TL;DR
This study uses event shape data from e+e- annihilation collected by the JADE experiment to measure the strong coupling constant alpha_S, confirming its energy dependence as predicted by QCD with high confidence.
Contribution
It provides a precise determination of alpha_S at different energies using NNLO and NNLO+NLLA QCD predictions, improving stability over previous NLO-based results.
Findings
Alpha_S decreases with increasing energy, consistent with asymptotic freedom.
Results exclude no running of alpha_S at 99% confidence level.
Enhanced stability of alpha_S extraction with NNLO and NNLO+NLLA predictions.
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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Taxonomy
TopicsGeological and Geochemical Analysis · earthquake and tectonic studies · Planetary Science and Exploration