Search for resonant $WZ \rightarrow \ell\nu \ell^{\prime}\ell^{\prime}$ production in proton$-$proton collisions at $\mathbf{\sqrt{s} = 13}$ TeV with the ATLAS detector

TL;DR

This paper reports a search for $WZ$ resonances in fully leptonic final states using 139 fb$^{-1}$ of 13 TeV proton-proton collision data from ATLAS, setting limits on new physics models without observing excess.

Contribution

It provides the first search for $WZ$ resonances in leptonic channels at 13 TeV, interpreting results in terms of specific beyond Standard Model scenarios.

Findings

No significant excess observed over Standard Model predictions.

Limits set on production cross-section times branching ratio for various resonance masses.

Results constrain models like the Georgi-Machacek Higgs and Heavy Vector Triplet.

Abstract

A search for a $WZ$ resonance, in the fully leptonic final state (electrons and muons), is performed using 139 fb$^{-1}$ of data collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The results are interpreted in terms of a singly charged Higgs boson of the Georgi$-$Machacek model, produced by $WZ$ fusion, and of a Heavy Vector Triplet, with the resonance produced by $WZ$ fusion or the Drell$-$Yan process. No significant excess over the Standard Model predictions is observed and limits are set on the production cross-section times branching ratio as a function of the resonance mass for these processes.