Meson exchange hyperon-nucleon interaction based on correlated ππ/K¯ exchange
Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany
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Accepted: 7 July 2007
Published online: 31 August 2007
We present a new model for the hyperon-nucleon (ΛN , ΣN interaction, derived within the meson exchange framework. The model incorporates the standard one-boson exchanges of the lowest pseudoscalar and vector meson multiplets with coupling constants fixed by SU(6) flavor symmetry relations. As a new feature, the contribution in the scalar-isoscalar (σ sector is derived from a microscopic model of correlated ππ and K¯ exchange. The same model is also used to constrain the interaction resulting from the vector-isovector (ρ exchange channel. Additional short-ranged ingredients of the model in the scalar-isovector (a0) and scalar-isospin-1/2 (κ channels are likewise viewed as arising from meson-meson correlations but are treated phenomenologically. With this model a satisfactory reproduction of the available hyperon-nucleon data is achieved.
PACS: 13.75.Ev Hyperon-nucleon interactions – / 21.30.-x Nuclear forces –
© Società Italiana di Fisica and Springer-Verlag, 2007