Measurement of the Z(→ ℓ +)γ production cross-section in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration

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Abstract

The production of a prompt photon in association with a Z boson is studied in proton-proton collisions at a centre-of-mass energy √s = 13 TeV. The analysis uses a data sample with an integrated luminosity of 139 fb −1 collected by the ATLAS detector at the LHC from 2015 to 2018. The production cross-section for the process pp → ℓ +γ + X (ℓ = e, μ) is measured within a fiducial phase-space region defined by kinematic requirements on the photon and the leptons, and by isolation requirements on the photon. An experimental precision of 2.9% is achieved for the fiducial cross-section. Differential cross-sections are measured as a function of each of six kinematic variables characterising the ℓ +γ system. The data are compared with theoretical predictions based on next-to-leading-order and next-to-next-to-leading-order perturbative QCD calculations. The impact of next-to-leading-order electroweak corrections is also considered. [Figure not available: see fulltext.].

Original languageEnglish
Article number54
Number of pages52
JournalJHEP
Volume2020
Issue number3
DOIs
Publication statusPublished - 10 Mar 2020

Bibliographical note

51 pages in total, author list starting page 35, 7 figures, 6 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-04/

Keywords

  • hep-ex
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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