Fiducial and differential cross-section measurements of electroweak $$W\gamma jj$$ production in $pp$ collisions at $$\sqrt{s} = 13$$ TeV with the ATLAS detector
Journal Article
·
· European Physical Journal. C, Particles and Fields (Online)
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- Centre National de la Recherche Scientifique (CNRS), Marseille (France). Institut National de Physique Nucleaire et de Physique des Particules (IN2P3), Marseille (France). Centre de Physique des Particules de Marseille (CPPM); Aix-Marseille Université, Marseille (France); ATLAS Collaboration. et al.
The observation of the electroweak production of a W boson and a photon in association with two jets, using pp collision data at the Large Hadron Collider at a centre of mass energy of $$\sqrt{s} = 13$$ TeV, is reported. The data were recorded by the ATLAS experiment from 2015 to 2018 and correspond to an integrated luminosity of 140 fb-1. This process is sensitive to the quartic gauge boson couplings via the vector boson scattering mechanism and provides a stringent test of the electroweak sector of the Standard Model. Events are selected if they contain one electron or muon, missing transverse momentum, at least one photon, and two jets. Multivariate techniques are used to distinguish the electroweak $$W\gamma jj$$ process from irreducible background processes. The observed significance of the electroweak $$W\gamma jj$$ process is well above six standard deviations, compared to an expected significance of 6.3 standard deviations. Fiducial and differential cross sections are measured in a fiducial phase space close to the detector acceptance, which are in reasonable agreement with leading order Standard Model predictions from MADGRAPH5+PYTHIA8 and SHERPA. The results are used to constrain new physics effects in the context of an effective field theory.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2563371
- Journal Information:
- European Physical Journal. C, Particles and Fields (Online), Journal Name: European Physical Journal. C, Particles and Fields (Online) Journal Issue: 10 Vol. 84; ISSN 1434-6052
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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