Strange two-baryon interactions using chiral effective field theory

TL;DR

This paper develops a chiral effective field theory for strange baryon-baryon interactions, successfully describing scattering data and predicting a bound hypertriton, advancing understanding of hyperon interactions.

Contribution

It introduces a leading order chiral potential for S=-1,-2 baryon interactions using SU(3) symmetry, with six low-energy coefficients, and achieves good data agreement.

Findings

Good description of scattering data

Prediction of 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)_f 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.