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QCD condensate contributions to the effective quark potential in a covariant gauge

We discuss QCD condensate contributions to the gluon propagator both in the fixed-point gauge and in covariant gauges for the external QCD vacuum gluon fields with the conclusion that a covariant gauge is essential to obtain a gauge invariant QCD vacuum energy density difference and to retain the unitarity of the quark scattering amplitude. The gauge-invariant QCD condensate contributions to the effective one-gluon exchange potential are evaluated by using the effective gluon propagator which produces a gauge-independent quark scattering amplitude.

preprint1999arXivOpen access
Ivan SchmidtJian-Jun Yang
hep-ph
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Ivan SchmidtJian-Jun Yang

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