Search for production of $WW/WZ$ resonances decaying to a lepton, neutrino and jets in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

TL;DR

This paper searches for narrow $WW$ or $WZ$ resonances in proton-proton collisions at 8 TeV using ATLAS data, setting exclusion limits on certain hypothetical particles but finding no evidence of such resonances.

Contribution

First search for $WW/WZ$ resonances in this specific decay channel at 8 TeV with ATLAS, providing new exclusion limits on Randall-Sundrum gravitons and $W'$ bosons.

Findings

No evidence for diboson resonances was observed.

Resonance masses below 700 GeV and 1490 GeV are excluded at 95% CL.

Constraints on models with spin-2 gravitons and extended gauge symmetries.

Abstract

A search is presented for narrow diboson resonances decaying to $WW$ or $WZ$ in the final state where one $W$ boson decays leptonically (to an electron or a muon plus a neutrino) and the other $W/Z$ boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC. No evidence for resonant diboson production is observed, and resonance masses below 700 GeV and 1490 GeV are excluded at 95% confidence level for the spin-2 Randall-Sundrum bulk graviton $G^*$ with coupling constant of 1.0 and the extended gauge model $W'$ boson respectively.