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Journal Articles Physical Review D Year : 2014

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)
G. Aad
E. Augé
D. Rousseau
Z. Zhang
S. Calvet
N. Berger
C. Goy
T. Hryn'Ova
Y. Coadou

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] %.

Dates and versions

in2p3-00818163 , version 1 (26-04-2013)

Identifiers

Cite

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, 2014, 89, pp.072012. ⟨10.1103/PhysRevD.89.072012⟩. ⟨in2p3-00818163⟩
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