Theoretical uncertainties for measurements of alpha_s from electroweak observables

Details Theoretical uncertainties for measurements of alpha_s from electroweak observables Theoretical uncertainties for measurements of alpha_s from electroweak observables

2005-01-26

arxiv.org/abs/hep-ph/0501245v4

JHEP0507:0132,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

v4: Revised version with new tables and figures

Scientific paper

10.1088/1126-6708/2005/07/013

One of the most precise measurements of the strong coupling constant alpha_s(MZ) is obtained in the context of global analyses of precision electroweak data. This article reviews the sensitivity of different electroweak observables to alpha_s 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 alpha_s based on these observables.

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