Meson exchange hyperon-nucleon interaction based on correlated pi pi/K(K)over-bar exchange

We present a new model for the hyperon-nucleon (Lambda N , Sigma N 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 (sigma sector is derived from a microscopic model of correlated pi pi and K (K) over bar exchange. The same model is also used to constrain the interaction resulting from the vector-isovector (rho exchange channel. Additional short-ranged ingredients of the model in the scalar-isovector (a(0)) and scalar-isospin-1/2 (kappa 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