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 $Z'$ 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 $Z'$ 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 $Z$-$Z'$ mixing parameter and the heavy resonance mass. We present exclusion regions on the parameter space of the $Z'$ 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 $W'$ bosons arising in the EGM, which can decay through $W'\to WZ$ and $W'\to \ell\nu$, are limits on the $W$-$W'$ mixing parameter and the charged $W'$ vector boson mass.
Highlights
One of the main goals of the physics program at the Large Hadron Collider (LHC) is to search for new resonant or nonresonant phenomena that become visible in highenergy proton-proton collisions
Previous analyses of the Z-Z0 and W-W0 mixing [36,37,38] were carried out using the diboson and dilepton production datasets corresponding to the time-integrated luminosity of ∼36 fb−1 collected in 20p1ffi5ffi and 2016 with the ATLAS and CMS Collaborations at s 1⁄4 13 TeV where, in the former case, electroweak Z and W gauge bosons decay into the semileptonic channel [39] or into the dijet final state [40]
We present an analysis of bounds on Z-Z0 mixing from constraints on diboson and dilepton production in the context of the benchmark models with an extended gauge sector, employing the most recent searches recorded by the ATLAS (139 fb−1) detector in the semileptonic [43,44] and fully hadronic [41,42] final states at the LHC
Summary
One of the main goals of the physics program at the Large Hadron Collider (LHC) is to search for new resonant or nonresonant phenomena that become visible in highenergy proton-proton collisions. Previous analyses of the Z-Z0 and W-W0 mixing [36,37,38] were carried out using the diboson and dilepton production datasets corresponding to the time-integrated luminosity of ∼36 fb−1 collected in 20p1ffi5ffi and 2016 with the ATLAS and CMS Collaborations at s 1⁄4 13 TeV where, in the former case, electroweak Z and W gauge bosons decay into the semileptonic channel [39] or into the dijet final state [40]. We present an analysis of bounds on Z-Z0 mixing from constraints on diboson and dilepton production in the context of the benchmark models with an extended gauge sector, employing the most recent searches recorded by the ATLAS (139 fb−1) detector in the semileptonic [43,44] and fully hadronic (referred to as qqqq) [41,42] final states at the LHC.
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