The determination of αs(M_Z) from perturbative analyses of short-distance-sensitive lattice QCD observables revisited

Abstract

The determination of αs(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=u60). We find good consistency among the values extracted using the different observables and a final result, αs(MZ) = 0.1192±0:0011, 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.