Theoretical uncertainties for measurements of alphas from electroweak observables
H. Stenzel
Abstract
One of the most precise measurements of the strong coupling constant alphas(MZ) is obtained in the context of global analyses of precision electroweak data. This article reviews the sensitivity of different electroweak observables to alphas and describes the perturbative uncertainties related to missing higher orders. The complete renormalisation scale dependence for the relevant observables is calculated at next-to-next-to-leading order and a new method is presented to determine the corresponding perturbative uncertainty for measurements of alphas based on these observables.
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