A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at √s=8 TeV



Aad, G, Abbott, B, Abeling, K, Abicht, NJ, Abidi, SH, Aboulhormae, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, AC Abusleme
et al (show 2914 more authors) (2024) A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at √s=8 TeV EUROPEAN PHYSICAL JOURNAL C, 84 (3). 315-. ISSN 1434-6044, 1434-6052

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Abstract

This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at s=8 TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb<sup>-1</sup>. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum p<inf>T</inf> and rapidity y are measured in the pole region, defined as 80<m<sup>ℓℓ</sup><100 GeV, over the range |y|<3.6. The total uncertainty of the normalised cross-section measurements in the peak region of the p<inf>T</inf> distribution is dominated by statistical uncertainties over the full range and increases as a function of rapidity from 0.5–1.0% for |y|<2.0 to 2-7% at higher rapidities. The results for the rapidity-dependent transverse momentum distributions are compared to state-of-the-art QCD predictions, which combine in the best cases approximate N<sup>4</sup>LL resummation with N<sup>3</sup>LO fixed-order perturbative calculations. The differential rapidity distributions integrated over p<inf>T</inf> are even more precise, with accuracies from 0.2–0.3% for |y|<2.0 to 0.4–0.9% at higher rapidities, and are compared to fixed-order QCD predictions using the most recent parton distribution functions. The agreement between data and predictions is quite good in most cases.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Health & Life Sciences
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Health & Life Sciences > Inst. Systems, Molec & Integrative Biology > Inst. Systems, Molec & Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 05 Apr 2024 10:53
Last Modified: 23 May 2026 08:38
DOI: 10.1140/epjc/s10052-024-12438-w
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3180104
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