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



Aad, G, Abbott, B, Abbott, DC, Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2945 more authors) (2020) Measurement of the <i>Z</i>(<i>→ l</i><SUP>+</SUP><i>l<SUP>-</SUP></i>)γ production cross-section in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector. .

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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 $\sqrt{s} =$ 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 $pp \rightarrow \ell^+\ell^-\gamma+X$ ($\ell = e, \mu$) 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 $\ell^+\ell^-\gamma$ 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.

Item Type: Conference or Workshop Item (Unspecified)
Additional Information: 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/
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 05 Dec 2019 15:35
Last Modified: 16 Mar 2024 01:46
DOI: 10.1007/JHEP03(2020)054
Open Access URL: http://www.actaphys.uj.edu.pl/fulltext?series=Reg&...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3064994