Lattice QCD, gauge fixing, and the transition to the perturbative regime

Details Lattice QCD, gauge fixing, and the transition to the perturbative regime Lattice QCD, gauge fixing, and the transition to the perturbative regime

2002-12-26

arxiv.org/abs/hep-lat/0212038v1

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages, Latex, 2 figures, uses ws-procs9x6, to appear in proceedings of Quark Confinement and the Hadron Spectrum V

Scientific paper

Perturbative QCD uses the Faddeev-Popov gauge-fixing procedure, which leads to ghosts and the local BRST invariance of the gauge-fixed perturbative QCD action. In the asymptotic regime, where perturbative QCD is relevant, Gribov copies can be neglected. In the nonperturbative regime, one must adopt either a nonlocal Gribov-copy free gauge (e.g., Laplacian gauge) or attempt to maintain local BRST invariance at the expense of admitting Gribov copies. These issues are explored and discussed. In addition, the relationship between recent Dyson-Schwinger based calculations of the infrared behavior of QCD Green's functions and the lattice calculation of these quantities is examined.

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