Phys. Rev. Lett. 71, 3259 - 3262 (1993)
Observation of the charmed baryon Σc+ and measurement of the isospin mass splittings of the Σc
G. Crawford et al.
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G. Crawford, C. M. Daubenmier, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, R. Malchow, F. Morrow, Y. Skovpen, M. Sung, C. White, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbfleisch, M. Lambrecht, W. R. Ross, P. Skubic, J. Snow, P. L. Wang, M. Wood, D. Bortoletto, D. N. Brown, J. Fast, R. L. McIlwain, T. Miao, D. H. Miller, M. Modesitt, S. F. Schaffner, E. I. Shibata, I. P. J. Shipsey, P. N. Wang, M. Battle, J. Ernst, H. Kroha, S. Roberts, K. Sparks, E. H. Thorndike, C. H. Wang, J. Dominick, S. Sanghera, T. Skwarnicki, R. Stoynowski, M. Artuso, D. He, M. Goldberg, N. Horwitz, R. Kennett, G. C. Moneti, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, G. Zhu, J. Bartelt, S. E. Csorna, Z. Egyed, V. Jain, P. Sheldon, D. S. Akerib, B. Barish, M. Chadha, S. Chan, D. F. Cowen, G. Eigen, J. S. Miller, C. O’Grady, J. Urheim, A. J. Weinstein, D. Acosta, M. Athanas, G. Masek, B. Ong, H. Paar, M. Sivertz, A. Bean, J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson, T. K. Nelson, J. D. Richman, A. Ryd, H. Tajima, D. Schmidt, D. Sperka, M. S. Witherell, M. Procario, S. Yang, R. Balest, K. Cho, M. Daoudi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, J. G. Smith, J. P. Alexander, C. Bebek, K. Berkelman, D. Besson, T. E. Browder, D. G. Cassel, H. A. Cho, D. M. Coffman, P. S. Drell, R. Ehrlich, R. S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, C. D. Jones, S. L. Jones, J. Kandaswamy, N. Katayama, P. C. Kim, D. L. Kreinick, G. S. Ludwig, J. Masui, J. Mevissen, N. B. Mistry, C. R. Ng, E. Nordberg, M. Ogg, J. R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, H. Worden, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, R. Stephens, J. Yelton, D. Cinabro, S. Henderson, K. Kinoshita, T. Liu, M. Saulnier, F. Shen, R. Wilson, H. Yamamoto, M. Selen, A. J. Sadoff, R. Ammar, S. Ball, P. Baringer, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, N. Kwak, H. Lam, Y. Kubota, M. Lattery, J. K. Nelson, S. Patton, D. Perticone, R. Poling, V. Savinov, S. Schrenk, R. Wang, M. S. Alam, I. J. Kim, B. Nemati, J. J. O’Neill, H. Severini, C. R. Sun, and M. M. Zoeller
Ohio State University, Columbus, Ohio 43210
University of Oklahoma, Norman, Oklahoma 73019
Perdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
Southern Methodist University, Dallas, Texas 75275
Syracuse University, Syracuse, New York 13244
Vanderbilt University, Nashville, Tennessee 37235
California Institute of Technology, Pasadena, California 91125
University of California, San Diego, La Jolla, California 92093
University of California–Santa Barbara, Santa Barbara, California 93106
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
University of Colorado, Boulder, Colorado 80309-0390
Cornell University, Ithaca, New York 14853
University of Florida, Gainesville, Florida 32611
Harvard University, Cambridge, Massachusetts 02138
University of Illinois, Urbana-Champaign, Urbana Illiniois 61801
Ithaca College, Ithaca, New York 14850
University of Kansas, Lawrence, Kansas 66045
University of Minnesota, Minneapolis, Minnesota 55455
State University of New York at Albany, Albany, New York 12222
Received 24 June 1993
We observe the Σc+ baryon decaying to Λc+π0 and measure the mass difference M(Σc+)-M(Λc+) to be 168.5±0.2 MeV/c2. We also measure the mass differences M(Σc++)-M(Λc+) and M(Σc0-M(Λc+) with improved precision and determine the isospin mass splittings M(Σc++)-M(Σc0) and M(Σc+)-M(Σc0) to be 1.1±0.4±0.1 MeV/c2 and 1.4±0.5±0.3 MeV/c2, respectively. Our results indicate that the light quark mass difference does not dominate the isospin mass splitting in Σc.
©1993 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.71.3259
DOI: 10.1103/PhysRevLett.71.3259
PACS: 14.20.Kp, 13.30.Eg, 13.40.Dk, 13.65.+i
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