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Measurement of electroweak $ Z\left(\nu \overline{\nu}\right)\gamma jj $ production and limits on anomalous quartic gauge couplings in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 6, 82
Publication date2023
First online date2023-06-14
Abstract

The electroweak production of $ Z\left(\nu \overline{\nu}\right)\gamma $ in association with two jets is studied in a regime with a photon of high transverse momentum above 150 GeV using proton–proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider. The analysis uses a data sample with an integrated luminosity of 139 fb$^{−1}$ collected by the ATLAS detector during the 2015–2018 LHC data-taking period. This process is an important probe of the electroweak symmetry breaking mechanism in the Standard Model and is sensitive to quartic gauge boson couplings via vector-boson scattering. The fiducial $ Z\left(\nu \overline{\nu}\right)\gamma jj $ cross section for electroweak production is measured to be $ {0.77}_{-0.30}^{+0.34} $ fb and is consistent with the Standard Model prediction. Evidence of electroweak $ Z\left(\nu \overline{\nu}\right)\gamma jj $ production is found with an observed significance of 3.2σ for the background-only hypothesis, compared with an expected significance of 3.7σ. The combination of this result with the previously published ATLAS observation of electroweak $ Z\left(\nu \overline{\nu}\right)\gamma jj $ production yields an observed (expected) signal significance of 6.3σ (6.6σ). Limits on anomalous quartic gauge boson couplings are obtained in the framework of effective field theory with dimension-8 operators.

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Keywords
  • Electroweak Interaction
  • Hadron-Hadron Scattering
  • P p: scattering
  • P p: colliding beams
  • Z0: hadroproduction
  • Z0: leptonic decay
  • Neutrino: pair production
  • Dijet: associated production
  • Jet: pair production
  • Coupling: gauge
  • Gauge boson: coupling
  • Coupling: (4gauge boson)
  • Vector boson: scattering
  • Electroweak interaction: symmetry breaking
  • Transverse momentum: high
  • Photon: transverse momentum
  • ATLAS
  • CERN LHC Coll
  • Photon: final state
  • Effective field theory
  • Operator: higher-dimensional
  • Dimension: 8
  • Channel cross section: measured
  • Coupling: anomaly
  • Coupling constant: upper limit
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of electroweak $ Z\left(\nu \overline{\nu}\right)\gamma jj $ production and limits on anomalous quartic gauge couplings in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 6, p. 82. doi: 10.1007/jhep06(2023)082
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ISSN of the journal1029-8479
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