Multidimensional resonance analysis of Λ(c)/+ → pK- π+

E. M. Aitala*, S. Amato, J. C. Anjos, J. A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S. B. Bracker, P. R. Burchat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


We present the results of a five-dimensional resonant amplitude analysis of the Λ(c)/+ → pK- π+ system based on 946 ± 38 reconstructed decays. These data were produced in 500 GeV/c π-N interactions by Fermilab experiment E791. We report measurements of the amplitudes for Λ(c)/+ decay into nonresonant pK-π+ and to pK̄*0(890), Δ++(1232)K-, and Λ(1520)π+ and we comment on other possible resonant enhancements. This is the first complete amplitude analysis of the Λ(c)/+ → pK-π+ system. We find that (54.8 ± 5.5 ± 3.5)% of the decays are nonresonant, (19.5 ± 2.6 ± 1.8)% of the decays are via the K̄*(0) resonance, (18.0 ± 2.9 ± 2.9)% of the decays are via the Δ++ resonance, and (7.7 ± 1.8 ± 1.1)% of the decays are via the Λ(1520) resonance. We find evidence for an increasingly negative polarization of the Λ(c)/+ baryons as a function of p(T)/2, in agreement with a recent model [W.G.D. Dharmaratna, G.R. Goldstein, Phys. Rev. D 53 (1996) 1073; G.R. Goldstein, hep-ph/9907573] and with a related measurement [M. Jezabek, K. Rybicki, R. Rylko, Phys. Lett. B 286 (1992) 175]. (C) 2000 Published by Elsevier Science B.V.

Original languageEnglish
Pages (from-to)449-459
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
StatePublished - 6 Jan 2000
Externally publishedYes


FundersFunder number
Conselho Nacional de Desenvolvimento Cientı́fico e Technológio
Israeli Academy of Sciences and Humanities
Mexican Consejo Nacional de Ciencia y Tecnologica
US Department of Energy
US National Science Foundation
US-Israel Binational Science Foundation
United States Department of Energy
Universities Research Association, Inc.


    • Multidimensional
    • Polarization
    • Resonance
    • Λ(c)


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