Self-consistent propagation of hyperons and antikaons in nuclear matter based on relativistic chiral SU(3) dynamics

M. F.M. Lutz, C. L. Korpa

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

We evaluate the antikaon spectral density in isospin symmetric nuclear matter. The in-medium antikaon-nucleon scattering process and the antikaon propagation is treated in a self-consistent and relativistic manner by performing a partial density resummation in terms of the free-space antikaon-nucleon scattering amplitudes. The latter amplitudes are taken from a covariant and chiral coupled-channel SU (3) approach which includes s-, p- and d-waves systematically. Particular care is taken on the proper evaluation of the in-medium mixing of the partial waves. Our analysis establishes a rich structure of the antikaon spectral function with considerable strength at small energies. At nuclear saturation density we predict attractive mass shifts for the Λ (1405), ∑ (1385) and Λ (1520) of about 60 MeV, 60 MeV and 100 MeV, respectively. The hyperon states are found to exhibit at the same time an increased decay width of about 120 MeV for the s-wave Λ (1405), 70 MeV for the p-wave ∑ (1385) and 90 MeV for the d-wave Λ (1520) resonance.

Original languageEnglish
Pages (from-to)309-329
Number of pages21
JournalNuclear Physics A
Volume700
Issue number1-2
DOIs
Publication statusPublished - Mar 25 2002

Keywords

  • Bethe-Salpeter equation
  • Chiral pertubation theory
  • Coupled-channel theory
  • Kaon-nucleon interaction
  • Large number of colors
  • Pion-nucleon interaction

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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