CERN Accelerating science

Article
Report number	arXiv:1902.08158 ; MPP-2019-37 ; CERN-TH-2019-015 ; MITP/19-012
Title	High precision determination of $\alpha_s$ from a global fit of jet rates
Author(s)	Verbytskyi, Andrii (Munich, Max Planck Inst.) ; Banfi, Andrea (Sussex U.) ; Kardos, Adam (Debrecen U.) ; Monni, Pier Francesco (CERN) ; Kluth, Stefan (Munich, Max Planck Inst.) ; Somogyi, Gábor (MTA-DE, Debrecen) ; Szőr, Zoltán (U. Mainz, PRISMA) ; Trócsányi, Zoltán (MTA-DE, Debrecen ; Eotvos U.) ; Tulipánt, Zoltán (MTA-DE, Debrecen) ; Zanderighi, Giulia (Munich, Max Planck Inst.)
Publication	2019-08-23
Imprint	2019-02-21
Number of pages	33
Note	36 pages,13 figures, 5 tables
In:	JHEP 1908 (2019) 129
DOI	10.1007/JHEP08(2019)129
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	We present state-of-the-art extractions of the strong coupling based on N$^3$LO+NNLL accurate predictions for the two-jet rate in the Durham clustering algorithm at $e^+e^-$ collisions, as well as a simultaneous fit of the two- and three-jet rates taking into account correlations between the two observables. The fits are performed on a large range of data sets collected at LEP and PETRA colliders, with energies spanning from $35$ GeV to $207$ GeV. Owing to the high accuracy of the predictions used, the perturbative uncertainty is considerably smaller than that due to hadronization. Our best determination at the $Z$ mass is $\alpha_s(M_Z) = 0.11881 \pm 0.00063(exp.) \pm 0.00101(hadr.) \pm 0.00045(ren.) \pm 0.00034(res.)$, which is in agreement with the latest world average and has a comparable total uncertainty.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)

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