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 (5) , 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 (6) , B. Aubert (6) , N. Berger (6) , J. Colas (6) , L. Di Ciaccio (6) , T.K.O. Doan (6) , S. Elles (6) , P. Ghez (6) , M. Gouanère (6) , C. Goy (6) , T. Guillemin (6) , L. Helary (6) , T. Hryn'Ova (6) , G. Ionescu (6) , A. Jérémie (6) , S. Jézéquel (6) , M. Kataoka (6) , J. Labbe (6) , R. Lafaye (6) , J. Leveque (6) , N. Massol (6) , P. Perrodo (6) , H. Przysiezniak (6) , G. Sauvage (6) , E. Sauvan (6) , T. Todorov (6) , D. Tsionou (6) , I. Wingerter-Seez (6) , R. Zitoun (6) , Y. Zolnierowski (6) , S. Albrand (7) , M.L. Andrieux (7) , B. Clément (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) , S. Aoun (8) , C. P. Bee (8) , C. Benchouk (8) , K. Bernardet (8) , N. Bousson (8) , J. C. Clémens (8) , Y. Coadou (8) , P. Delpierre (8) , F. Djama (8) , F. Etienne (8) , L. Feligioni (8) , F. Henry-Couannier (8) , D. Hoffmann (8) , F. Hubaut (8) , E. B. F. G. Knoops (8) , E. Le Guirriec (8) , B. Li (8) , E. Monnier (8) , J. Odier (8) , E. Petit (8) , P. Pralavorio (8) , Z. Qian (8) , A. Rozanov (8) , M. Talby (8) , N. Tannoury (8) , S. Tisserant (8) , J. Toth (8) , F. Touchard (8) , L. Vacavant (8) , H. Abreu (9) , N. Andari (9) , C. Arnault (9) , E. Augé (9) , P. Barrillon (9) , M. Benoit (9) , S. Binet (9) , J.-B. Blanchard (9) , C. Bourdarios (9) , D. Breton (9) , C. Collard (10) , C. de La Taille (9) , J.B. de Vivie de Regie (9) , Sara Diglio (9) , L. Duflot (9) , M. Escalier (9) , A.C. Falou (9) , L. Fayard (9) , D. Fournier (9) , J.-F. Grivaz (9) , M. Heller (9) , S. Henrot-Versillé (9) , J. Hrivnac (9) , L. Iconomidou-Fayard (9) , J. Idarraga (9) , M. Kado (9) , A. Lounis (9) , N. Makovec (9) , P. Matricon (9) , F. Niedercorn (9) , L. Poggioli (9) , P. Puzo (9) , A. Renaud (9) , D. Rousseau (9) , X. Ruan (9, 11) , G. Rybkin (9) , J.B. Sauvan (9) , J. Schaarschmidt (9) , A.C. Schaffer (9) , L. Serin (9) , S. Simion (9) , R. Tanaka (9) , J.J. Veillet (9) , I. Vukotic (9) , F. Wicek (9) , D. Zerwas (9) , Zhiqing Zhang (9)

1 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 APC - Neutrinos
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 CC-IN2P3 - Centre de Calcul de l'IN2P3
5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
6 LAPP - Laboratoire d'Annecy de Physique des Particules
7 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
8 CPPM - Centre de Physique des Particules de Marseille
9 LAL - Laboratoire de l'Accélérateur Linéaire
10 IPHC - Institut Pluridisciplinaire Hubert Curien
11 IHEP - Institute of High Energy Physics

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.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

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, 2012, 707, pp.418-437. ⟨10.1016/j.physletb.2011.12.046⟩. ⟨in2p3-00620629⟩