Eur. Phys. J. A (2007) 33: 287-290
https://doi.org/10.1140/epja/i2007-10467-5

HYP 2006

Meson exchange hyperon-nucleon interaction based on correlated ππ/K¯ exchange

Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany

^* e-mail: j.haidenbauer@fz-juelich.de

Received: 28 February 2007
Accepted: 7 July 2007
Published online: 31 August 2007

Abstract

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.