αs(mZ) from tau decays with matching conditions at three loops
German Rodrigo, Antonio Pich, Arcadi Santamaria
Abstract
Using the recent four-loop calculations of the QCD beta-function and the three-loop matching coefficients we study the induced error in αs(mZ) obtained from αs(mtau) due to the evolution procedure. We show that, when consistent matching and running is used at this order, these errors are pushed below 0.0005 in αs(mZ).
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