Measurement of the production cross section for W-bosons in association with jets in p collisions at √s = 7 TeV with the ATLAS
Physics Letters B
Faculty of Science (FNWI)
Institute for High Energy Physics (IHEF)
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 σ(W+≥n)/σ(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.
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