Realistic lattice determination of αs(MZ) revisited

Abstract

We revisit the earlier determination of αs(MZ) via perturbative analyses of short-distance-sensitive lattice observables, incorporating new lattice data and performing a modified version of the original analysis. We focus on two high-intrinsic-scale observables, log⁡(W11) and log⁡(W12), and one lower-intrinsic-scale observable, log⁡(W12/u06), finding improved consistency among the values extracted using the different observables and a final result, αs(MZ)=0.1192±0.0011, ∼2σ higher than the earlier result, in excellent agreement with recent nonlattice determinations and, in addition, in good agreement with the results of a similar, but not identical, reanalysis by the HPQCD Collaboration. A discussion of the relation between the two reanalyses is given, focusing on the complementary aspects of the two approaches.