QCD running coupling in low-energy region

2010/04/29 by Gurjav Ganbold
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.81.094008

published as Phys.Rev.D81:094008,2010 · 16 pages, 5 figures, 2 tables

arxiv created 2010/04/29 · openalex publication_date 2010/05/05 · arxiv updated 2010/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We estimate the QCD effective charge \ensuremathα_s in the low-energy region by exploiting the conventional meson spectrum within a relativistic quantum-field model based on analytic confinement. The ladder Bethe-Salpeter equation is solved for the masses of two-quark bound states. We found a new, independent, and specific infrared-finite behavior of QCD coupling below energy scale 1 GeV. Particularly, an infrared-fixed point is extracted at \ensuremathα_s(0)\ensuremath≃0.757 for confinement scale \ensuremathΛ=345 MeV. As an application, we estimate masses of some intermediate and heavy mesons and obtain results in reasonable agreement with recent experimental data.

Citations

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