Observation of an excited charmed baryon decaying into Ξ0 c π+

L. Gibbons, S. D. Johnson, Y. Kwon, S. Roberts, E. H. Thorndike, C. P. Jessop, K. Lingel, H. Marsiske, M. L. Perl, S. F. Schaffner, R. Wang, T. E. Coan, J. Dominick, V. Fadeyev, I. Korolkov, M. Lambrecht, S. Sanghera, V. Shelkov, R. Stroynowski, I. VolobouevG. Wei, M. Artuso, A. Efimov, M. Gao, M. Goldberg, D. He, N. Horwitz, S. Kopp, G. C. Moneti, R. Mountain, Y. Mukhin, S. Playfer, T. Skwarnicki, S. Stone, X. Xing, J. Bartelt, S. E. Csorna, V. Jain, S. Marka, A. Freyberger, D. Gibaut, K. Kinoshita, P. Pomianowski, S. Schrenk, D. Cinabro, B. Barish, M. Chadha, S. Chan, Y. Kubota, R. Poling, CLEO Collaboration

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Using data recorded by the CLEO II detector at the Cornell Electron Storage Ring, we report the first observation of an excited charmed baryon decaying into Ξ0 cπ+. The state has mass difference M\(Ξ0 cπ+)-M(Ξ0 c\) of 174.3+/-0.5+/-1.0 MeV/c2, and a width of < 3.1 MeV/c2 (90% confidence level limit). We identify the new state as the Ξ*+ c, the isospin partner of the recently discovered Ξ*+ c.

Original languageEnglish (US)
Pages (from-to)810-813
Number of pages4
JournalPhysical review letters
Issue number5
StatePublished - 1996

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