Title:
|
Determination of αs from the QCD static energy
|
Author:
|
Bazavov, Alexei; Garcia i Tormo, Xavier; Petreczky, Péter; Soto Riera, Joan; Vairo, Antonio; Brambilla, Nora
|
Other authors:
|
Universitat de Barcelona |
Abstract:
|
We 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}. |
Subject(s):
|
-Física de partícules -Experiments -Particle physics -Experiments |
Rights:
|
(c) American Physical Society, 2012
|
Document type:
|
Article Article - Published version |
Published by:
|
American Physical Society
|
Share:
|
|