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Measurement of the cross section for the production of a W boson in association with b-jets in pp collisions 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 L. Aperio Bella 7 B. Aubert 7 N. Berger 7 J. Colas 7 L. Di Ciaccio 7 T.K.O. Doan 7 S. Elles 7 P. Ghez 7 M. Gouanère 7 C. Goy 7 T. Guillemin 7 L. Helary 7 T. Hryn'Ova 7 G. Ionescu 7 A. Jérémie 7 S. Jézéquel 7 M. Kataoka 7 J. Labbe 7 R. Lafaye 7 J. Leveque 7 N. Massol 7 P. Perrodo 7 H. Przysiezniak 7 G. Sauvage 7 E. Sauvan 7 T. Todorov 7 D. Tsionou 7 I. Wingerter-Seez 7 R. Zitoun 7 Y. Zolnierowski 7 S. Albrand 8 M.L. Andrieux 8 B. Clément 8 J. Collot 8 S. Crépé-Renaudin 8 P.A. Delsart 8 J. Donini 8 J.Y. Hostachy 8 E. Laisne 8 F. Ledroit-Guillon 8 A. Lleres 8 A. Lucotte 8 F. Malek 8 P. Martin 8 F. Polci 8 J. Stark 8 X. Sun 8 B. Trocmé 8 C. Weydert 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 S. 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 the production of a W boson with one or two jets, of which at least one must be a b-jet, in pp collisions at sqrt(s)=7 TeV. Production via top decay is not included in the signal definition. The measurement is based on 35 pb^-1 of data collected with the ATLAS detector at the LHC. The W+b-jet cross section is defined for jets reconstructed with the anti-kt clustering algorithm with transverse momentum above 25 GeV and rapidity within +/-2.1. The b-jets are identified by reconstructing secondary vertices. The fiducial cross section is measured both for the electron and muon decay channel of the W boson and is found to be 10.2 +/- 1.9 (stat) +/- 2.6 (syst) pb for one lepton flavour. The results are compared with next-to-leading order QCD calculations, which predict a cross section smaller than, though consistent with, the measured value.
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Submitted on : Friday, September 9, 2011 - 3:50:32 PM
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G. Aad, T. Beau, S. Bordoni, G. Calderini, A. Camard, et al.. Measurement of the cross section for the production of a W boson in association with b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2012, 707, pp.418-437. ⟨10.1016/j.physletb.2011.12.046⟩. ⟨in2p3-00620629⟩

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