Observation of two excited charmed baryons decaying into Λ+cπ±

G. Brandenburg, R. A. Briere, D. Y J Kim, T. Liu, M. Saulnier, R. Wilson, H. Yamamoto, T. E. Browder, F. Li, Y. Li, J. L. Rodriguez, T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, E. Johnson, I. Karliner, M. Palmer, M. SelenJ. J. Thaler, K. W. Edwards, A. Bellerive, D. I. Britton, R. Janicek, D. B. MacFarlane, K. W. McLean, P. M. Patel, A. J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, C. Darling, R. Davis, N. Hancock, S. Kotov, I. Kravchenko, N. Kwak, S. Anderson, Y. Kubota, M. Lattery, J. J. O'Neill, S. Patton, R. Poling, T. Riehle, A. Smith, V. Savinov, M. S. Alam, S. B. Athar, Z. Ling, A. H. Mahmood, H. Severini, S. Timm, F. Wappler, A. Anastassov, S. Blinov, J. E. Duboscq, R. Fulton, D. Fujino, K. K. Gan, T. Hart, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. Sung, A. Undrus, R. Wanke, A. Wolf, M. M. Zoeller, B. Nemati, S. J. Richichi, W. R. Ross, P. Skubic, M. Wood, M. Bishai, J. Fast, E. Gerndt, J. W. Hinson, D. H. Miller, E. I. Shibata, I. P J Shipsey, M. Yurko, 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, D. Ugolini, R. Wang, X. Zhou

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Using data recorded by the CLEO-II detector at CESR, we report evidence of a pair of excited charmed baryons, one decaying into λ+cπ+and the other into λ+cπ-. The doubly charged state has a measured mass difference M(λ+cπ+)- M(λ+c) of 234.5 ± 1.1 ± 0.8 MeV/c2and a width of 17.9+3.8-3.2± 4.0 MeV/c2, and the neutral state has a measured mass difference M (λ+cπ+)-M (λ+c) of 232.6 ± 1.0 ± 0.8 MeV/c2and a width of 13.0-3.0+3.7± 4.0 MeV/c2. We interpret these data as evidence of the Σ*++cand Σ*0cthe spin 3/2+excitations of the Σcbaryons.

Original languageEnglish (US)
Pages (from-to)2304-2308
Number of pages5
JournalPhysical review letters
Issue number12
StatePublished - 1997

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