The determination of alphas(Mz) from perturbative analyses of short-distance-sensitive lattice QCD observables revisited
Abstract
The determination of alphas(MZ) via perturbative analyses of short-distance-sensitive lattice observables is revisited, incorporating new lattice data and performing a modified version of the original analysis. The analysis employs two high-intrinsic-scale observables, log (W11) and log(W12), and one lower-intrinsic-scale observable, log(W12/u06). We find good consistency among the values extracted using the different observables and a final result, alphas(MZ)=0.1192(11), in excellent agreement with various recent non-lattice determinations, as well as with the results of a similar, but not identical, re-analysis by the HPQCD collaboration. The relation between the two re-analyses is discussed, focussing on the complementarity of the two approaches.