Speaker
Hiromasa Takaura
(Kyushu University)
Description
We determine the strong coupling constant alpha_s from the static QCD potential by matching a theoretical calculation with lattice QCD computation. We adopt a new theoretical framework where we subtract the renormalon uncertainties, which limit the accuracy of perturbation theory, based on OPE. This allows us to take a considerably wider fitting range than ordinary perturbation theory, which leads to a more reliable determination. We obtain alpha_s(M_Z) with 1.3 % accuracy, which is consistent with the current PDG value.
