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Measurement of the W → ℓν and Z/γ* → ℓℓ production cross sections in proton-proton collisions at √ s = 7 TeV with the ATLAS detector
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Measurement of the W → ℓν and Z/γ* → ℓℓ production cross sections in proton-proton collisions at √ s = 7 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, M. Abolins, H. Abramowicz, H. Abreu, …
Journal of High Energy Physics, Vol.2010(12), 060
2010

Abstract

Hadron-Hadron scattering
First measurements of the W → ℓν and Z/γ <sup>*</sup> → ℓℓ (ℓ = e, μ) production cross sections in proton-proton collisions at √ s = 7TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W → ℓν and 179 Z/γ <sup>*</sup> → ℓℓ candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb <sup>-1</sup> . The measured total W and Z/ γ <sup>*</sup> -boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are σ <sup>tot</sup> <sub>W</sub> · BR(W → ℓν) = 9.96 ± 0.23(stat) ± 0.50(syst) ± 1.10(lumi) nb and σ <sup>tot</sup> <sub>Z/γ*</sub> · BR(Z/ γ <sup>*</sup> → ℓℓ) = 0.82 ± 0.06 (stat) ± 0.05 (syst) ± 0.09 (lumi) nb (within the invariant mass window 66 < m <sub>ℓℓ</sub> < 116 GeV). The W/Z cross-section ratio is measured to be 11.7 ± 0.9(stat) ± 0.4(syst). In addition, measurements of the W <sup>+</sup> and W <sup>-</sup> 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.
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https://doi.org/10.1007/JHEP12(2010)060View
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