Author/Authors :
Fermilab E791 Collaboration، نويسنده , , E.M. Aitala، نويسنده , , S. Amato، نويسنده , , J.C. Anjos، نويسنده , , J.A. Appel، نويسنده , , D. Ashery، نويسنده , , S. Banerjee، نويسنده , , I. Bediaga، نويسنده , , G. Blaylock، نويسنده , , S.B. Bracker، نويسنده , , P.R. Burchat، نويسنده , , R.A. Burnstein، نويسنده , , T. Carter، نويسنده , , H.S. Carvalho، نويسنده , , N.K. Copty، نويسنده , , L.M. Cremaldi، نويسنده , , C. Darling، نويسنده , , K. Denisenko، نويسنده , , S. Devmal، نويسنده , , A. Fernandez، نويسنده , , et al.، نويسنده ,
Abstract :
We present the results of a five-dimensional resonant amplitude analysis of the Λc+→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 Λc+ decay into nonresonant pK−π+ and to pK∗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 Λc+→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 K∗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 Λc+ baryons as a function of pT2, 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].
