Abstract
We study dynamical chiral-symmetry breaking of non-perturbative QCD in the dual Ginzburg-Landau theory, where the QCD-monopole field is introduced as an essential field for color confinement stemming from the choice of the abelian gauge fixing a la 't Hooft. In this theory, QCD-monopole condensation causes the dual Meissner effect, which changes the gluon propagator. The dynamical chiral-symmetry breaking is investigated using the Schwinger-Dyson equation with the modified gluon propagator in the QCD-monopole condensed vacuum. We introduce the low momentum cutoff on the modified gluon propagator by considering the effects of the pair creation and/or the quarks being confined in hadrons. We find that dynamical chiral-symmetry breaking is largely enhanced by QCD-monopole condensation, which suggests the close relation between the color confinement and the chiral symmetry breaking. The dynamical quark mass, the pion decay constant and the quark condensate are reproduced consistently with the confining mechanism in this theory.
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