Abstract
Measurements of fiducial integrated and differential cross sections for inclusive W^+, W^- and Z boson production are reported. They are based on 25.0 pm 0.5; mathrm {pb}^{-1} of pp collision data at sqrt{s} = 5.02 TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Electron and muon decay channels are analysed, and the combined W^+, W^- and Z integrated cross sections are found to be sigma _{W^+}= 2266 pm 9~text {(stat)} pm 29~text {(syst)} pm 43~text {(lumi)} pb, sigma _{W^-}= 1401 pm 7~text {(stat)} pm 18~text {(syst)} pm 27~text {(lumi)} pb, and sigma _Z= 374.5 pm 3.4~text {(stat)} pm 3.6~text {(syst)} pm 7.0~text {(lumi)} pb, in good agreement with next-to-next-to-leading-order QCD cross-section calculations. These measurements serve as references for Pb+Pb interactions at the LHC at sqrt{s_{mathrm {NN}}}=5.02 TeV.
Highlights
Measurements of W ± and Z boson1 production at hadron colliders provide a benchmark for the understanding of quantum chromodynamics (QCD) and electroweak (EW) processes
The rapidity distribution of EW boson production is sensitive to the underlying QCD dynamics and, in particular, to the parton distribution functions (PDFs) which define the initial kinematics of the hard process
Fiducial cross sections are reported for inclusive W +, W − and Z boson√production in pp collisions at the centre-ofmass energy s = 5.02 TeV
Summary
Measurements of W ± and Z boson production at hadron colliders provide a benchmark for the understanding of quantum chromodynamics (QCD) and electroweak (EW) processes. The ATLAS, CMS and LHCb collaborations have measured W ± and Z boson production in p√roton–proton ( pp) collisions at centre-of-mass energies of s = 7, 8 and 13 TeV [4,5,6,7] These measurements provide precision tests of the QCD theory and PDFs, which can be complemented. The peak instantaneous luminosity delivered by the LHC was L = 3.8 × 1032 cm−2 s−1 and the mean number of pp interactions per bunch crossing (hard scattering and pile-up events) was 1.5 This dataset is characterised by a relatively low pile-up contribution as compared to the measurements of weak-boson production performed at higher centre-of-mass energies by ATLAS. Published results from the ATLAS and CMS collaborations p1ar1reo]dciunucrPrtiebon+ntPl[y1b2acv,o1al3ill]iasibinolenthsfeoarpt +W√P±sbNsaNynsd=teZm2.ba7ot6√soTsneNVpNrao=nddu5c.Zt0i2obnToes[o8Vn–
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