Aspects of the confinement mechanism in Landau gauge QCD

Details Aspects of the confinement mechanism in Landau gauge QCD Aspects of the confinement mechanism in Landau gauge QCD

2008-11-21

arxiv.org/abs/0811.3608v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 10 figures

Scientific paper

I analyze the IR fixed point structure of Landau gauge QCD. Precisely the fixed point with a strong kinematic singularity of the quark-gluon vertex that proved crucial for the recently proposed confinement mechanism in the quenched approximation is absent in dynamical QCD. Therefore, the IR singularities do not induce asymptotic quark confinement but the long-range interaction is screened by unquenching loops at scales of the order of the quark mass. This provides the prerequisite for a microscopic description of deconfinement and string breaking. The fixed points determine the qualitative form of the heavy quark potential and may be relevant for hot and dense matter.

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