Abstract
The interest in constituent quark models (CQMs) is largely motivated by the hope that they might provide an effective approach to low-energy hadronic physics. Thus, in the attempt of constructing a CQM one has first to determine the essential properties of low-energy quantum chromodynamics (QCD) and then to find suitable ways of implementing them into the model. At present we have reasonable confidence that low-energy QCD is mainly driven by the spontaneous breaking of chiral symmetry (SBxS). As a result the original degrees of freedom of QCD (current quarks and gluons) get changed when proceeding to low energies. There is increasing evidence, especially also from lattice QCD1, that the assumption of constituent quarks as low-energy quasiparticles is well substantiated. There is also a residual SU(3) symmetry left from SBxS. It is associated with the appearance of Goldstone bosons213. Therefore it is tempting to assume that low-energy QCD is governed by constituent quarks and Goldstone bosons as the essential degrees of freedom4.
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