Measurement of alphas with JADE using Moments of event shape observables and the Four-Jet Rate
Abstract
Data from e+e-annihilation into hadrons collected by the JADE experiment at centre-of-mass energies between 14 GeV and 44 GeV were used to study moments of event shape distributions and the four-jet rate as a function of the Durham algorithm's resolution parameter ycut. The data were compared to a QCD NLO order calculations and including NLLA resummation in the case of the four-jet rate. The strong coupling measured from the moments was alphas(MZ)=0.1286+-0.0007(stat)+-0.0011(exp)+-0.0022(had)+-0.0068(theo) and from the four-jet rate was alphas(MZ)=0.1169+-0.0004(stat)+-0.0012(exp)+-0.0021(had)+-0.0007(theo) both in agreement with the world average.
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