G. Sauvage 4 E. Sauvan 4 M. Schwoerer 4 T. Todorov 4 D. Tsionou 4 I. Wingerter-Seez 4 R. Zitoun 4 S. Albrand 5 Q. Buat 5 B. Clement 5 J. Collot 5 S. Crépé-Renaudin 5 B. Dechenaux 5 T. Delemontex 5 P.A. Delsart 5 M.H. Genest 5 J.Y. Hostachy 5 E. Laisne 5 F. Ledroit-Guillon 5 A. Lleres 5 A. Lucotte 5 F. Malek 5 C. Monini 5 J. Stark 5 X. Sun 5 B. Trocmé 5 M. Barbero 6 C. P. Bee 6 C. Bertella 6 N. Bousson 6 J. C. Clémens 6 Y. Coadou 6 F. Djama 6 F. Etienne 6 L. Feligioni 6 D. Hoffmann 6 F. Hubaut 6 E. B. F. G. Knoops 6 E. Le Guirriec 6 B. Li 6 J. Maurer 6 E. Monnier 6 Y. Nagai 6 J. Odier 6 P. Pralavorio 6 A. Rozanov 6 T. Serre 6 M. Talby 6 N. Tannoury 6 E. Tiouchichine 6 S. Tisserant 6 J. Toth 6 F. Touchard 6 M. Ughetto 6 L. Vacavant 6
Abstract : Using a sample of dilepton top-quark pair (ttbar) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, ttbar + b + X or ttbar + c + X, collectively referred to as ttbar + HF. The dataset used corresponds to an integrated luminosity of 4.7 fb^-1 of proton--proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The dominant background to ttbar + HF in this sample is ttbar + jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result for extra HF production is quoted as a ratio (R_HF) of the cross section for ttbar + HF production to the cross section for ttbar production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. R_HF is measured to be [7.1 +/- 1.3 (stat.) +5.3/-2.0 (syst.)] % for jets with pt > 25 GeV and |eta| < 2.5, compared to the leading-order QCD Standard Model expectation of [3.4 +/- 1.1] %.
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Submitted on : Friday, April 26, 2013 - 10:50:12 AM
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G. Aad, S. Abdel Khalek, N. Andari, E. Augé, M. Benoit, et al.. A study of heavy flavor quarks produced in association with top quark pairs at sqrt(s) = 7 TeV using the ATLAS detector. Physical Review D, American Physical Society, 2014, 89, pp.072012. ⟨10.1103/PhysRevD.89.072012⟩. ⟨in2p3-00818163⟩

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