Study of the decay lambda(c)+ ---> Lambda lepton+ lepton-neutrino

Using the CLEO II detector at CESR we observe pairs consistent with the semileptonic decay Λc+ → λ+ν We measure . Combining with the charm semileptonic width and the lifetime of the Λc we also obtain B(Λ+c → pK−π+). We find no evidence for final states in which there are additional Λ+c decay products. We measure the decay asymmetry parameter of Λ+c → Λe+νe to be αΛc = −0.89+0.17+0.09−0.11−0.05.