Journal
PHYSICS LETTERS B
Volume 611, Issue 3-4, Pages 279-288Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2005.02.043
Keywords
confinement; universality; norperturbative QCD; running coupling; Dyson-Schwinger equations; infrared behaviour
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The infrared behaviour of vertex functions in an SU(N) Yang-Mills theory in Landau gauge is investigated employing a skeleton expansion of the Dyson-Schwinger equations. The three- and four-gluon vertices become singular if and only if all external momenta vanish while the dressing of the ghost-gluon vertex remains finite in this limit. The running coupling as extracted from either of these vertex functions possesses an infrared fixed point. In general, diagrams including ghost-loops dominate in the infrared over purely gluonic ones. (c) 2005 Elsevier B.V. All rights reserved.
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