Measurement of $W^{+}{W}^{-}$ production in association with one jet in proton--proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

The production of $W$ boson pairs in association with one jet in $pp$ collisions at $\sqrt{s}=8$ TeV is studied using data corresponding to an integrated luminosity of 20.3 fb${}^{-1}$ collected by the ATLAS detector during 2012 at the CERN Large Hadron Collider. The cross section is measured in a fiducial phase-space region defined by the presence of exactly one electron and one muon, missing transverse momentum and exactly one jet with a transverse momentum above 25 GeV and a pseudorapidity of $|\eta |<4.5$. The leptons are required to have opposite electric charge and to pass transverse momentum and pseudorapidity requirements. The fiducial cross section is found to be ${\sigma }_{WW}^{\mathrm{fid},1\text{-}\mathrm{jet}}=136\pm 6($stat$)\pm 14($syst$)\pm 3($lumi$)$ fb. In combination with a previous measurement restricted to leptonic final states with no associated jets, the fiducial cross section of $WW$ production with zero or one jet is measured to be ${\sigma }_{WW}^{\mathrm{fid},\le 1\text{-}\mathrm{jet}}=511\pm 9($stat$)\pm 26($syst$)\pm 10($lumi$)$ fb. The ratio of fiducial cross sections in final states with one and zero jets is determined to be $0.36\pm 0.05$. Finally, a total cross section extrapolated from the fiducial measurement of $WW$ production with zero or one associated jet is reported. The measurements are compared to theoretical predictions and found in good agreement.

17 pages plus author list (34 pages total), 2 figures, 2 tables, final version published in PLB, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2015-24/

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• Les Houches 2021: Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
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• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
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