Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 83, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-023-11579-8
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In this study, the cross-sections for the production of a Z boson in association with two photons in proton-proton collisions at a centre-of-mass energy of 13 TeV were measured. The data obtained were used to set limits on the coupling strengths of dimension-8 operators in the framework of an effective field theory.
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(-> ll)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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