Semi-leptonic decays of charmed baryons

We present estimates of semi-leptonic decays of the charmed 1+ 2 baryons, members of the SU(3) 3^* and 6 multiplets, into ordinary 1+ 2 and 3+ 2 baryons. We give general expressions for decay rates and the mass M(B⁺ℓ) spectra. We relate the relevant form factors for the 1+ 2 → 1+ 2 transitions to the electromagnetic ones by means of CVC and SU(4). The form factors for 1+ 2 → 3+ 2 transitions are related through SU(4) to those measured in Δ production. We discuss the dependence of the results on the masses of charmed baryons. 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.