alpha_s(MZ) from Jade Event Shapes

2009/05/29 by S. Kluth, Kluth, S.
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Geological and Geochemical Analysis #High Energy Physics - Experiment (hep-ex) #Planetary Science and Exploration #earthquake and tectonic studies #hep-ex

paper · pdf · doi:10.48550/arxiv.0905.4891

Contribution to Moriond QCD and High Energy Interactions 14-21 March 2009 4 pages, 4 figures

arxiv created 2009/05/29 · openalex publication_date 2009/05/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Event shape data from e+e- annihilation into hadrons collected by the JADE experiment between sqrt(s)=14 and 44 GeV are used to determine the strong coupling alpha_S. QCD predictionscomplete to next-to-next-to-leading order (NLLO), alternatively combined with next-to-leading-log-approximation (NLLA) are used. The stability of the NNLO and NNLO+NLLA results with respect to variations of the renormalisation scale is improved compared to previous results obtained with next-to-leading-order (NLO) or NLO+NLLA predictions. The energy dependence of alpha_S agrees with the QCD prediction of asymptotic freedom and excludes absence of running with 99% confidence level.

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