Strangeness S=-2 baryon-baryon interactions using chiral effective field theory

TL;DR

This paper develops a theoretical framework using chiral effective field theory to describe baryon-baryon interactions with strangeness S=-2, aligning predictions with experimental data.

Contribution

It introduces a leading order chiral effective field theory model for S=-2 baryon interactions, relating it to S=-1 channels via SU(3) symmetry.

Findings

Predictions agree with experimental data

Potential includes contact terms and meson exchanges

SU(3) symmetry relates different strangeness sectors

Abstract

We derive the leading order strangeness S=-2 baryon-baryon interactions in chiral effective field theory. The potential consists of contact terms without derivatives and of one-pseudoscalar-meson exchanges. The contact terms and the couplings of the pseudoscalar mesons to the baryons are related via SU(3) flavor symmetry to the S=-1 hyperon-nucleon channels. We show that the chiral effective field theory predictions with natural values for the low-energy constants agree with the experimental information in the S=-2 sector.