Scaling behavior and positivity violation of the gluon propagator in full QCD

Details Scaling behavior and positivity violation of the gluon propagator in full QCD Scaling behavior and positivity violation of the gluon propagator in full QCD

2007-03-23

arxiv.org/abs/hep-lat/0703022v2

Phys.Rev.D76:094505,2007

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 9 figures. References and 1 figure added, minor text modifications, version to be published in PRD

Scientific paper

10.1103/PhysRevD.76.094505

The Landau-gauge gluon propagator is studied using the coarse and fine dynamical MILC configurations. The effects of dynamical quarks are clearly visible and lead to a reduction of the nonperturbative infrared enhancement relative to the quenched case. Lattice spacing effects are studied and found to be small. The gluon spectral function is shown to clearly violate positivity in both quenched and full QCD.

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