Foundations of the Constituent Quark Model
نویسنده
چکیده
‘Constituent quarks’ means massive quarks, in contrast to the nearly massless u, d, s quarks of the QCD lagrangian. The dynamical or constituent masses appear owing to the spontaneous chiral symmetry breaking in QCD. A realistic mechanism of the chiral symmetry breaking is provided by instantons. Therefore, I review the present status of the QCD instanton vacuum, emphasizing the mechanism of chiral symmetry breaking and of the generation of the constituent quark mass. I end up with the Nambu–Jona-Lasinio-type effective theory to which QCD is reduced at low momenta.
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