QCD analyses and determinations of α_s in \rm e⁺\rm e^- annihilation at energies between 35 and 189 GeV

2000/01/24 by The Jade, the OPAL collaborations, G. Abbiendi et al. +1 · 7 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ex

paper · pdf · doi:10.1007/s100520000432

published as Eur.Phys.J.C17:19-51,2000 · 49 pages, 17 figures, submitted to Eur.Phys.J. C

arxiv created 2000/01/24 · openalex publication_date 2000/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

We employ data taken by the JADE and OPAL experiments for an integrated QCD study in hadronic e+e- annihilations at c.m.s. energies ranging from 35 GeV through 189 GeV. The study is based on jet-multiplicity related observables. The observables are obtained to high jet resolution scales with the JADE, Durham, Cambridge and cone jet finders, and compared with the predictions of various QCD and Monte Carlo models. The strong coupling strength, alpha_s, is determined at each energy by fits of O(alpha_s²) calculations, as well as matched O(alpha_s²) and NLLA predictions, to the data. Matching schemes are compared, and the dependence of the results on the choice of the renormalization scale is investigated. The combination of the results using matched predictions gives alpha_s(MZ)=0.1187+0.0034-0.0019. The strong coupling is also obtained, at lower precision, from O(alpha_s²) fits of the c.m.s. energy evolution of some of the observables. A qualitative comparison is made between the data and a recent MLLA prediction for mean jet multiplicities.

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