Abstract
An observation of electroweak W±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 s=13 TeV are used, corresponding to an integrated luminosity of 36.1fb−1. Events containing three identified leptons, either electrons or muons, and two jets are selected. The electroweak production of W±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 and for a single leptonic decay mode is measured to be σWZjj−EW=0.57−0.13+0.14(stat.)−0.06+0.07(syst.)fb. Total and differential fiducial cross-sections of the sum of W±Zjj electroweak and strong productions for several kinematic observables are also measured.
Highlights
IntroductionElectroweak V V j j production has only been observed in the same-sign W ± W ± j j √channel by CMS using data collected at a centre-of-mass energy of s = 13 TeV [6]
The scattering of vector bosons (VBS), V V → V V with V = W /Z /γ, is a key process with which to probe the SU(2)L × U(1)Y gauge symmetry of the electroweak (EW) theory that determines the self-couplings of the vector bosons
Interference effects between the W Z j j−QCD and W Z j j−EW processes are incorporated via the μW Z jj−EW parameter as a change of the global normalisation of the Sherpa electroweak prediction
Summary
Electroweak V V j j production has only been observed in the same-sign W ± W ± j j √channel by CMS using data collected at a centre-of-mass energy of s = 13 TeV [6]. Limits on electroweak cross-sections for the production of two gauge boson have been reported for the W ± Z j j [10,11], Z Z j j [12], Z γ j j [13] and W γ j j [14] channels by ATLAS and CMS. This Letter reports on an observation and measurement of electroweak W ± Z j j production, exploiting the fully leptonic final states where both the Z and W bosons decay into electrons or muons.
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