Antikaons and hyperons in nuclear matter with saturation

M. F M Lutz, C. Korpa, M. Möller

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We evaluate the antikaon and hyperon spectral functions in a self-consistent and covariant many-body approach. The computation is based on coupled-channel dynamics derived from the chiral SU(3) Lagrangian. A novel subtraction scheme is developed that avoids kinematical singularities and medium-induced power divergencies all together. Scalar and vector mean fields are used to model nuclear binding and saturation. The effect of the latter is striking for the antikaon spectral function that becomes significantly more narrow at small momenta. Attractive mass shifts of about 30 and 40 MeV are predicted for the Λ (1405) and Σ (1385) resonances. Once scalar and vector mean fields for the nucleon are switched on the Λ (1520) resonance dissolves almost completely in nuclear matter. All together only moderate attraction is predicted for the nuclear antikaon systems at saturation density. However, at larger densities we predict a sizable population of soft antikaon modes that arise from the coupling of the antikaon to a highly collective Λ (1115) nucleon-hole state. This may lead to the formation of exotic nuclear systems with strangeness and antikaon condensation in compact stars at moderate densities.

Original languageEnglish
Pages (from-to)124-159
Number of pages36
JournalNuclear Physics A
Volume808
Issue number1-4
DOIs
Publication statusPublished - Aug 1 2008

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hyperons
saturation
scalars
nuclear models
strangeness
subtraction
attraction
condensation
momentum
stars
shift

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Antikaons and hyperons in nuclear matter with saturation. / Lutz, M. F M; Korpa, C.; Möller, M.

In: Nuclear Physics A, Vol. 808, No. 1-4, 01.08.2008, p. 124-159.

Research output: Contribution to journalArticle

Lutz, M. F M ; Korpa, C. ; Möller, M. / Antikaons and hyperons in nuclear matter with saturation. In: Nuclear Physics A. 2008 ; Vol. 808, No. 1-4. pp. 124-159.
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