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Self consistent propagation of hyperons and antikaons in nuclear matter based on relativistic chiral SU(3) dynamics | | M.F.M. Lutz
; C.L. Korpa
; | | Date: |
28 May 2001 | | Journal: | Nucl.Phys. A700 (2002) 309-329 | | Subject: | nucl-th | | Affiliation: | GSI, Darmstadt) and C.L. Korpa (University of Pecs, Pecs | | 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 where a maximally scheme-independent formulation is derived 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 $Lambda(1405)$, $Sigma (1385)$ and $Lambda(1520)$ 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 $Lambda(1405)$, 70 MeV for the p-wave $Sigma (1385)$ and 90 MeV for the d-wave $Lambda(1520)$ resonance. | | Source: | arXiv, nucl-th/0105067 | | Services: | Forum | Review | PDF | Favorites | |
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