QCD Analyses and determinations of alpha-s in e+e- Annihilation at energies between 35 and 189 GeV

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dc.creatorJade, The
dc.creatorcollaborations, the OPAL
dc.creatorPfeifenschneider, P.
dc.date2000-01-24
dc.date.accessioned2026-07-07T12:01:27Z
dc.date.available2026-07-07T12:01:27Z
dc.descriptionWe 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_s^2) calculations, as well as matched O(alpha_s^2) 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_s^2) 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.
dc.description49 pages, 17 figures, submitted to Eur.Phys.J. C
dc.identifierhttps://arxiv.org/abs/hep-ex/0001055
dc.identifierhttp://arxiv.org/abs/hep-ex/0001055
dc.identifierEur.Phys.J.C17:19-51,2000
dc.identifierdoi:10.1007/s100520000432
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207104
dc.subjectHigh Energy Physics - Experiment
dc.titleQCD Analyses and determinations of alpha-s in e+e- Annihilation at energies between 35 and 189 GeV
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