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Measurement of the W → ℓν and Z / γ * → ℓℓ production cross sections in proton-proton collisions at with the ATLAS detector

Measurement of the W → ℓν and Z / γ * → ℓℓ production cross sections in proton-proton collisions at with the ATLAS detector,10.1007/JHEP12(2010)060,Jo

Measurement of the W → ℓν and Z / γ * → ℓℓ production cross sections in proton-proton collisions at with the ATLAS detector  
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G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, M. Abolins, H. Abramowicz, H. Abreu, E. Acerbi, B. S. Acharyahttp://academic.research.microsoft.com/io.ashx?type=5&id=47871266&selfId1=0&selfId2=0&maxNumber=12&query=
First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-proton collisions at are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W → ℓν and 179 Z/γ * → ℓℓ candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb. The measured total W and Z/γ ∗-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are . BR(W → ℓν) = 9.96 ± 0.23(stat) ± 0.50(syst) ± 1.10(lumi) nb and BR(Z/γ ∗ → ℓℓ) = 0.82 ± 0.06 (stat) ± 0.05 (syst) ± 0.09(lumi) nb (within the invariant mass window 66 m ℓℓ 116GeV). The W/Z cross-section ratio is measured to be 11.7 ± 0.9(stat) ± 0.4(syst). In addition, measurements of the W + and W − production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.
Journal: Journal of High Energy Physics - J HIGH ENERGY PHYS , vol. 2010, no. 12, pp. 1-65, 2010
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