Measurement of $W^{\pm }$-boson and $Z$-boson production cross-sections in $pp$ collisions at $\sqrt{s}=2.76$ TeV with the ATLAS detector

Abstract

The production cross-sections for $W^{\pm }$ and $Z$ bosons are measured using ATLAS data corresponding to an integrated luminosity of 4.0 pb${}^{-1}$ collected at a centre-of-mass energy $\sqrt{s}=2.76$ TeV. The decay channels $W\to \ell \nu$ and $Z\to \ell \ell$ are used, where $\ell$ can be an electron or a muon. The cross-sections are presented for a fiducial region defined by the detector acceptance and are also extrapolated to the full phase space for the total inclusive production cross-section. The combined (average) total inclusive cross-sections for the electron and muon channels are: \begin{eqnarray} σ^{\text{tot}}_{W^{+}\rightarrow \ell ν}& = & 2312 \pm 26\ (\text{stat.})\ \pm 27\ (\text{syst.}) \pm 72\ (\text{lumi.}) \pm 30\ (\text{extr.})\text{pb} \nonumber, \\ σ^{\text{tot}}_{W^{-}\rightarrow \ell ν}& = & 1399 \pm 21\ (\text{stat.})\ \pm 17\ (\text{syst.}) \pm 43\ (\text{lumi.}) \pm 21\ (\text{extr.})\text{pb} \nonumber, \\ σ^{\text{tot}}_{Z \rightarrow \ell \ell}& = & 323.4 \pm 9.8\ (\text{stat.}) \pm 5.0\ (\text{syst.}) \pm 10.0\ (\text{lumi.}) \pm 5.5 (\text{extr.}) \text{pb} \nonumber. \end{eqnarray} Measured ratios and asymmetries constructed using these cross-sections are also presented. These observables benefit from full or partial cancellation of many systematic uncertainties that are correlated between the different measurements.

43 pages in total, Author list starts at page 27, 7 figures, 9 tables, to be submitted to EPJ C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-06/

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• NNLO QCD predictions of the electron charge asymmetry for the inclusive $pp\to W+X$ production in the forward region at 13 TeV and 14 TeV
• Experimental QCD summary (ICHEP 2020)
• Linear scaling of lepton charge asymmetry in $W^{\pm }$ production in ultra-relativistic nuclear collisions