Phys. Rev. Lett.
74,
3331–3335
(1995)
Observation of Excited Charmed Baryon States Decaying to Λc+π+π-
K. W. Edwards et al. CLEO Collaboration
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K. W. Edwards1, M. Ogg1, A. Bellerive2, D. I. Britton2, E. R. F. Hyatt2, D. B. MacFarlane2, P. M. Patel2, B. Spaan2, A. J. Sadoff3, R. Ammar4, P. Baringer4, A. Bean4, D. Besson4, D. Coppage4, N. Copty4, R. Davis4, N. Hancock4, M. Kelly4, S. Kotov4, I. Kravchenko4, N. Kwak4, H. Lam4, Y. Kubota5, M. Lattery5, M. Momayezi5, J. K. Nelson5, S. Patton5, R. Poling5, V. Savinov5, S. Schrenk5, R. Wang5, M. S. Alam6, I. J. Kim6, Z. Ling6, A. H. Mahmood6, J. J. O'Neill6, H. Severini6, C. R. Sun6, F. Wappler6, G. Crawford7, C. M. Daubenmier7, R. Fulton7, D. Fujino7, K. K. Gan7, K. Honscheid7, H. Kagan7, R. Kass7, J. Lee7, M. Sung7, C. White7, A. Wolf7, M. M. Zoeller7, F. Butler8, X. Fu8, B. Nemati8, W. R. Ross8, P. Skubic8, M. Wood8, M. Bishai9, J. Fast9, E. Gerndt9, J. W. Hinson9, R. L. McIlwain9, T. Miao9, D. H. Miller9, M. Modesitt9, D. Payne9, E. I. Shibata9, I. P. J. Shipsey9, P. N. Wang9, M. Battle10, J. Ernst10, L. Gibbons10, Y. Kwon10, S. Roberts10, E. H. Thorndike10, C. H. Wang10, J. Dominick11, M. Lambrecht11, S. Sanghera11, V. Shelkov11, T. Skwarnicki11, R. Stroynowski11, I. Volobouev11, G. Wei11, P. Zadorozhny11, M. Artuso12, M. Gao12, M. Goldberg12, D. He12, N. Horwitz12, G. C. Moneti12, R. Mountain12, F. Muheim12, Y. Mukhin12, S. Playfer12, Y. Rozen12, S. Stone12, X. Xing12, G. Zhu12, J. Bartelt13, S. E. Csorna13, Z. Egyed13, V. Jain13, D. Gibaut14, K. Kinoshita14, P. Pomianowski14, B. Barish15, M. Chadha15, S. Chan15, D. F. Cowen15, G. Eigen15, J. S. Miller15, C. O'Grady15, J. Urheim15, A. J. Weinstein15, M. Athanas16, W. Brower16, G. Masek16, H. P. Paar16, J. Gronberg17, C. M. Korte17, R. Kutschke17, S. Menary17, R. J. Morrison17, S. Nakanishi17, H. N. Nelson17, T. K. Nelson17, C. Qiao17, J. D. Richman17, A. Ryd17, D. Sperka17, H. Tajima17, M. S. Witherell17, M. Procario18, R. Balest19, K. Cho19, W. T. Ford19, D. R. Johnson19, K. Lingel19, M. Lohner19, P. Rankin19, J. G. Smith19, J. P. Alexander20, C. Bebek20, K. Berkelman20, K. Bloom20, T. E. Browder20, D. G. Cassel20, H. A. Cho20, D. M. Coffman20, D. S. Crowcroft20, P. S. Drell20, D. J. Dumas20, R. Ehrlich20, P. Gaidarev20, M. Garcia-Sciveres20, B. Geiser20, B. Gittelman20, S. W. Gray20, D. L. Hartill20, B. K. Heltsley20, S. Henderson20, C. D. Jones20, S. L. Jones20, J. Kandaswamy20, N. Katayama20, P. C. Kim20, D. L. Kreinick20, G. S. Ludwig20, J. Masui20, J. Mevissen20, N. B. Mistry20, C. R. Ng20, E. Nordberg20, J. R. Patterson20, D. Peterson20, D. Riley20, S. Salman20, M. Sapper20, F. Würthwein20, P. Avery21, A. Freyberger21, J. Rodriguez21, S. Yang21, J. Yelton21, D. Cinabro22, T. Liu22, M. Saulnier22, R. Wilson22, H. Yamamoto22, T. Bergfeld23, B. I. Eisenstein23, G. Gollin23, B. Ong23, M. Palmer23, M. Selen23, and J. J. Thaler23 (CLEO Collaboration)
1Carleton University, Ottawa, Ontario, Canada K1S 5B6 and
the Institute of Particle Physics, Montréal, Canada
2McGill University, Montréal, Québec, Canada H3A 2T8 and
the Institute of Particle Physics, Montréal, Canada
3Ithaca College, Ithaca, New York 14850
4University of Kansas, Lawrence, Kansas 66045
5University of Minnesota, Minneapolis, Minnesota 55455
6State University of New York at Albany, Albany, New York 12222
7The Ohio State University, Columbus, Ohio 43210
8University of Oklahoma, Norman, Oklahoma 73019
9Purdue University, West Lafayette, Indiana 47907
10University of Rochester, Rochester, New York 14627
11Southern Methodist University, Dallas, Texas 75275
12Syracuse University, Syracuse, New York 13244
13Vanderbilt University, Nashville, Tennessee 37235
14Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
15California Institute of Technology, Pasadena, California 91125
16University of California, San Diego, La Jolla, California 92093
17University of California, Santa Barbara, California 93106
18Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
19University of Colorado, Boulder, Colorado 80309-0390
20Cornell University, Ithaca, New York 14853
21University of Florida, Gainesville, Florida 32611
22Harvard University, Cambridge, Massachusetts 02138
23University of Illinois, Champaign-Urbana, Illinois 61801
Received 21 November 1994; published in the issue dated 24 April 1995
Using data collected by the CLEO II detector, we have observed two states decaying to Λc+π+π-. Relative to the Λc+, their mass splittings are measured to be +307.5±0.4±1.0 and +342.2±0.2±0.5MeV/c2, respectively; this represents the first measurement of the less massive state. These two states are consistent with being orbitally excited, isospin zero Λc+ states.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.3331
DOI:
10.1103/PhysRevLett.74.3331
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