Abstract
A Nambu-Jona-Lasinio (NJL) effective theory is used to demonstrate how a comparison of current quark masses obtained from hadronic physics and "effective" current quark masses, defined to be the difference between constituent masses characterizing hadronic spectroscopy and the chiral-limiting dynamical quark mass, can provide insight into the strong-coupling regime of QCD. A phenomenologically reasonable enhancement of effective current quark masses relative to actual current quark masses is shown to be indicative of near-criticality of the NJL coupling constant.
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