Measurement of the W±Z boson pair-production cross section in pp collisions at √s=13 TeV with the ATLAS Detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the W±Z boson pair-production cross section in pp collisions at √s=13 TeV with the ATLAS Detector. Physics letters. B, 762, pp. 1-22. Elsevier 10.1016/j.physletb.2016.08.052

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The production of W ± Z events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb⁻¹. The W ± Z candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons. The measured inclusive cross section in the detector fiducial region for leptonic decay modes is σ fid. W ± Z→ℓ′ νℓℓ =63.2±3.2 (stat.) ±2.6 (sys.) ±1.5 (lumi.) fb. In comparison, the next-to-leading-order Standard Model prediction is 53.4 +3.6 −2.8 fb. The extrapolation of the measurement from the fiducial to the total phase space yields σ tot. W ± Z =50.6±2.6 (stat.) ±2.0 (sys.) ±0.9 (th.) ±1.2 (lumi.) pb, in agreement with a recent next-to-next-to-leading-order calculation of 48.2 +1.1 −1.0 pb. The cross section as a function of jet multiplicity is also measured, together with the charge-dependent W⁺Z and W⁻Z cross sections and their ratio.

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