Measurement of the inclusive W and Z production cross sections in pp collisions at sqrt {s} = 7 TeV with the CMS experiment
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 pb-1. The measured inclusive cross sections are σ(pp → W X) × mathcal{B}left( {{text{W}} to ell ν } right) = 10.31 ± 0.02 (stat.) ± 0.09 (syst.) ± 0.10 (th.) ± 0.41 (lumi.) nb and σ(pp → Z X) × mathcal{B}left( {{text{Z}} to {ell+ }{ell- }} right) = 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 ( σ(pp → W X) × mathcal{B}left( {{text{W}} to ell ν } right) /( σ(pp → Z X) × mathcal{B}left( {{text{Z}} to {ell+ }{ell- }} right) = 10.54 ± 0.07 (stat.) ± 0.08 (syst.) ± 0.16 (th.) and ( σ(pp → W+ X) × mathcal{B}left( {{{text{W}}^{ + }} to {ell+ }ν } right) /( σ(pp → W- X) × mathcal{B}left( {{{text{W}}- } to {ell- }bar{ν }} right) = 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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- October 2011
- DOI:
- 10.1007/JHEP10(2011)132
- arXiv:
- arXiv:1107.4789
- Bibcode:
- 2011JHEP...10..132C
- Keywords:
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- Hadron-Hadron Scattering;
- High Energy Physics - Experiment
- E-Print:
- JHEP 10 (2011) 132