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  4. Determination of the strong coupling constant $\alpha_{S}(m_\mathrm{Z})$ from measurements of inclusive W$^\pm$ and Z boson production cross sections in proton-proton collisions at $\sqrt{s} =$ 7 and 8 TeV
 
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Determination of the strong coupling constant $\alpha_{S}(m_\mathrm{Z})$ from measurements of inclusive W$^\pm$ and Z boson production cross sections in proton-proton collisions at $\sqrt{s} =$ 7 and 8 TeV

Sirunyan, Albert M
•
Tumasyan, Armen
•
Adam, Wolfgang
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December 9, 2019

Twelve measurements of inclusive cross sections of W$^\pm$ and Z boson production, performed in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, are compared with perturbative quantum chromodynamics calculations at next-to-next-to-leading order (NNLO) accuracy obtained with the CT14, HERAPDF2.0, MMHT14, and NNPDF3.0 parton distribution functions (PDFs). Data and theory agree well for all PDF sets, taking into account the experimental and theoretical uncertainties. A novel procedure is employed to extract the strong coupling constant at the Z pole mass from a detailed comparison of all the experimental fiducial cross sections to the corresponding NNLO theoretical predictions, yielding $\alpha_{S}(m_\mathrm{Z}) =$ 0.1163$^{+0.0024}{-0.0031}$ (CT14), 0.1072$^{+0.0043}{-0.0040}$ (HERAPDF2.0), 0.1186$\pm$0.0025 (MMHT14), and 0.1147$\pm$0.0023 (NNPDF3.0). Using the results obtained with the CT14 and MMHT14 PDFs, which yield the most robust and stable $\alpha_{S}(m_\mathrm{Z})$ extractions, a value $\alpha_{S}(m_\mathrm{Z}) =$ 0.1175$^{+0.0025}_{-0.0028}$ is determined.

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Type
report
Author(s)
Sirunyan, Albert M
Tumasyan, Armen
Adam, Wolfgang
Ambrogi, Federico
Bergauer, Thomas
Dragicevic, Marko
Erö, Janos
Escalante Del Valle, Alberto
Flechl, Martin
Fruehwirth, Rudolf
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Date Issued

2019-12-09

Written at

OTHER

EPFL units
LPHE  
Available on Infoscience
February 17, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/166006
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