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HK: Physik der Hadronen und Kerne

HK 6: Theory II

HK 6.7: Talk

Monday, March 8, 2004, 17:45–18:00, E

Hyperon-nucleon Dirac-Brueckner calculations — •Christoph Keil and Horst Lenske — Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany

We present a model for the calculation of relativistic effective in-medium interactions for NN and YN scattering. The model is based on the covariant meson exchange formalism of the Bonn potentials which are extended to also include the octet hyperons as well as the lowest three meson octets, accounting for pseudoscalar, vector and scalar interactions. The decomposition of the G-matrix, for which we have to use an enlarged set of invariants, is discussed. For the decomposition also the half off-shell amplitudes are utilized which removes the ambiguities in this process. We will present first results for the application of our effective Λ-N interaction to single Λ hypernuclei calculated in the density dependent relativistic hadron field theory DDRH.
Work supported by the European graduate school Giessen–Copenhagen.