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

Abstract

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 hyperon-nucleon 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.

Baryon-baryon interactions from Effective Field Theory

“…[13], [15] and [17]. The LO potential consists of four-baryon contact terms without derivatives and of one-pseudoscalar-meson exchanges.…”

Exotic nuclear matter

“…Various kinds of SU(3) based models for the octet baryons have been formulated and are actively worked on [26][27][28]. In our one boson exchange (OBE) approach we are especially interested in a unified description of interactions in free space and in nuclear matter with the long-term perspective of formulating a SU(3) density functional theory on the line of [17,20].…”

Hyperon–Nucleon Interaction in Chiral Effective Field Theory

“…[2]. Calculations for the four-body hypernuclei 4 Λ H and 4 Λ He based on the EFT interactions can be found in Ref. [9].…”