Hyperon-nucleon interaction at next-to-leading order in chiral effective field theory

TL;DR

This paper develops a next-to-leading order chiral effective field theory model for hyperon-nucleon interactions, accurately describing Lambda N and Sigma N systems by including meson exchanges and contact terms with SU(3) symmetry considerations.

Contribution

It introduces a chiral effective field theory approach at next-to-leading order for hyperon-nucleon interactions, incorporating SU(3) symmetry and explicit symmetry breaking effects.

Findings

Achieves an excellent fit to hyperon-nucleon data.

Comparable quality to advanced phenomenological models.

Includes detailed meson exchange and contact interaction contributions.

Abstract

Results for the Lambda N and Sigma N interactions obtained at next-to-leading order in chiral effective field theory are reported. At the order considered there are contributions from one- and two-pseudoscalar-meson exchange diagrams and from four-baryon contact terms without and with two derivatives. SU(3) flavor symmetry is imposed for constructing the hyperon-nucleon interaction while the explicit SU(3) symmetry breaking by the physical masses of the pseudoscalar mesons (pi, K, eta) is taken into account. An excellent description of the hyperon-nucleon system can be achieved at next-to-leading order. It is on the same level of quality as the one obtained by the most advanced phenomenological hyperon-nucleon interaction models.