Determination of the strong coupling alpha_s from the QCD static energy

TL;DR

This paper determines the strong coupling constant alpha_s in QCD by comparing perturbative calculations with lattice data for the static energy, providing a precise value at a specific energy scale.

Contribution

The study introduces a novel method of extracting alpha_s by combining perturbative and lattice QCD calculations for the static energy.

Findings

alpha_s(1.5GeV)=0.326±0.019

alpha_s(M_Z)=0.1156^{+0.0021}_{-0.0022}

demonstrates consistency between perturbative and lattice results

Abstract

We obtain a determination of the strong coupling alpha_s in quantum chromodynamics, by comparing perturbative calculations for the short-distance part of the static energy with lattice computations. Our result reads alpha_s(1.5GeV)=0.326\pm0.019, and when evolved to the scale M_Z (the Z-boson mass) it corresponds to alpha_s(M_Z)=0.1156^{+0.0021}_{-0.0022}.