Bazavov, AlexeiGarcia i Tormo, XavierPetreczky, PéterSoto Riera, JoanVairo, AntonioBrambilla, Nora2019-04-082019-04-082012-12-201550-7998https://hdl.handle.net/2445/131794We compare lattice data for the short-distance part of the static energy in 2+1 flavor quantum chromodynamics (QCD) with perturbative calculations, up to next-to-next-to-next-to leading-logarithmic accuracy. We show that perturbation theory describes very well the lattice data at short distances, and exploit this fact to obtain a determination of the product of the lattice scale r_0 with the QCD scale Lambda_{MS}. With the input of the value of r_0, this provides a determination of the strong coupling alpha_s at the typical distance scale of the lattice data. We obtain alpha_s(1.5 GeV)=0.326\pm0.019, which provides a novel determination of alpha_s at low energy and with three-loop accuracy (including resummation of the leading ultrasoft logarithms). When this value is evolved to the Z-mass scale M_Z, it corresponds to alpha_s(M_Z)=0.1156^{+0.0021}_{-0.0022}.5 p.application/pdfeng(c) American Physical Society, 2012Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6237782019-04-08info:eu-repo/semantics/openAccess