Search for New Phenomena in a Lepton Plus High Jet Multiplicity Final State with the ATLAS Experiment Using √s̅ = 13 TeV Proton-Proton Collision Data

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Abstract

This paper presents a study of WWγ and WZγ triboson production using events from proton-proton collisions at a centre-of-mass energy of √s̅ = 8 TeV recorded with the ATLAS detector at the LHC and corresponding to an integrated luminosity of 20.2 fb⁻¹. The WWγ production cross-section is determined using a final state containing an electron, a muon, a photon, and neutrinos (eνμνγ). Upper limits on the production cross-section of the eνμνγ final state and the WWγ and WZγ final states containing an electron or a muon, two jets, a photon, and a neutrino (eνjjγ or μνjjγ) are also derived. The results are compared to the cross-sections predicted by the Standard Model at next-to-leading order in the strong-coupling constant. In addition, upper limits on the production cross-sections are derived in a fiducial region optimised for a search for new physics beyond the Standard Model. The results are interpreted in the context of anomalous quartic gauge couplings using an effective field theory. Confidence intervals at 95% confidence level are derived for the 14 coupling coefficients to which WWγ and WZγ production are sensitive.

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Keywords

, , Z bosons, Proton-proton interactions, W bosons, Photons, Electrons, Jets (Nuclear physics), Muons, Standard model (Nuclear physics)

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Rights

CC BY 4.0 (Attribution), ©2017 CERN, for the ATLAS Collaboration

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