Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at s = 13 TeV
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Published version
Author(s)
Type
Journal Article
Abstract
A measurement is presented of a ratio observable that provides a measure of the azimuthal correlations
among jets with large transverse momentum pT . This observable is measured in multijet events over the range of pT = 360–3170 GeV based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 134 fb−1 . The results are compared with predictions from
Monte Carlo parton-shower event generator simulations, as
well as with fixed-order perturbative quantum
chromodynamics (pQCD) predictions at next-to-leading-order (NLO) accuracy obtained with different parton distribution functions (PDFs) and corrected for nonperturbative and electroweak effects. Data and theory agree within uncertainties. From the comparison of the measured observable with the pQCD prediction obtained with the NNPDF3.1 NLO PDFs, the strong coupling at the Z boson mass scale is αS(mZ) = 0.1177 ± 0.0013 (exp)+0.0116
−0.0073 (theo) = 0.1177+0.0117−0.0074 , where the total uncertainty is dominated by the scale dependence
of the fixed-order predictions. A test of the running of αS in
the TeV region shows no deviation from the expected NLO
pQCD behaviour.
among jets with large transverse momentum pT . This observable is measured in multijet events over the range of pT = 360–3170 GeV based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 134 fb−1 . The results are compared with predictions from
Monte Carlo parton-shower event generator simulations, as
well as with fixed-order perturbative quantum
chromodynamics (pQCD) predictions at next-to-leading-order (NLO) accuracy obtained with different parton distribution functions (PDFs) and corrected for nonperturbative and electroweak effects. Data and theory agree within uncertainties. From the comparison of the measured observable with the pQCD prediction obtained with the NNPDF3.1 NLO PDFs, the strong coupling at the Z boson mass scale is αS(mZ) = 0.1177 ± 0.0013 (exp)+0.0116
−0.0073 (theo) = 0.1177+0.0117−0.0074 , where the total uncertainty is dominated by the scale dependence
of the fixed-order predictions. A test of the running of αS in
the TeV region shows no deviation from the expected NLO
pQCD behaviour.
Date Issued
2024-08-21
Date Acceptance
2024-07-11
Citation
European Physical Journal C: Particles and Fields, 2024, 84 (8)
ISSN
1124-1861
Publisher
SpringerOpen
Journal / Book Title
European Physical Journal C: Particles and Fields
Volume
84
Issue
8
Copyright Statement
© CERN for the benefit of the CMS collaboration 2024. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Funded by SCOAP3.
License URL
Identifier
https://doi.org/10.1140/epjc/s10052-024-13116-7
Publication Status
Published
Article Number
ARTN 842