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

Date

2020

Authors

Aad, G.
Abbott, B.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
AbouZeid, O.S.
Abraham, N.L.
Abramowicz, H.
Abreu, H.

Journal Title

Journal ISSN

Volume Title

Publisher

Journal of High Energy Physics

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+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.

Description

Keywords

Hadron-Hadron scattering (experiments)

Citation

Aad, G., Abbott, B., Abbott, D. C., Abed Abud, A., Abeling, K., Abhayasinghe, D. K., … Zwalinkski, L. (2020). Measurement of the Z(→ ℓ+ℓ−)γ production cross-section in pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2020(54). https://doi.org/10.1007/JHEP03(2020)054