Measurements of inclusive W ; Z boson production cross-sections in pp collisions at √ s = 7TeV 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 ; Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c ; pseudorapidity between 2:0 ; 4:5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 ; 120 GeV/c 2. The cross-sections are measured to be 831±9±27±29 pb for W +, 656±8±19±23 for W - ; 76:7±1:7±3: 3±2:7 pb for Z, where the first uncertainty is statistical, the second is systematic ; the third is due to the luminosity. Differential cross-sections, W ; Z cross-section ratios ; 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 ; ( 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 nextto- next-to-leading order in QCD using recently calculated parton distribution functions. Copyright CERN.

Inclusive W ; Z production in the forward region at √ s = 7 TeV

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012-01-01

Abstract

Measurements of inclusive W ; Z boson production cross-sections in pp collisions at √ s = 7TeV 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 ; Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c ; pseudorapidity between 2:0 ; 4:5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 ; 120 GeV/c 2. The cross-sections are measured to be 831±9±27±29 pb for W +, 656±8±19±23 for W - ; 76:7±1:7±3: 3±2:7 pb for Z, where the first uncertainty is statistical, the second is systematic ; the third is due to the luminosity. Differential cross-sections, W ; Z cross-section ratios ; 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 ; ( 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 nextto- next-to-leading order in QCD using recently calculated parton distribution functions. Copyright CERN.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179791
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