The New Sigma_b multiplet, heavy baryon mass predictions, meson-baryon universality and magnetic moments of Lambda_c and Lambda_b

摘要

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