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

ATLAS Collaboration

Preprint

PUBDB-2022-07186

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

ATLAS Collaboration (Collaboration author)DESY*

2022

[10.3204/PUBDB-2022-07186]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-07186

Report No.: CERN-EP-2022-192; arXiv:2211.14171

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.

Keyword(s): cross section, measured ; higher-order, 1 ; muon, decay ; p p, scattering ; ATLAS ; TeV ; quantum chromodynamics ; coupling constant ; two-photon ; differential cross section ; photon ; CERN LHC Coll ; lepton ; electron ; kinematics ; phase space ; effective field theory ; Monte Carlo

Note: 26 pages in total, 10 figures, 4 tables, submitted to EPJ C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2021-09/

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