Collaboration, ATLAS
(2023)
A precise determination of the strong-coupling constant from the recoil
of $Z$ bosons with the ATLAS experiment at $\sqrt{s} = 8$ TeV.
[Preprint]
|
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2309.12986v1.pdf - Preprint version Download (1MB) | Preview |
Abstract
The coupling constant of the strong force is determined from the transverse-momentum distribution of $Z$ bosons produced in 8 TeV proton-proton collisions at the LHC and recorded by the ATLAS experiment. The $Z$-boson cross sections are measured in the full phase space of the decay leptons using 15.3 million electron and muon pairs, in a dataset collected in 2012 and corresponding to an integrated luminosity of 20.2 fb$^{-1}$. The analysis is based on predictions evaluated at third order in perturbative QCD, supplemented by the resummation of logarithmically enhanced contributions in the low transverse-momentum region of the lepton pairs. The determined value of the strong coupling at the reference scale corresponding to the $Z$-boson mass is $\alpha_\text{s}(m_Z) = 0.1183 \pm 0.0009$. This is the most precise experimental determination of $\alpha_\text{s}(m_Z)$ achieved so far.
| Item Type: | Preprint |
|---|---|
| Additional Information: | 43 pages in total, author list starting page 26, 8 figures, 2 tables, submitted to Nature Phys. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2023-01 |
| Uncontrolled Keywords: | hep-ex, hep-ex, hep-ph |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 26 Feb 2024 16:16 |
| Last Modified: | 26 Feb 2024 16:16 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3178899 |
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