Chiral quarks, chiral limit, nonanalytic terms and baryon spectroscopy

Abstract

It is shown that the principal pattern in baryon spectroscopy, which is associated with the flavor-spin dependent hyperfine interaction, is due to the spontaneous breaking of chiral symmetry in QCD and persists in the chiral limit. All corrections, which are associated with a finite quark (Goldstone boson) mass are suppressed by the factor $(\mu /{\Lambda }_{\chi }$)^2 and higher.

Comments: to appear in Phys. Lett. B, typos corrected, figure captions added, one sentence added