Abstract

A search for resonant diboson production using a data sample corresponding to 4.7 fb-1 of integrated luminosity collected by the ATLAS experiment at the Large Hadron Collider in pp collisions at 7 TeV is presented. The search for a narrow resonance in the WW or WZ mass distribution is conducted in a final state with an electron or a muon, missing transverse momentum and at least two jets. No significant excess is observed and limits are set using three benchmark models: WW resonance masses below 940 GeV and 710 GeV are excluded at 95% confidence level for spin-2 Randall-Sundrum and bulk Randall-Sundrum gravitons, respectively; WZ resonance masses below 950 GeV are excluded at 95% confidence level for a spin-1 Extended Gauge Model W' boson.

Highlights

  • Many extensions to the Standard Model (SM) predict new massive particles that can decay to WW, WZ, or ZZ final states [1,2,3]

  • This article describes a search for a narrow resonance decaying to either a WW or WZ diboson intermediate state with subsequent decays to an ‘jj final state, i.e. a charged lepton, large missing transverse momentum ðEmT issÞ, and at least two jets

  • Data corresponding to 4:7 fbÀ1 collected by the ATLAS experiment apt ffiffithe Large Hadron Collider (LHC) in pp collisions at s 1⁄4 7 TeV are used

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Summary

INTRODUCTION

Many extensions to the Standard Model (SM) predict new massive particles that can decay to WW, WZ, or ZZ final states [1,2,3]. The ‘jj final state allows the reconstruction of the invariant mass of the system, under certain assumptions for neutrino momentum from a W boson decay. In the nominal EGM, the coupling strength scaling factor cEGM is set to one This analysis derives exclusion limits for a range of values of this parameter as a function of the invariant mass of the ‘jj system. Similar searches, mentioned above, for a ZZ resonance by the ATLAS Collaboration exclude an RS1 graviton with mass below 845 GeV [10]. The CMS Collaboration reports a ZZ resonance search in the ‘‘jj final state and excludes an RS1 graviton with mass below 945 resonance aTteVpffis[ffi11⁄44].7PTreevVioubsy direct the searches ATLAS for and a WZ CMS. Collaborations exclude the EGM W0 benchmark with mass below 760 GeV [9] and 1143 GeV [15], respectively

THE ATLAS DETECTOR
MONTE CARLO SIMULATION
OBJECT RECONSTRUCTION AND EVENT SELECTION
BACKGROUND
SELECTION OF SIGNAL AND CONTROL REGIONS
SYSTEMATIC UNCERTAINTIES
VIII. RESULTS AND INTERPRETATION
Findings
TeV collected in 2011 by the ATLAS detector at the
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