Updated constraints on $Z^{\prime }$ and $W^{\prime }$ bosons decaying into bosonic and leptonic final states using the Run 2 ATLAS data

Abstract

The full ATLAS Run 2 data set with time-integrated luminosity of 139 fb${}^{-1}$ in the diboson and dilepton channels is used to probe benchmark models with extended gauge sectors: the $E_6$-motivated Grand Unification models, the left-right symmetric $LR$ and the sequential standard model (EGM). These all predict neutral $Z^{\prime }$ vector bosons, decaying into lepton pairs, $\ell \ell$, or into electroweak gauge boson pairs $WW$, where one $W$ in turn decays semileptonically. 95% C.L. exclusion limits on the $Z^{\prime }$ resonance production cross section times branching ratio to electroweak gauge boson pairs and to lepton pairs in the mass range of $\sim$ 1 - 6 TeV are converted to constraints on the $Z$-$Z^{\prime }$ mixing parameter and the heavy resonance mass. We present exclusion regions on the parameter space of the $Z^{\prime }$ which are significantly extended compared to those obtained from the previous analyses performed with LHC data collected at 7 and 8 TeV in Run 1 as well as at 13 TeV in Run 2 at time-integrated luminosity of 36.1 fb${}^{-1}$ and are the most stringent bounds to date. Also presented, from a similar analysis of electrically charged $W^{\prime }$ bosons arising in the EGM, which can decay through $W^{\prime }\to WZ$ and $W^{\prime }\to \ell \nu$, are limits on the $W$-$W^{\prime }$ mixing parameter and the charged $W^{\prime }$ vector boson mass.

18 pages, many figures. arXiv admin note: substantial text overlap with arXiv:1912.02106, arXiv:1904.01432, arXiv:1809.08933. Version published in PRD

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