The Infrared Behaviour of the Running Coupling in Landau Gauge QCD
R. Alkofer, C. S. Fischer, L. von Smekal
TL;DR
This paper presents approximate solutions for gluon and ghost propagators in Landau gauge QCD, showing they agree with lattice results and revealing an infrared fixed point for the running coupling.
Contribution
It provides new Dyson-Schwinger equation solutions for propagators and the running coupling, highlighting an infrared fixed point consistent across gauge groups.
Findings
Propagators match recent lattice calculations
Running coupling has an infrared fixed point
Approaches perturbative form above 1 GeV
Abstract
Approximate solutions for the gluon and ghost propagators as well as the running coupling in Landau gauge Yang-Mills theories are presented. These propagators obtained from the corresponding Dyson-Schwinger equations are in remarkable agreement with those of recent lattice calculations. The resulting running coupling possesses an infrared fixed point, for all gauge groups SU(). Above one GeV the running coupling rapidly approaches its perturbative form.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research