Observation of electroweak $W^{\pm }Z$ boson pair production in association with two jets in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

Abstract

An observation of electroweak $W^{\pm }Z$ production in association with two jets in proton-proton collisions is presented. The data collected by the ATLAS detector at the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s}=$ 13 TeV are used, corresponding to an integrated luminosity of 36.1 fb${}^{-1}$. Events containing three identified leptons, either electrons or muons, and two jets are selected. The electroweak production of $W^{\pm }Z$ bosons in association with two jets is measured with an observed significance of 5.3 standard deviations. A fiducial cross-section for electroweak production including interference effects is measured to be ${\sigma }_{WZjj-\mathrm{EW}}=0.57{}_{-0.13}^{+0.14}(stat.){}_{-0.06}^{+0.07}(syst.)\mathrm{fb}$. Total and differential fiducial cross-sections of the sum of $W^{\pm }Zjj$ electroweak and strong productions for several kinematic observables are also measured.

42 pages in total, author list starting page 26, 5 figures, 3 tables, Phys. Lett. B 793 (2019) 469, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-23/

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