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Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s} = 7$ TeV

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J H E P06(2012)058 Published for SISSA by Springer Received: April 7, 2012 Accepted: May 25, 2012 Published: June 11, 2012 Inclusive W and Z production in the forward region at √ s = 7TeV The LHCb collaboration Abstract: Measurements of inclusive W and Z boson production cross-sections in pp collisions at √ s = 7 TeV using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb−1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2.0 and 4.5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c2. The cross-sections are measured to be 831±9±27±29 pb for W+, 656±8±19±23 for W− and 76.7±1.7±3.3±2.7 pb for Z, where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be σW+→µ+ν/σW−→µ−ν¯ = 1.27±0.02±0.01 and (σW+→µ+ν+σW−→µ−ν¯)/σZ→µµ = 19.4±0.5± 0.9. The results are in general agreement with theoretical predictions, performed at next- to-next-to-leading order in QCD using recently calculated parton distribution functions. Keywords: Hadron-Hadron Scattering ArXiv ePrint: 1204.1620 Open Access, Copyright CERN, for the benefit of the LHCb collaboration doi:10.1007/JHEP06(2012)058 J H E P06(2012)058 Contents 1 Introduction 1 2 LHCb detector and Monte Carlo samples 3 3 Selection of W and Z events 4 3.1 Muon reconstruction and identification 4 3.2 Selection of Z → µµ candidates 4 3.3 Z → µµ event yield 4 3.4 Selection of W → µν candidates 6 3.5 W → µν event yield 9 4 Cross-section measurement 10 4.1 Cross-section definition 10 4.2 Signal efficiencies 10 4.3 Acceptance 13 4.4 Luminosity 13 4.5 Corrections to the data 1

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