First observation of the exclusive decays Λc + → Λπ+π+π-π0 and Λc + → Λωπ+

D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, R. Stroynowski, Marina Artuso, C. Boulahouache, Steven Roy Blusk, K. Bukin, E. Dambasuren, R. Mountain, G. C. Moneti, H. Muramatsu, R. NandakumarTomasz Skwarnicki, Sheldon Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Krüger, T. O. Meyer, N. B. Mistry, E. Nordberg, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, T. Wilksen, A. Warburton, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, R. Ammar, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, F. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, T. Hart, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, M. M. Zoeller, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, S. Chen, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, E. I. Shibata, I. P J Shipsey

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Abstract

Using data collected by the CLEO III detector at CESR, we report on the first observation of the decays Λc + → Λπ+π+π-π0 and Λc + → Λωπ+. The branching fractions are measured relative to the pK-π+ mode; we find Β(Λc + → Λπ+π+π- π0)/Β(Λc + → pK-π+ = 0.36±0.09(stat)±0.09(syst) and Β(Λc + → Λωπ+)/Β(Λc + → pK-π+) = 0.24±0.06(stat)±0.06(syst). We also observe a small excess of events in Λc + → Ληπ+, η → π+π-π0 from which we find Β(Λc + → Ληπ+)/Β(Λc + → pK-π+) = 0.41±0.17±0.10 with a corresponding limit of <0.65% at 90% confidence level. This rate is consistent with previous measurements of Λc + → Ληπ+, η → γγ. We find that the combined branching fractions for Λc + → Λωπ+ and Λc + → ηπ+ comprise (87±13)% of the total Λc + → Λπ+π+π-π0 rate. We set an upper limit on Β(Λc + → Λπ+π+π-π 0)/Β(Λc + → pK-π+) for non-ω and non-η modes of 0.13 at 90% confidence level.

Original languageEnglish (US)
Article number012001
Pages (from-to)120011-120017
Number of pages7
JournalPhysical Review D
Volume67
Issue number1
StatePublished - Jan 1 2003

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Cronin-Hennessy, D., Lyon, A. L., Park, C. S., Park, W., Thayer, J. B., Thorndike, E. H., Coan, T. E., Gao, Y. S., Liu, F., Maravin, Y., Stroynowski, R., Artuso, M., Boulahouache, C., Blusk, S. R., Bukin, K., Dambasuren, E., Mountain, R., Moneti, G. C., Muramatsu, H., ... Shipsey, I. P. J. (2003). First observation of the exclusive decays Λc + → Λπ+π+π-π0 and Λc + → Λωπ+ Physical Review D, 67(1), 120011-120017. [012001].