The New Sigmab multiplet, heavy baryon mass predictions, meson-baryon universality and magnetic moments of Lambdac and Lambdab
Abstract
The recent measurement by CDF M(Sigmab)-M(Lambdab)=192 MeV is in striking agreement with our theoretical prediction M(Sigmab)-M(Lambdab) = 194 MeV. In addition, the measured splitting M(Sigmab*)-M(Sigmab) = 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 Lambdab and Lambdac.
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