Observation of Two Excited Charmed Baryons Decaying into lambda(c)+ pi+-

Using data recorded by the CLEO-II detector at CESR, we report evidence of a pair of excited charmed baryons, one decaying into Λc+ π+ and the other into Λc+π-. The doubly charged state has a measured mass difference M(Λc+ π+) - M(Λc+) of 234.5 ± 1.1 ± 0.8 MeV and a width of 17.9-3.2+3.8 ± 4.0 MeV, and the neutral state has a measured mass difference M(Λc+π-) - M(Λc+) of 232.6 ± 1.0 ± 0.8 MeV and a width of 13.0-3.0+3.7 ± 4.0 MeV. We identify these states as Σ*c++ and Σ*c0, the spin 3/2+ excitations of the Σc baryons