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=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.
Original language | English |
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Article number | 646 |
Pages (from-to) | 1-30 |
Number of pages | 30 |
Journal | European Physical Journal C: Particles and Fields |
Volume | 77 |
Early online date | 25 Sept 2017 |
DOIs | |
Publication status | Published - Sept 2017 |