In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2020, No. 3 ( 2020-03)
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 $$ \sqrt{s} $$ 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 + 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 + 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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP03(2020)054
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
2027350-2