Violations of SU(6) selection rules from quark hyperfine interactions

The decay amplitudes for D15 → pγ, the amplitude for D05 → K-barN, and the charge radius of the neutron are zero in the SU(6) limit, but are observed to be nonzero. We show that all of these SU(6) -violating effects can be understood quantitatively in terms of the admixtures of excited-state configurations in the nucleon expected on the basis of color hyperfine interactions. In particular, the admixture of 2S/sub M/ (i.e., [70,0+]) with an amplitude of about - 1/4 is central to understanding all three effects