S=-1,-2 baryon-baryon interactions in chiral effective field theory

TL;DR

This paper develops a leading order chiral effective field theory potential for S=-1,-2 baryon-baryon interactions, successfully describing scattering data and predicting a bound hypertriton.

Contribution

It introduces a novel chiral EFT approach for hyperon interactions with SU(3) symmetry constraints and solves the Lippmann-Schwinger equation to match experimental data.

Findings

Good fit to scattering data

Predicted a bound hypertriton

Potential based on meson exchanges and contact terms

Abstract

We have constructed the leading order strangeness S=-1,-2 baryon-baryon potential in a chiral effective field theory approach. The chiral potential consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon contact terms. The potential, derived using SU(3) symmetry constraints, contains six independent low-energy coefficients. We have solved a regularized Lippmann-Schwinger equation and achieved a good description of the available scattering data. Furthermore a correctly bound hypertriton has been obtained.