Measurement of the $Z(\rightarrow\ell^+\ell^-)γ$ production cross-section in 
$pp$ collisions at $\sqrt{s} =13$ TeV with the ATLAS detector

ATLAS Collaboration,

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Measurement of the $Z(\rightarrow\ell^+\ell^-)γ$ production cross-section in $pp$ collisions at $\sqrt{s} =13$ TeV with the ATLAS detector

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ATLAS Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2020). Measurement of the $Z(\rightarrow\ell^+\ell^-)γ$ production cross-section in $pp$ collisions at $\sqrt{s} =13$ TeV with the ATLAS detector. Journal of High Energy Physics, 03, 054. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-229.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1AA3-3

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.