Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at √s=13 TeV

(CMS Collaboration) Hayrapetyan, Aram; ... ; Giljanović, Duje; Godinović, Nikola; Lelas, Damir; Šćulac, Ana; Kovač, Marko; Šćulac, Toni; Bargassa, Pedrame; Brigljević, Vuko; Chitroda, Bhakti Kanulal; Ferenček, Dinko; Mishra, Saswat; Starodumov, Andrey; Šuša, Tatjana; ... ; Roguljić, Matej; ...; Zhokin, Alexander (2024) Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at √s=13 TeV. European Physical Journal C: Particles and Fields, 84 (8). ISSN 1434-6044

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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=360–3170GeV based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 134fb-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)-0.0073 +0.0116(theo)=0.1177-0.0074 +0.0117, 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.

Item Type:	Article
Uncontrolled Keywords:	High energy physics; Experimental particle physics; LHC; CMS; p p: colliding beams; quantum chromodynamics: perturbation theory; jet: multiple production; parton: distribution function; p p: scattering; Z0: mass; mass: scale; electroweak interaction: effect; higher-order: 1; perturbation theory: higher-order; numerical calculations: Monte Carlo; angular correlation; strong coupling; strong interaction: coupling constant; jet: transverse momentum: high; nonperturbative
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Virna Brumnić
Date Deposited:	08 Oct 2024 09:57
URI:	http://fulir.irb.hr/id/eprint/9130
DOI:	10.1140/epjc/s10052-024-13116-7

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