Tests of Power Corrections for Event Shapes in e+e- Annihilation
Abstract
A study of perturbative QCD calculations combined with power corrections to model hadronisation effects is presented. The QCD predictions are fitted to differential distributions and mean values of event shape observables measured in e+e- annihilation at centre-of-mass energies from 14 to 189 GeV. We investigate the event shape observables thrust, heavy jet mass, C-parameter, total and wide jet broadening and differential 2-jet rate and observe a good description of the data by the QCD predictions. The strong coupling constant alphaS(MZ) and the free parameter of the power correction calculations alpha0(2 GeV) are measured to be alphaS(MZ) = 0.1171 +/- 0.0032/0.0020 and alpha0(2 GeV) = 0.513 +/- 0.066/0.045. The predicted universality of alpha0 is confirmed within the uncertainties of the measurements.
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