Baryon-Baryon Interaction in Chiral Effective Field Theory

Abstract

The Jülich-Bonn-Munich Group has performed extensive studies of baryon-baryon interactions involving strange baryons ((formula presented), (formula presented), (formula presented)) within chiral effective field theory (EFT). A selection of the achieved results is presented. In particular, a calculation of the in-medium properties of a hyperon-nucleon interaction derived within chiral EFT and fitted to (formula presented) and (formula presented) scattering data is reviewed. Implications on the properties of neutron stars and, specifically, on the so-called hyperon-puzzle are addressed. In addition, results for baryon-baryon scattering in the strangeness (formula presented) sector, obtained at next-to-leading order in the chiral expansion, are presented.