Abstract
The WZ boson pair production at 13 TeV is measured using the ATLAS detector. Leptonic decays of the W and Z bosons to electrons and muons are considered using 2015 and 2016 data that correspond to a total integrated luminosity of 13.3 fb −1 . The differential cross-section as a function of jet multiplicity is also measured along with the charge-dependent W + Z and W − Z cross-sections and their ratio. Also, the integrated fiducial cross-sections ratio, measured at center-of-mass energies of 8 TeV and 13 TeV, is calculated. Finally, limits on anomalous triple gauge couplings are derived.
Highlights
The diboson production provides an important test of perturbative quantum chromodynamics, especially that next-to-next-to-leading-order (NNLO) calculations [12] become available
The results presented in the following represent the first two measurements in the new energy regime of 13 TeV
The data analysed were collected by the ATLAS detector in LHC during 2015 and 2016 and correspond to a total integrated luminosity of 13.3 fb−1
Summary
The diboson production provides an important test of perturbative quantum chromodynamics (pQCD), especially that next-to-next-to-leading-order (NNLO) calculations [12] become available. Deviations from the predictions of the Standard Model (SM) on diboson production cross-section may be a strong indication of new physics and are an excellent probe of the electroweak sector of the SM. New physics could manifest itself as a modification of the triple and quartic gauge couplings (aTGC, aQGC respectively) and as an enhancement in the production cross-section. This article presents the √measurements of the W±Z production cross-section in pp collisions at a centre-of-mass energy of s=13 TeV. The differential cross-sections, as a function of the jet multiplicity, the Z-boson pT and the transverse mass of the W-boson are presented. Confidence intervals are derived for anomalous triple gauge couplings from the transverse mass spectrum of the W±Z system. The WZ experimental signature consists of three high-pT , isolated leptons accompanied by missing transverse energy, ETmiss. Decays of the bosons to electrons and muons are considered, leading to four distinct final-states: eee, eμμ, μee and μμμ
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