Foundations of the Constituent Quark Model

Details Foundations of the Constituent Quark Model Foundations of the Constituent Quark Model

1996-03-17

arxiv.org/abs/nucl-th/9603023v1

Prog.Part.Nucl.Phys.36:1-18,1996

Physics

Nuclear Physics

Nuclear Theory

Lecture at the International School of Nuclear Physics, September 19 -- 27, 1995, Erice, Italy. 17 p. LaTeX, to be published i

Scientific paper

10.1016/0146-6410(96)00003-8

'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 constitutent 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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