Certain three-baryon force parameters that make Lambda hyperons repulsive at high density also reproduce the empirical Sigma potential and existing hypernuclear and heavy-ion data.
Hyperons in nuclear matter from SU(3) chiral effective field theory
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abstract
Brueckner theory is used to investigate the properties of hyperons in nuclear matter. The hyperon-nucleon interaction is taken from chiral effective field theory at next-to-leading order with SU(3) symmetric low-energy constants. Furthermore, the underlying nucleon-nucleon interaction is also derived within chiral effective field theory. We present the single-particle potentials of Lambda and Sigma hyperons in symmetric and asymmetric nuclear matter computed with the continuous choice for intermediate spectra. The results are in good agreement with the empirical information. In particular, our calculation gives a repulsive Sigma-nuclear potential and a weak Lambda-nuclear spin-orbit force.
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$\Lambda$ and $\Sigma$ potentials in neutron stars, hypernuclei, and heavy-ion collisions
Certain three-baryon force parameters that make Lambda hyperons repulsive at high density also reproduce the empirical Sigma potential and existing hypernuclear and heavy-ion data.