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

0535236 - FZÚ 2021 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2955 authors
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. Roč. 2020, č. 3 (2020), s. 1-52, č. článku 54. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT(CZ) LTT17018
Research Infrastructure: CERN-CZ II - 90104
Institutional support: RVO:68378271
Keywords : ATLAS * CERN * LHC * hadroproduction * electroweak interaction * perturbation theory
OECD category: Particles and field physics
Impact factor: 5.810, year: 2020
Method of publishing: Open access

The production of a prompt photon in association with a ZZ 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}−1 collected by the ATLAS detector at the LHC from 2015 to 2018. The production cross-section for the process pp ightarrow ell^+ell^-gamma+Xpp→ℓ + ℓ −γ+X (ell = e, muℓ=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 ell^+ell^-gammaℓ + 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.

Permanent Link: http://hdl.handle.net/11104/0313313