Phys. Rev. Lett.
78,
2304–2308
(1997)
Observation of Two Excited Charmed Baryons Decaying into Λc+π±
G. Brandenburg et al. (CLEO Collaboration)
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G. Brandenburg1, R. A. Briere1, D. Y.-J. Kim1, T. Liu1, M. Saulnier1, R. Wilson1, H. Yamamoto1, T. E. Browder2, F. Li2, Y. Li2, J. L. Rodriguez2, T. Bergfeld3, B. I. Eisenstein3, J. Ernst3, G. E. Gladding3, G. D. Gollin3, E. Johnson3, I. Karliner3, M. Palmer3, M. Selen3, J. J. Thaler3, K. W. Edwards4, A. Bellerive5, D. I. Britton5, R. Janicek5, D. B. MacFarlane5, K. W. McLean5, P. M. Patel5, A. J. Sadoff6, R. Ammar7, P. Baringer7, A. Bean7, D. Besson7, D. Coppage7, C. Darling7, R. Davis7, N. Hancock7, S. Kotov7, I. Kravchenko7, N. Kwak7, S. Anderson8, Y. Kubota8, M. Lattery8, J. J. O'Neill8, S. Patton8, R. Poling8, T. Riehle8, A. Smith8, V. Savinov8, M. S. Alam9, S. B. Athar9, Z. Ling9, A. H. Mahmood9, H. Severini9, S. Timm9, F. Wappler9, A. Anastassov10, S. Blinov10, J. E. Duboscq10, R. Fulton10, D. Fujino10, K. K. Gan10, T. Hart10, K. Honscheid10, H. Kagan10, R. Kass10, J. Lee10, M. Sung10, A. Undrus10, R. Wanke10, A. Wolf10, M. M. Zoeller10, B. Nemati11, S. J. Richichi11, W. R. Ross11, P. Skubic11, M. Wood11, M. Bishai12, J. Fast12, E. Gerndt12, J. W. Hinson12, D. H. Miller12, E. I. Shibata12, I. P. J. Shipsey12, M. Yurko12, L. Gibbons13, S. D. Johnson13, Y. Kwon13, S. Roberts13, E. H. Thorndike13, C. P. Jessop14, K. Lingel14, H. Marsiske14, M. L. Perl14, S. F. Schaffner14, D. Ugolini14, R. Wang14, X. Zhou14, T. E. Coan15, V. Fadeyev15, I. Korolkov15, Y. Maravin15, I. Narsky15, V. Shelkov15, R. Stroynowski15, J. Staeck15, I. Volobouev15, J. Ye15, M. Artuso16, A. Efimov16, M. Gao16, M. Goldberg16, R. Greene16, F. Frasconi16, D. He16, S. Kopp16, G. C. Moneti16, R. Mountain16, Y. Mukhin16, S. Schuh16, T. Skwarnicki16, S. Stone16, X. Xing16, J. Bartelt17, S. E. Csorna17, V. Jain17, S. Marka17, A. Freyberger18, R. Godang18, D. Gibaut18, K. Kinoshita18, I. C. Lai18, P. Pomianowski18, S. Schrenk18, G. Bonvicini19, D. Cinabro19, L. Perera19, B. Barish20, M. Chadha20, S. Chan20, G. Eigen20, J. S. Miller20, C. O'Grady20, M. Schmidtler20, J. Urheim20, A. J. Weinstein20, F. Würthwein20, D. M. Asner21, D. W. Bliss21, W. S. Brower21, G. Masek21, H. P. Paar21, J. Gronberg22, C. M. Korte22, D. J. Lange22, R. Kutschke22, S. Menary22, R. J. Morrison22, S. Nakanishi22, H. N. Nelson22, T. K. Nelson22, C. Qiao22, J. D. Richman22, D. Roberts22, A. Ryd22, H. Tajima22, M. S. Witherell22, R. Balest23, B. H. Behrens23, K. Cho23, W. T. Ford23, H. Park23, P. Rankin23, J. Roy23, J. G. Smith23, J. P. Alexander24, C. Bebek24, B. E. Berger24, K. Berkelman24, K. Bloom24, D. G. Cassel24, H. A. Cho24, D. M. Coffman24, D. S. Crowcroft24, M. Dickson24, P. S. Drell24, R. Ehrlich24, R. Elia24, A. D. Foland24, P. Gaidarev24, B. Gittelman24, S. W. Gray24, D. L. Hartill24, B. K. Heltsley24, P. I. Hopman24, S. L. Jones24, J. Kandaswamy24, N. Katayama24, P. C. Kim24, D. L. Kreinick24, T. Lee24, Y. Liu24, G. S. Ludwig24, J. Masui24, J. Mevissen24, N. B. Mistry24, C. R. Ng24, E. Nordberg24, M. Ogg24, J. R. Patterson24, D. Peterson24, D. Riley24, A. Soffer24, C. Ward24, P. Avery24, M. Athanas25, C. D. Jones25, M. Lohner25, C. Prescott25, S. Yang25, J. Yelton25, and J. Zheng25 (CLEO Collaboration)
1Harvard University, Cambridge, Massachusetts 02138
2University of Hawaii at Manoa, Honolulu, Hawaii 96822
3University of Illinois, Champaign-Urbana, Illinois 61801
4Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
5McGill University, Montréal, Québec, Canada H3A 2T8 and the Institute of Particle Physics, Canada
6Ithaca College, Ithaca, New York 14850
7University of Kansas, Lawrence, Kansas 66045
8University of Minnesota, Minneapolis, Minnesota 55455
9State University of New York at Albany, Albany, New York 12222
10Ohio State University, Columbus, Ohio 43210
11University of Oklahoma, Norman, Oklahoma 73019
12Purdue University, West Lafayette, Indiana 47907
13University of Rochester, Rochester, New York 14627
14Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
15Southern Methodist University, Dallas, Texas 75275
16Syracuse University, Syracuse, New York 13244
17Vanderbilt University, Nashville, Tennessee 37235
18Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
19Wayne State University, Detroit, Michigan 48202
20California Institute of Technology, Pasadena, California 91125
21University of California, San Diego, La Jolla, California 92093
22University of California, Santa Barbara, California 93106
23University of Colorado, Boulder, Colorado 80309-0390
24Cornell University, Ithaca, New York 14853
25University of Florida, Gainesville, Florida 32611
Received 26 September 1996; published in the issue dated 24 March 1997
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/c2 and a width of 17.9-3.2+3.8±4.0 MeV/c2, and the neutral state has a measured mass difference M(Λc+π-)-M(Λc+) of 232.6±1.0±0.8 MeV/c2 and a width of 13.0-3.0+3.7±4.0 MeV/c2. We interpret these data as evidence of the Σc*++ and Σc*0, the spin 3/2+ excitations of the Σc baryons.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.2304
DOI:
10.1103/PhysRevLett.78.2304
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