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 {Lambda}{sub c}{sup +} {pi}{sup +} and the other into {Lambda}{sub c}{sup +}{pi}{sup -}. The doubly charged state has a measured mass difference M({Lambda}{sub c}{sup +} {pi}{sup +}) - M({Lambda}{sub c}{sup +}) of 234.5 {+-} 1.1 {+-} 0.8 MeV and a width of 17.9{sub -3.2}{sup +3.8} {+-} 4.0 MeV, and the neutral state has a measured mass difference M({Lambda}{sub c}{sup +}{pi}{sup -}) - M({Lambda}{sub c}{sup +}) of 232.6 {+-} 1.0 {+-} 0.8 MeV and a width of 13.0{sub -3.0}{sup +3.7} {+-} 4.0 MeV. We identify these states as {Sigma}*{sub c}{sup ++} and {Sigma}*{sub c}{sup 0}, the spin 3/2{sup +} excitations of the {Sigma}{sub c} baryons.