First observation of the exclusive decays Λ c +→Λ π + π + π - π 0 and Λ c +Λ ωπ +

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, M. Artuso, C. Boulahouache, S. Blusk, K. Bukin, E. Dambasuren, R. Mountain, G. C. Moneti, H. Muramatsu, R. NandakumarT. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csoma, 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, Amiran Tomaradze, 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

*Corresponding author for this work

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6 Scopus citations

Abstract

Using data collected by the CLEO III detector at CESR, we report on the first observation of the decays Λ c +→Λ π + π + π - π 0 and Λ c +→Λ ωπ +. The branching fractions are measured relative to the pK - π + mode; we find B(Λ c +→Λ π + π + π - π 0)/B(Lambda; c +→pK - π +) = 0.36±0.09(stat) ±0.09(syst) and B(Λ c +→Λ ωπ +)/B(Λ c +→pK - π +) = 0.24±0.06(stat)±0.06(syst). We also observe a small excess of events in Λ c +→Λ ηπ +, η→π + π - π 0 from which we find B(Λ c +→Λ ηπ +)/B(Λ c +→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 Λ c +→Λ ηπ +, η-γ γ. We find that the combined branching fractions for Λ c +→Lambda; ωπ + and Λ c +→Λπ + π + π - π 0)B(Λ c + comprise (87±13) of the total Λ rate. We set an upper limit on B(Λ c +→Λπ + π + π - 0)/BΛ c +→pK - π + for non-ω and non-η modes of 0.13 at 90% confidence level.

Original languageEnglish (US)
Article number012001
JournalPhysical Review D
Volume67
Issue number1
DOIs
StatePublished - Dec 1 2003

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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