Abstract
A measurement of total and fiducial inclusive W and Z boson production cross sections in pp collisions at sqrt[s] = 8 TeV is presented. Electron and muon final states are analyzed in a data sample collected with the CMS detector corresponding to an integrated luminosity of 18.2 ± 0.5 pb(-1). The measured total inclusive cross sections times branching fractions are σ(pp → WX)×B(W → ℓν) = 12.21 ± 0.03(stat) ± 0.24(syst) ± 0.32(lum) nb and σ(pp → ZX) × B(Z → ℓ+ℓ-) = 1.15 ± 0.01(stat) ± 0.02(syst) ± 0.03(lum) nb for the dilepton mass in the range of 60-120 GeV. The measured values agree with next-to-next-to-leading-order QCD cross section calculations. Ratios of cross sections are reported with a precision of 2%. This is the first measurement of inclusive W and Z boson production in proton-proton collisions at sqrt[s] = 8 TeV.
Highlights
The production of W and Z bosons is one of the most prominent examples of hard scattering processes at hadron colliders [1]
Theoretical predictions are available at nextto-next-to-leading order (NNLO) [2,3,4,5,6] in perturbative quantum chromodynamics (QCD)
The calculations are limited by uncertainties in parton distribution functions (PDFs), missing higher-order QCD effects, and electroweak (EW) radiative corrections, which are available at next-to-leading order (NLO) [7,8,9,10]
Summary
The production of W and Z bosons is one of the most prominent examples of hard scattering processes at hadron colliders [1]. Precise measurements of inclusive cross sections provide tests of perturbative QCD and validate the theoretical predictions of higherorder corrections. Accurate measurements can be used to constrain PDFs. Inclusive W and Z boson production cross sections and their ratios were previously measured by the ATLAS and CMS Collaborations at the Laprgffiffie Hadron Collider (LHC) in proton-proton collisions at s 1⁄4 7 TeV [11,12,13].
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