  The recent measurement by CDF M(Sigma_b)-M(Lambda_b)=192 MeV is in striking
agreement with our theoretical prediction M(Sigma_b)-M(Lambda_b) = 194 MeV. In
addition, the measured splitting M(Sigma_b*)-M(Sigma_b) = 21 MeV agrees well
with the predicted splitting of 22 MeV. We point out the connection between
these predictions and an effective supersymmetry between mesons and baryons
related by replacing a light antiquark by a light diquark. We discuss the
theoretical framework behind these predictions and use it to provide additional
predictions for the masses of spin-1/2 and spin-3/2 baryons containing heavy
quarks, as well as magnetic moments of Lambda_b and Lambda_c.
