Studies of QCD at LEPII
Abstract
A combination of measurements of alphas in e+e- annihilation at LEP is presented. Distributions of various event-shape variables measured by ALEPH, DELPHI, L3 and OPAL at centre-of-mass energies from 41 GeV to 206 GeV are analysed in a common theoretical framework using O(as**2)+NLLA predictions. The dominant theoretical uncertainties associated to missing higher orders are studied in detail.
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