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Measurement of W+W− production in association with one jet in proton–proton collisions at √s = 8 TeV with the ATLAS detector

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • The ATLAS collaboration
<mark>Journal publication date</mark>10/12/2016
<mark>Journal</mark>Physics Letters B
Number of pages20
Pages (from-to)114-133
Publication StatusPublished
<mark>Original language</mark>English


The production of W boson pairs in association with one jet in pp collisions at √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 |η| < 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 σ fid,1-jet W W = 136 ± 6 (stat) ± 14 (syst) ± 3 (lumi) fb. In combination with a previous measurement restricted to leptonic final states with no associated jets, the fiducial cross section of W W production with zero or one jet is measured to be σ fid,≤1-jet W W = 511 ± 9 (stat) ± 26 (syst) ± 10 (lumi) fb. The ratio of fiducial cross sections in final states with one and zero jets is determined to be 0.36 ± 0.05. Finally, a total cross section extrapolated from the fiducial measurement of W W production with zero or one associated jet is reported. The measurements are compared to theoretical predictions and found in good agreement.