Predictions for semileptonic decays of charm baryons. I. SU(4)-symmetry limit

We review the predictions of SU(4) symmetry and the Glashow-Iliopoulos-Maiani mechanism for the semileptonic decays of ${\mathrm{½}}^{+}$ charm baryons. We use, wherever possible, the experimental masses of charm baryons; for the unknown masses we use the predictions of mass formulas. The $q^2$ dependence of form factors is taken to be either of monopole or of dipole form. For $\Delta S=\Delta Q=-1\mathrm{}$ transitions, very large branching ratios are predicted—of the order of 10%.