Bound state approach to the QCD coupling at low energy scales
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
We exploit theoretical results on the meson spectrum within the framework of a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an ``experimental'' coupling \alpha_s^{exp}(Q^2) below 1 GeV by comparison with the data. Our results for \alpha_s^{exp}(Q^2) exhibit a good agreement with the infrared safe Analytic Perturbation Theory (APT) coupling from 1 GeV down to 200 MeV. As a main result, we claim that the combined BS-APT theoretical scheme provides us with a rather satisfactory correlated understanding of very high and low energy phenomena.
Keywords
Cite
@article{arxiv.0705.0329,
title = {Bound state approach to the QCD coupling at low energy scales},
author = {M. Baldicchi and A. V. Nesterenko and G. M. Prosperi and D. V. Shirkov and C. Simolo},
journal= {arXiv preprint arXiv:0705.0329},
year = {2008}
}
Comments
Revised version, to appear on Physical Review Letters. 7 pages, 2 figures, Revtex