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. 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

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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
Issue number1
StatePublished - 2003

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