Observation of an Excited Charmed Baryon Decaying intoΞc0π+

Using data recorded by the CLEO-II detector at CESR, they report the first observation of an excited charmed baryon decaying into {Xi}{sub c}{sup 0}{pi}{sup +}. The state has mass difference M({Xi}{sub c}{sup 0}{pi}{sup +}) = M({Xi}{sub c}{sup 0}) of 174.3 {+-} 0.5 {+-} 1.0 MeV/c{sup 2}, and a width of < 3.1 MeV/c{sup 2} (90% confidence level limit). They identify the new state as the {Xi}*{sub c}{sup +}, the isospin partner of the recently discovered {Xi}*{sub c}{sup 0}.