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

Belyaev, A.V.; Boos, E.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Klyukhin, V.; Kodolova, O.; Lukina, O.; Obraztsov, S.; Petrushanko, S.V.; Savrin, V.; Snigirev, A.; Vardanyan, I.; CMS, C.

Авторы: Belyaev A.V., Boos E., Dubinin M., Dudko L., Ershov A.A., Klyukhin V., Kodolova O., Lukina O., Obraztsov S., Petrushanko S.V., Savrin V., Snigirev A., Vardanyan I., CMS Collaboration
Журнал: European Physical Journal C
Том: 84
Год издания: 2024
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 842
DOI: 10.1140/epjc/s10052-024-13116-7
Аннотация: A measurement is presented of a ratio observ-able that provides a measure of the azimuthal correlations among jets with large transverse momentum p_T. This observable is measured in multijet events over the range of p_T = 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 α_S(m_Z) = 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 α_S in the TeV region shows no deviation from the expected NLO pQCD behaviour.
Добавил в систему: Клюхин Вячеслав Иванович

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

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