Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector

ATLAS Collaboration, Paul Newman

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Abstract

A measurement of prompt photon-pair production in proton-proton collisions at √s = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb−1. Events with two photons in the well-instrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of pT,γ1(2) > 40 (30) GeV for the leading (sub-leading) photon. The differential cross sections as functions of several observables for the diphoton system are measured and compared with theoretical predictions from state-of-the-art Monte Carlo and fixed-order calculations. The QCD predictions from next-to-next-to-leading-order calculations and multi-leg merged calculations are able to describe the measured integrated and differential cross sections within uncertainties, whereas lower-order calculations show significant deviations, demonstrating that higher-order perturbative QCD corrections are crucial for this process. The resummed predictions with parton showers additionally provide an excellent description of the low transverse-momentum regime of the diphoton system.
Original languageEnglish
Article number169
Number of pages53
JournalJHEP
Volume2021
Issue number11
DOIs
Publication statusPublished - 22 Nov 2021

Bibliographical note

52 pages in total, author list starting page 36, 12 figures, 5 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-30/

Keywords

  • hep-ex
  • Hadron-Hadron scattering (experiments)
  • photon production
  • proton-proton scattering
  • QCD

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