The Realistic Lattice Determination of alpha_s(M_Z) Revisited

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  • 13 July 2008
Abstract
We revisit the earlier determination of alpha_s(M_Z) via perturbative analyses of short-distance-sensitive lattice observables, incorporating new lattice data and performing a modified analysis designed to deal with a particular complication, of potential numerical importance, identified in the earlier analysis. We focus on two high-intrinsic-scale observables, log(W_11) and log(W_12), and one lower-intrinsic scale observable, logW_{12}/u_0^6), in order to highlight the impact of this complication on the results for alpha_s(M_Z). We find improved consistency among the values extracted using the different observables and a final result, alpha_s(M_Z)=0.1192(11), which is (i) roughly 2 sigma higher than the earlier HPQCD/UKQCD result and (ii) in excellent agreement with the results of various recent non-lattice determinations.

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