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

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arxiv hep-ex/0001055 v1 pith:23ITRNJP submitted 2000-01-24 hep-ex

The Jade , the OPAL collaborations , P.Pfeifenschneider , et al This is my paper · ORCID
classification hep-ex
keywords alphadataobservablespredictionscomparedcouplingenergiesenergy
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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_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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons

    hep-ph 2025-07 conditional novelty 6.0 of 10

    The Alaric shower is matched to NLO matrix elements and merged to five jets in e+e- to hadrons, with new analytic subtraction terms validated against Catani-Seymour subtraction.

  2. Fits of $\alpha_s$ from event-shapes in the three-jet region: extension to all energies

    hep-ph 2025-01 conditional novelty 4.0 of 10

    The strong coupling at the Z mass is measured as 0.1181 from event-shape distributions using three-jet power corrections, with hadron-mass scheme ambiguity as the largest uncertainty.

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