On-shell constraints for perturbative and nonperturbative quark masses in QCD

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Abstract
It is shown that the current, dynamical, and constituent quark masses, when anchored to the pole positions, are gauge-parameter independent both at the pole and in the deep-Euclidean region. The implications of theoretical and phenomenological quark-mass scales for chiral-symmetry breakdown and for the bridge between the relativistic theory of QCD and the nonrelativistic SU(6) quark model are discussed.