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Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

G. Aad S. Albrand 1 M.L. Andrieux 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 P.A. Delsart 1 J. Donini 1 J.Y. Hostachy 1 E. Laisne 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 P. Martin 1 F. Polci 1 J. Stark 1 X. Sun 1 B. Trocmé 1 C. Weydert 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 H. Bachacou 3 H. Abreu 4 N. Andari 4 C. Arnault 4 E. Augé 4 P. Barrillon 4 M. Benoit 4 S. Binet 4 J.-B. Blanchard 4 C. Bourdarios 4 D. Breton 4 C. Collard 4 C. de la Taille 4 J.B. de Vivie de Regie 4 S. Diglio 4 L. Duflot 4 M. Escalier 4 A.C. Falou 4 L. Fayard 4 D. Fournier 4 J.-F. Grivaz 4 M. Heller 4 S. Henrot-Versillé 4 J. Hrivnac 4 L. Iconomidou-Fayard 4 J. Idarraga 4 M. Kado 4 A. Lounis 4 N. Makovec 4 P. Matricon 4 F. Niedercorn 4 L. Poggioli 4 P. Puzo 4 A. Renaud 4 D. Rousseau 4 X. Ruan 4 G. Rybkin 4 J.B. Sauvan 4 J. Schaarschmidt 4 A.C. Schaffer 4 L. Serin 4 S. Simion 4 R. Tanaka 4 J.J. Veillet 4 I. Vukotic 4 F. Wicek 4 D. Zerwas 4 Zhiqing Zhang 4 T. Beau 5 S. Bordoni 5 G. Calderini 5 A. Camard 5 P. Cavalleri 5 E. Chareyre 5 S. de Cecco 5 F. Derue 5 D. Imbault 5 M.W. Krasny 5 D. Lacour 5 B. Laforge 5 O. Le Dortz 5 J. Lellouch 5 G. Marchiori 5 I. Nikolic-Audit 5 J. Ocariz 5 M. Ridel 5 L. Roos 5 Ph. Schwemling 5 Timothée Theveneaux-Pelzer 5 S. Trincaz-Duvoid 5 T.N. Trinh 5 F. Vannucci 6 Emmanuel Busato 7 D. Calvet 7 S. Calvet 7 Reina Coromoto Camacho Toro 7 Diane Cinca 8 R. Febbraro 7 N. Ghodbane 7 C. Guicheney 7 H. Liao 7 D. Pallin 7 F. Podlyski 7 C. Santoni 7 L. P. Says 7 F. Vazeille 7 L. Aperio Bella 9 B. Aubert 9 N. Berger 9 J. Colas 9 L. Di Ciaccio 9 T.K.O. Doan 9 S. Elles 9 P. Ghez 9 C. Goy 9 T. Guillemin 9 L. Helary 9 T. Hryn'Ova 9 G. Ionescu 9 A. Jérémie 9 S. Jézéquel 9 M. Kataoka 9 J. Labbe 9 R. Lafaye 9 J. Leveque 9 V.P. Lombardo 9 N. Massol 9 P. Perrodo 9 H. Przysiezniak 9 E. Richter-Was 9 G. Sauvage 9 E. Sauvan 9 T. Todorov 9 D. Tsionou 9 I. Wingerter-Seez 9 R. Zitoun 9 Y. Zolnierowski 9 S. Aoun 10 C. P. Bee 10 C. Benchouk 10 K. Bernardet 10 N. Bousson 10 J. C. Clémens 10 Y. Coadou 10 P. Delpierre 10 F. Djama 10 F. Etienne 10 L. Feligioni 10 F. Henry-Couannier 10 D. Hoffmann 10 F. Hubaut 10 E. B. F. G. Knoops 10 E. Le Guirriec 10 B. Li 10 J. Maurer 10 E. Monnier 10 J. Odier 10 E. Petit 10 P. Pralavorio 10 Z. Qian 10 A. Rozanov 10 M. Talby 10 N. Tannoury 10 S. Tisserant 10 J. Toth 10 F. Touchard 10 L. Vacavant 10
Abstract : The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets) in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV, using the ATLAS detector at the LHC. The measurements use data corresponding to an integrated luminosity of 34 pb^-1. The b-jets are identified using either a lifetime-based method, where secondary decay vertices of b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based method where the presence of a muon is used to identify semileptonic decays of b-hadrons inside jets. The inclusive b-jet cross-section is measured as a function of transverse momentum in the range 20 < pT < 400 GeV and rapidity in the range |y| < 2.1. The bbbar-dijet cross-section is measured as a function of the dijet invariant mass in the range 110 < m_jj < 760 GeV, the azimuthal angle difference between the two jets and the angular variable chi in two dijet mass regions. The results are compared with next-to-leading-order QCD predictions. Good agreement is observed between the measured cross-sections and the predictions obtained using POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured bbbar-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.
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Submitted on : Thursday, October 27, 2011 - 8:42:08 AM
Last modification on : Saturday, November 28, 2020 - 12:58:03 PM

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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1846. ⟨10.1140/epjc/s10052-011-1846-4⟩. ⟨in2p3-00636229⟩

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