Study of WWγ and WZγ production in pp collisions at s=8TeV and search for anomalous quartic gauge couplings with the ATLAS experiment
M. Aaboud (Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco); G. Aad (CPPM, Aix-Marseille Université and CNRS/IN2P3, 0000 0004 0452 0652, Marseille, France); B. Abbott (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 0000 0004 0447 0018, Norman, OK, USA); O. Abdinov (Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan); B. Abeloos (LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 0000 0001 0278 4900, Orsay, France); et al - Show all 2877 authors
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.