Quark-quark correlations and baryon electroweak observables
  The simple independent quark models have difficulties explaining simultaneously the totality of the known hyperon magnetic moments and hyperon semi-leptonic decay rates. We show that both the Goldstone boson loop contributions and the two-quark effective exchange currents are essential in explaining these observables. 
H. Hogaasen, K. Kubodera and F. Myhrer