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Measurement of the cross-section for b-jets produced in association with a Z boson at sqrt(s)=7 TeV with the ATLAS detector

G. Aad T. Beau 1 S. Bordoni 1 G. Calderini 1 A. Camard 1 P. Cavalleri 1 E. Chareyre 1 S. de Cecco 1 F. Derue 1 D. Imbault 1 M.W. Krasny 1 D. Lacour 1 B. Laforge 1 O. Le Dortz 1 J. Lellouch 1 G. Marchiori 1 I. Nikolic-Audit 1 J. Ocariz 1 M. Ridel 1 L. Roos 1 Ph. Schwemling 1 Timothée Theveneaux-Pelzer 1 S. Trincaz-Duvoid 1 T.N. Trinh 1 F. Vannucci 2 H. Bachacou 3 F. Bauer 3 N. Besson 3 N.M. Bolnet 3 M. Boonekamp 3 L. Chevalier 3 J. Ernwein 3 A.I. Etienvre 3 A. Formica 3 L. Gauthier 3 P.F. Giraud 3 C. Guyot 3 S. Hassani 3 W. Kozanecki 3 E. Lancon 3 J.F. Laporte 3 E. Le Menedeu 3 M. Legendre 3 B. Mansoulie 3 J.-P. Meyer 3 N. Morange 3 E. Mountricha 3 R. Nicolaidou 3 A. Ouraou 3 D.M. Pomarede 3 B. Resende 3 C.R. Royon 3 Ph. Schune 3 J. Schwindling 3 O. Simard 3 M. Virchaux 3 C. Biscarat 4 E. Cogneras 4 G. Rahal 4 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 Reina Coromoto Camacho Toro 5 Diane Cinca 6 R. Febbraro 5 N. Ghodbane 5 C. Guicheney 5 H. Liao 5 D. Pallin 5 F. Podlyski 5 C. Santoni 5 L. P. Says 5 F. Vazeille 5 S. Albrand 7 M.L. Andrieux 7 B. Clement 7 J. Collot 7 S. Crépé-Renaudin 7 P.A. Delsart 7 J. Donini 7 J.Y. Hostachy 7 E. Laisne 7 F. Ledroit-Guillon 7 A. Lleres 7 A. Lucotte 7 F. Malek 7 P. Martin 7 F. Polci 7 J. Stark 7 X. Sun 7 B. Trocmé 7 C. Weydert 7 L. Aperio Bella 8 B. Aubert 8 N. Berger 8 J. Colas 8 L. Di Ciaccio 8 T.K.O. Doan 8 S. Elles 8 P. Ghez 8 M. Gouanère 8 C. Goy 8 T. Guillemin 8 L. Helary 8 T. Hryn'Ova 8 G. Ionescu 8 A. Jérémie 8 S. Jézéquel 8 M. Kataoka 8 J. Labbe 8 R. Lafaye 8 J. Leveque 8 N. Massol 8 P. Perrodo 8 H. Przysiezniak 8 G. Sauvage 8 E. Sauvan 8 T. Todorov 8 D. Tsionou 8 I. Wingerter-Seez 8 R. Zitoun 8 Y. Zolnierowski 8 S. Aoun 9 C. P. Bee 9 C. Benchouk 9 K. Bernardet 9 N. Bousson 9 J. C. Clémens 9 Y. Coadou 9 P. Delpierre 9 F. Djama 9 F. Etienne 9 L. Feligioni 9 F. Henry-Couannier 9 D. Hoffmann 9 F. Hubaut 9 E.B. F. G. Knoops 9 E. Le Guirriec 9 B. Li 9 E. Monnier 9 J. Odier 9 E. Petit 9 P. Pralavorio 9 Z. Qian 9 A. Rozanov 9 M. Talby 9 N. Tannoury 9 S. Tisserant 9 J. Toth 9 F. Touchard 9 L. Vacavant 9 H. Abreu 10 N. Andari 10 C. Arnault 10 E. Augé 10 P. Barrillon 10 M. Benoit 10 S. Binet 10 J.-B. Blanchard 10 C. Bourdarios 10 D. Breton 10 C. Collard 11 C. de la Taille 10 J.B. de Vivie de Regie 10 Sara Diglio 10 L. Duflot 10 M. Escalier 10 A.C. Falou 10 L. Fayard 10 D. Fournier 10 J.-F. Grivaz 10 M. Heller 10 S. Henrot-Versillé 10 J. Hrivnac 10 L. Iconomidou-Fayard 10 J. Idarraga 10 M. Kado 10 A. Lounis 10 N. Makovec 10 P. Matricon 10 F. Niedercorn 10 L. Poggioli 10 P. Puzo 10 A. Renaud 10 D. Rousseau 10 X. Ruan 10, 12 G. Rybkin 10 J.B. Sauvan 10 J. Schaarschmidt 10 A.C. Schaffer 10 L. Serin 10 S. Simion 10 R. Tanaka 10 J.J. Veillet 10 I. Vukotic 10 F. Wicek 10 D. Zerwas 10 Zhiqing Zhang 10
Abstract : A measurement is presented of the cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of sqrt(s)=7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb^-1. The event selection requires a Z boson decaying into high pt electrons or muons, and a b-jet, identified by its displaced vertex, with transverse momentum pt>25 GeV and rapidity |y|<2.1. After subtraction of backgrounds, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order.
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Submitted on : Thursday, September 8, 2011 - 3:50:14 PM
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G. Aad, T. Beau, S. Bordoni, G. Calderini, A. Camard, et al.. Measurement of the cross-section for b-jets produced in association with a Z boson at sqrt(s)=7 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2012, 706, pp.295-313. ⟨10.1016/j.physletb.2011.11.059⟩. ⟨in2p3-00620626⟩

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