NUCLEON SPIN-FLAVOR STRUCTURE IN THE SU(3)-BREAKING CHIRAL QUARK-MODEL

The SU(3) symmetric chiral quark model, which describes interactions b etween quarks, gluons, and the Goldstone bosons, explains reasonably w ell many aspects of the flavor and spin structure of the proton, excep t for the values of f(3)/f(8) and Delta(3)/Delta(8). Introducing the S U(3)-breaking effect suggested by the mass difference between the stra nge and nonstrange quarks, we find that this discrepancy can be remove d and better overall agreement obtained.