The Hyperon-Nucleon Interaction: Conventional Versus Effective Field Theory Approach

Hyperon-nucleon interactions are presented that are derived either in the conventional meson-exchange picture or within leading order chiral effective field theory. The chiral potential consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon contact terms. With regard to meson-exchange YN models we focus on the new potential of the Jülich group, whose most salient feature is that the contributions in the scalar-isoscalar (σ) and vector-isovector (ϱ) exchange channels are constrained by a microscopic model of correlated ππ and KK exchange.