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


Aad G., Abbott B., Abdallah J., Abdelalim A. A. , Abdesselam A., Abdinov O., ...More

PHYSICS LETTERS B, vol.698, no.5, pp.325-345, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 698 Issue: 5
  • Publication Date: 2011
  • Doi Number: 10.1016/j.physletb.2011.03.012
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.325-345
  • Keywords: W-boson, Jets, ATLAS, LHC, Proton-proton, 7 TeV, PARTON DISTRIBUTIONS

Abstract

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 + >= n)/sigma(W + >= 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 <= 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. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.