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Gauge Invariant Quark Propagator in the Instanton Background

After a general discussion on the choice of gauge, we compare the quark propagator in the background of one instanton in regular and singular gauge with a gauge invariant propagator obtained by inserting a path-ordered gluon exponential. Using a gauge motivated by this analysis, we were able to obtain a finite result for the quark condensate without introducing an infrared cutoff nor invoking some instanton model.

preprint1995arXivOpen access
Marcus Hutter
hep-ph
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Marcus Hutter

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