Infrared behavior and fixed points in Landau-gauge QCD.
We investigate the infrared behavior of gluon and ghost propagators in Landau-gauge QCD by means of an exact renormalization group equation. We explain how, in general, the infrared momentum structure of Green functions can be extracted within this approach. An optimization procedure is devised to remove residual regulator dependences. In Landau-gauge QCD this framework is used to determine the infrared leading terms of the propagators. The results support the Kugo-Ojima confinement scenario. Possible extensions are discussed.
Pawlowski
Jan M
JM
Institut für Theoretische Physik III, Universität Erlangen, Staudtstrasse 7, 91058 Erlangen, Germany.
Litim
Daniel F
DF
Nedelko
Sergei
S
von Smekal
Lorenz
L