Semi-leptonic decays of charmed baryons

Estimates of semi-leptonic decays of the charmed 1/2+ baryons, members of the SU(3) 3* and 6 multiplets, into ordinary 1/2+ baryons are presented. General expressions for decay rates and the mass M(B+l) spectra are given. The relevant form factors for the 1/2+→1/2+ transitions to the electromagnetic ones are related by means of CVC and SU(4). The form factors for 1/2+ transitions are related through SU(4) to those measured in Δ production. The dependence of the results on the masses of charmed baryons is discussed. The 1/2+→1/2+ and 1/2+→3/2+ transitions turn out to be dominant for the decays of the multiplets 3* and 6, respectively. The partial lifetimes are O(10-10-10-14)sec as the masses of the decaying baryons are varied from 2 to 2.9 GeV. Possible ways of getting an idea about the masses of the charmed baryons are given. (Auth)