BARYONS, THEIR INTERACTIONS AND THE CHIRAL-SYMMETRY OF QCD

An implication of the spontaneous chiral symmetry breaking in QCD is t hat at low energy and resolution there appear quasiparticles--constitu ent quarks and Goldstone bosons. Thus, light and strange baryons shoul d be considered as systems of three constituent quarks with confining interaction and a chiral interaction that is mediated by Goldstone bos ons between the constituent quarks. We show how the flavor-spin struct ure and sign of the short-range part of the Goldstone boson exchange i nteraction reduces the SU(6)(FS) symmetry down to SU(3)(F) x SU(2)(s), induces hyperfine splittings and provides correct ordering of the low est states with positive and negative parity. We present a unified des cription of light and strange baryon spectra calculated in a semirelat ivistic framework. It is demonstrated that the same short-range part o f the Goldstone boson exchange also induces strong short-range repulsi on in NN system when the latter is treated as 6Q system. Thus, all the main ingredients in NN interaction are implied by the chiral constitu ent quark model since the long- and intermediate-range attraction appe ars in the present framework due to pion and correlated two-pion excha nges between quarks belonging to different nucleons. We also find a ve ry strong short-range repulsion in Lambda Lambda system with J(P)=0(+) . It then suggests that the compact H-particle should not exist.