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Relativistic mean-field theory with $\delta$ meson, nonlinear isoscalarself-interactions and isoscalar-isovector cross interaction terms withparametrizations obtained to reproduce Dirac-Brueckner-Hartree-Fockcalculations for nuclear matter is used to study asymmetric nuclear matterproperties in $\beta$-equilibrium, including hyperon degrees of freedom and(hidden) strange mesons. Influence of cross interaction on composition ofhyperon matter and electron chemical potential is examined. Softening ofnuclear equation of state by the cross interactions results in lowering ofhyperonization, although simultaneously enhancing a hyperon-induced decrease ofthe electron chemical potential, thus indicating further shift of a kaoncondensate occurence to higher densities.Comment: 11 pages, 7 figures, 3 tables, published in Phys. Rev.

Hyperons in a relativistic mean-field approach to asymmetric nuclear matter