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W and Z Boson Cross Section and W Asymmetry at CMS

Abstract

We report the measurement of the rates and asymmetries of inclusive and differential production of W and Z vector bosons in pp collision at s\sqrt{s}=7 TeV. The data consists of 36 pb1pb^{-1} collected in the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). The measured inclusive cross sections are σ(ppWX)×B(Wν)=10.31±0.02(stat.)±0.09(syst.)±0.10(th.)±0.41(lumi.)\sigma(pp\to WX)\times B(W\to \ell\nu) = 10.31 \pm 0.02 (stat.) \pm 0.09 (syst.) \pm 0.10 (th.) \pm 0.41 (lumi.) nb and σ(ppZX)×B(Z)=0.975±0.007(stat.)±0.007(syst.)±0.018(th.)±0.039(lumi.)\sigma(pp\to ZX)\times B(Z\to \ell\ell) = 0.975 \pm 0.007 (stat.) \pm 0.007 (syst.) \pm 0.018 (th.) \pm 0.039 (lumi.) nb. The measured inclusive cross sections and also its ratio of W to Z or W+W^{+} to WW^{-} agree with NNLO QCD cross section calculations and current parton distribution functions (PDFs). The differential production asymmetry of W boson as a function of the lepton pseudorapidity in the final state is also measured and compared with various PDFs.Comment: Proceedings of the DPF-2011 Conference, Providence, RI, August 8-13, 201

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