Measurement of the production cross section for W-bosons in association with jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

G. Aad , B. Aubert (1) , M. Aurousseau (1) , N. Berger (1) , J. Colas (1) , L. Di Ciaccio (1) , M. El Kacimi (1) , S. Elles (1) , P. Ghez (1) , M. Gouanère (1) , C. Goy (1) , T. Guillemin (1) , L. Helary (1) , T. Hryn'Ova (1) , P. Iengo (1) , G. Ionescu (1) , A. Jérémie (1) , S. Jézéquel (1) , J. Labbe (1) , R. Lafaye (1) , N. Massol (1) , P. Perrodo (1) , H. Przysiezniak (1) , G. Sauvage (1) , T. Todorov (1) , I. Wingerter-Seez (1) , R. Zitoun (1) , Y. Zolnierowski (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , H. Bachacou (3) , F. Bauer (3) , N. Besson (3) , M. Boonekamp (3) , L. Chevalier (3) , F. Chevallier (3) , J. Ernwein (3) , A.I. Etienvre (3) , A. Formica (3) , L. Gauthier (3) , 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. Lenzi (3) , B. Mansoulie (3) , J.-P. Meyer (3) , N. Morange (3) , R. Nicolaidou (3) , A. Ouraou (3) , D.M. Pomarede (3) , B. Resende (3) , C.R. Royon (3) , Ph. Schune (3) , J. Schwindling (3) , M. Virchaux (3) , S. Albrand (4) , M.L. Andrieux (4) , B. Clement (4) , J. Collot (4) , S. Crépé-Renaudin (4) , P. de Saintignon (4) , P.A. Delsart (4) , J. Donini (4) , Daniel Dzahini (4) , J.Y. Hostachy (4) , E. Laisne (4) , F. Ledroit-Guillon (4) , A. Lleres (4) , A. Lucotte (4) , F. Malek (4) , P. Martin (4) , F. Polci (4) , J. Stark (4) , X. Sun (4) , B. Trocmé (4) , S. Aoun (5) , C. Bee (5) , C. Benchouk (5) , K. Bernardet (5) , N. Bousson (5) , C. Cerna (5) , J. C. Clémens (5) , Y. Coadou (5) , S. Corréard (5) , P. Delpierre (5) , F. Etienne (5) , L. Feligioni (5) , F. Henry-Couannier (5) , D. Hoffmann (5) , F. Hubaut (5) , M. Kuna (5) , E. Le Guirriec (5) , Jérémy Lévêque (5) , B. Li (5) , E. Monnier (5) , J. Odier (5) , E. Petit (5) , P. Pralavorio (5) , Z. Qian (5) , A. Rozanov (5) , M. Talby (5) , N. Tannoury (5) , V. Tisserant (5) , J. Toth (5) , F. Touchard (5) , L. Vacavant (5) , T. Beau (6) , S. Bordoni (6) , G. Calderini (6) , A. Camard (6) , P. Cavalleri (6) , E. Chareyre (6) , S. de Cecco (6) , F. Derue (6) , D. Imbault (6) , M.W. Krasny (6) , D. Lacour (6) , B. Laforge (6) , O. Le Dortz (6) , J. Lellouch (6) , G. Marchiori (6) , I. Nikolic-Audit (6) , J. Ocariz (6) , M. Ridel (6) , L. Roos (6) , Ph. Schwemling (6) , Timothée Theveneaux-Pelzer (6) , S. Trincaz-Duvoid (6) , T.N. Trinh (6) , F. Vannucci (7) , Emmanuel Busato (8) , D. Calvet (8) , S. Calvet (8) , Diane Cinca (8) , R. Febbraro (8) , P.L.Y. Gris (8) , N. Ghodbane (8) , C. Guicheney (8) , D. Pallin (8) , F. Podlyski (8) , C. Santoni (8) , L. P. Says (8) , F. Vazeille (8) , S. Viret (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 LAPP - Laboratoire d'Annecy de Physique des Particules
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
5 CPPM - Centre de Physique des Particules de Marseille
6 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
7 APC - Neutrinos
8 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
9 LAL - Laboratoire de l'Accélérateur Linéaire
10 IPHC - Institut Pluridisciplinaire Hubert Curien
11 IHEP - Institute of High Energy Physics

This Letter reports on a first measurement of the inclusive W+jets cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections sigma(W+ \ge n) / sigma(W+ \ge n-1) for inclusive jet multiplicities n=1-4. The results, based on an integrated luminosity of 1.3 pb-1, have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n \le 2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicities.

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

G. Aad, B. Aubert, M. Aurousseau, N. Berger, J. Colas, et al.. Measurement of the production cross section for W-bosons in association with jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Physics Letters B, 2011, 698, pp.325-345. ⟨10.1016/j.physletb.2011.03.012⟩. ⟨in2p3-00554921⟩