alpha_s(MZ) from Jade Event Shapes

Details alpha_s(MZ) from Jade Event Shapes alpha_s(MZ) from Jade Event Shapes

2009-05-29

arxiv.org/abs/0905.4891v1

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

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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