Abstract
Consistent measurements of event-shape variables and as using the complete set of data taken with the ALEPH detector at LEP are presented. The strong coupling constant is determined from a fit of O( α s 2) + NLLA QCD calculations to distributions of six event-shape variables at eight centre-of-mass energies. A new method is proposed to estimate theoretical systematic uncertainties. The results are compared to the expected evolution of α s .
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