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Fiducial and differential cross-section measurements of electroweak W γ j j production in pp collisions at √s = 13 TeV with the ATLAS detector
Journal article   Open access

Fiducial and differential cross-section measurements of electroweak W γ j j production in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration, Diksha Garg and Usha Mallik
European Physical Journal C, Vol.84, 1064
2024
DOI: 10.1140/epjc/s10052-024-13311-6
url
https://doi.org/10.1140/epjc/s10052-024-13311-6View
Published (Version of record) Open Access

Abstract

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 √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 γ j j process from irreducible background processes. The observed significance of the electroweak W γ j j 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.
 acceptance background CERN LHC Coll channel cross section: measured coupling: (4gauge boson) data analysis method differential cross section: measured effective field theory electron electroweak interaction experimental results gauge boson: coupling GeV-cms higher-order: 0 jet: associated production muon new physics: search for one-photon p p: colliding beams p p: scattering perturbation theory: higher-order phase space photon: associated production symmetry breaking: gauge transverse momentum: missing-energy vector boson: scattering W: associated production W: leptonic decay

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