Abstract

The ATLAS experiment at the CERN Large Hadron Collider has performed searches for new, heavy bosons decaying to $WW$, $WZ$ and $ZZ$ final states in multiple decay channels using 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 8$ TeV. In the current study, the results of these searches are combined to provide a more stringent test of models predicting heavy resonances with couplings to vector bosons. Direct searches for a charged diboson resonance decaying to WZ in the $\ell\nu\ell'\ell'$ ($\ell = \mu, e$) , $\ell\ell q \bar{q}$, $\ell \nu q \bar{q}$ and fully hadronic final states are combined and upper limits on the rate of production times branching ratio to the $WZ$ bosons are compared with predictions of an extended gauge model with a heavy $W'$ boson. In addition, direct searches for a neutral diboson resonance decaying to $WW$ and $ZZ$ in the $\ell \ell q \bar{q}$, $\ell \nu q \bar{q}$, and fully hadronic final states are combined and upper limits on the rate of production times branching ratio to the $WW$ and $ZZ$ bosons are compared with predictions for a heavy, spin-2 graviton in an extended Randall--Sundrum model where the Standard Model fields are allowed to propagate in the bulk of the extra dimension.

Highlights

  • The naturalness argument associated with the small mass of the recently discovered Higgs boson [1,2,3,4] suggests that the Standard Model (SM) is conceivably to be extended by a theory that includes additional particles and interactions at the TeV scale

  • The results presented in this article use the√dataset collected in 2012 by ATLAS from the LHC pp collisions at s = 8 TeV, using a single-lepton trigger [33] with a pT threshold of 24 GeV, or a single large-radius jet trigger with a pT threshold of 360 GeV

  • For the full combination the largest deviation from the background-only expectation is found in the extended gauge model (EGM) W search at around 2.0 TeV with a p0-value corresponding to 2.5 standard deviations (σ )

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Summary

Introduction

The naturalness argument associated with the small mass of the recently discovered Higgs boson [1,2,3,4] suggests that the Standard Model (SM) is conceivably to be extended by a theory that includes additional particles and interactions at the TeV scale. Many such extensions of the SM, such as extended gauge models [5,6,7], models of warped extra dimensions [8,9,10], technicolour [11,12,13,14], and more generic composite Higgs models [15,16], predict the existence of massive resonances decaying to pairs of W and Z bosons. The leptonically decaying W → ν must have pT( ν) > 400 GeV, where pT( ν) is reconstructed from the sum of the charged-lepton momentum vector and vector

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