Large N-c, constituent quarks, and N, Delta charge radii - art. no. 096005

We show how one may define baryon constituent quarks in a rigorous manner, given physical assumptions that hold in the large-N-c, limit of QCD. This c onstituent picture gives rise to an operator expansion that has been used t o study largeN(c), baryon observables; here we apply it to the case of char ge radii of the N and Delta states, using minimal dynamical assumptions. Fo r example, one finds the relation r(p)(2) - r(Delta+)(2) = r(n)(2) - r(Delt a0)(2) to be broken only by three-body, O(1/N-c(2)) effects for any N-c.