CMS-EWK-10-005

CMS-EWK-10-005 ; CERN-PH-EP-2011-107
Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at $\sqrt{s}$ = 7 TeV with the CMS experiment
CMS Collaboration
26 July 2011
J. High Energy Phys. 10 (2011) 132
Abstract: 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 inverse picobarns. The measured inclusive cross sections are $\sigma( \mathrm{ pp \to WX } ) \mathcal{B}( \mathrm{ W \to \ell \nu } ) =$ 10.30 $\pm$ 0.02 (stat.) $\pm$ 0.10 (syst.) $\pm$ 0.10 (th.) $\pm$ 0.41 (lumi.) nb and $\sigma( \mathrm{ pp \to ZX } ) \mathcal{B}( \mathrm{ Z \to \ell^+\ell^- } ) =$ 0.974 $\pm$ 0.007 (stat.) $\pm$ 0.007 (syst.) $\pm$ 0.018 (th.) $\pm$ 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are $[\sigma(\mathrm{ pp \to WX } ) \mathcal{B}(\mathrm{ W\to \ell \nu) } ]/[\sigma( \mathrm{ pp\to ZX } ) \mathcal{B}( \mathrm{ Z\to\ell^+\ell^- } )]$ = 10.54 $\pm$ 0.07 (stat.) $\pm$ 0.08 (syst.) $\pm$ 0.16 (th.) and $[\sigma( \mathrm{ pp \to W^+X } ) \mathcal{B}(\mathrm{ W^+ \to \ell^+\nu })] / [\sigma( \mathrm{ pp \to W^- X } ) \mathcal{B}(\mathrm{ W^- \to \ell^- \nu })] =$ 1.421 $\pm$ 0.006 (stat.) $\pm$ 0.014 (syst.) $\pm$ 0.029 (th.). \to The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.
Links: e-print arXiv:1107.4789 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; HepData record ; CADI line (restricted) ;

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