Tests of Power Corrections for Event Shapes in e+e- Annihilation

Details Tests of Power Corrections for Event Shapes in e+e- Annihilation Tests of Power Corrections for Event Shapes in e+e- Annihilation

2001-05-21

arxiv.org/abs/hep-ex/0105059v2

Eur.Phys.J.C22:1-15,2001

Physics

High Energy Physics

High Energy Physics - Experiment

28 pages, LaTeX2e, 21 .eps-files included, accepted by Eur. Phys. J. C

Scientific paper

10.1007/s100520100750

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 alpha_S(M_Z) and the free parameter of the power correction calculations alpha_0(2 GeV) are measured to be alpha_S(M_Z) = 0.1171 +/- 0.0032/0.0020 and alpha_0(2 GeV) = 0.513 +/- 0.066/0.045. The predicted universality of alpha_0 is confirmed within the uncertainties of the measurements.

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