alpha_s(MZ) from Jade Event Shapes
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.
Cite
@article{arxiv.0905.4891,
title = {alpha_s(MZ) from Jade Event Shapes},
author = {S. Kluth},
journal= {arXiv preprint arXiv:0905.4891},
year = {2009}
}
Comments
Contribution to Moriond QCD and High Energy Interactions 14-21 March 2009 4 pages, 4 figures