Evidence for Electroweak Production of $W^{\pm }{W}^{\pm }jj$ in $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector

Abstract

This Letter presents the first study of $W^{\pm }{W}^{\pm }jj$, same-electric-charge diboson production in association with two jets, using 20.3 fb${}^{-1}$ of proton--proton collision data at $\sqrt{s}=8$ TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with two reconstructed same-charge leptons ($e^{\pm }{e}^{\pm }$, $e^{\pm }{\mu }^{\pm }$, and ${\mu }^{\pm }{\mu }^{\pm }$) and two or more jets are analyzed. Production cross sections are measured in two fiducial regions, with different sensitivities to the electroweak and strong production mechanisms. First evidence for $W^{\pm }{W}^{\pm }jj$ production and electroweak-only $W^{\pm }{W}^{\pm }jj$ production is observed with a significance of $4.5$ and $3.6$ standard deviations respectively. The measured production cross sections are in agreement with Standard Model predictions. Limits at 95% confidence level are set on anomalous quartic gauge couplings.

7 pages plus author list (20 pages total), 3 figures,2 tables, submitted to PRL, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-06/

References in corpus (13)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• PYTHIA 6.4 Physics and Manual
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• VBFNLO: A parton level Monte Carlo for processes with electroweak bosons
• Hard Interactions of Quarks and Gluons: a Primer for LHC Physics
• Next-to-leading order QCD predictions for W+W+jj production at the LHC
• Next-to-leading order QCD corrections to W+Z and W-Z production via vector-boson fusion
• Longitudinal WW scattering in light of the "Higgs" discovery
• Isolating Vector Boson Scattering at the LHC: gauge cancellations and the Equivalent Vector Boson Approximation vs complete calculations

Cited by in corpus (5)

• Study of vector boson scattering and search for new physics in events with two same-sign leptons and two jets
• Higgs constraints from vector boson fusion and scattering
• Measurement of the production and differential cross sections of $W^{+}{W}^{-}$ bosons in association with jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Overview of Triple and Quartic Gauge Coupling Measurements at the LHC
• Experimental Summary of the Second Annual Conference on Large Hadron Collider Physics