Study of WWγ and WZγ production in pp collisions at s√=8TeV and search for anomalous quartic gauge couplings with the ATLAS experiment

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Authors

Colleges, School and Institutes

External organisations

  • Université Mohamed Premier and LPTPM

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 s√=8TeV 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.

Bibliographic note

44 pages in total, author list starting page 28, 6 figures, 7 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2016-05/

Details

Original languageEnglish
Article number646
JournalEuropean Physical Journal C
Volume77
Publication statusPublished - 25 Sep 2017

Keywords

  • hep-ex