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Scientific article
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English

Measurement of $Z\gamma \gamma $ production in pp collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

ContributorsATLAS Collaboration
Publication date2023
First online date2023-06-27
Abstract

Cross-sections for the production of a Z boson in association with two photons are measured in proton–proton collisions at a centre-of-mass energy of 13 TeV. The data used correspond to an integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS experiment during Run 2 of the LHC. The measurements use the electron and muon decay channels of the Z boson, and a fiducial phase-space region where the photons are not radiated from the leptons. The integrated $Z(\rightarrow \ell \ell )\gamma \gamma $ cross-section is measured with a precision of 12% and differential cross-sections are measured as a function of six kinematic variables of the $Z\gamma \gamma $ system. The data are compared with predictions from MC event generators which are accurate to up to next-to-leading order in QCD. The cross-section measurements are used to set limits on the coupling strengths of dimension-8 operators in the framework of an effective field theory.

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Keywords
  • P p: colliding beams
  • Photon: pair production
  • Z0: associated production
  • Z0: leptonic decay
  • Channel cross section: measured
  • Higher-order: 1
  • Perturbation theory: higher-order
  • Dilepton: transverse momentum
  • Photon: transverse energy
  • P p: scattering
  • ATLAS
  • Quantum chromodynamics
  • Coupling constant
  • Mass spectrum: two-photon
  • Differential cross section: measured
  • Energy dependence
  • Transverse momentum dependence
  • Mass dependence
  • CERN LHC Coll
  • Muon: pair production
  • Electron: pair production
  • Kinematics
  • Phase space
  • Effective field theory
  • Operator: higher-dimensional
  • Dimension: 8
  • Numerical calculations: Monte Carlo
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of $Z\gamma \gamma $ production in pp collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector. In: European physical journal. C, Particles and fields, 2023, vol. 83, p. 539. doi: 10.1140/epjc/s10052-023-11579-8
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Article (Published version)
Identifiers
ISSN of the journal1434-6044
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