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| Paper IPM / Particles / 12068 |
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A measurement of inclusive W and Z production cross sections in pp collisions at sqrt(s) = 7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 pb-1. The measured inclusive cross sections are s(pp - WX) * B(W - ln) = 10.30 +- 0.02 (stat.) +-0.10 (syst.) +-0.10 (th.) +-0.41 (lumi.)nb and s(pp - ZX) * B(Z - l+l-) = 0.974+- 0.007 (stat.) +-0.007 (syst.) +-0.018 (th.) 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are (s(pp - WX)*B(W - ln)) / (s(pp - ZX)*B(Z - l+l)) = 10.54 +-0.07 (stat.) +-0.08 (syst.) +-0.16 (th.) and (s(pp - W+X)* B(W+ - l+n)) /(s(pp - W X)* B(W - ln)) = 1.421 +- 0.006 (stat.) +-0.014 (syst.) 0.029 (th.).The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions
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