QCD running coupling in low-energy region

Journal Article · Sat May 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.094008· OSTI ID:21409932

Ganbold, Gurjav ^[1]

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1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation) and Institute of Physics and Technology, 210651 Ulaanbaatar (Mongolia)

We estimate the QCD effective charge {alpha}{sub 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 {alpha}{sub s}(0){approx_equal}0.757 for confinement scale {Lambda}=345 MeV. As an application, we estimate masses of some intermediate and heavy mesons and obtain results in reasonable agreement with recent experimental data.

• OSTI ID: 21409932
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BETHE-SALPETER EQUATION
BOSONS
BOUND STATE
COUPLING
EFFECTIVE CHARGE
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 01-10
HADRONS
MASS
MESON SPECTROSCOPY
MESONS
MEV RANGE
MEV RANGE 100-1000
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
RELATIVISTIC RANGE
SPECTROSCOPY