$\Lambda$ and $\Sigma$ potentials in dense matter based on chiral EFT: Bridging heavy-ion collisions, hypernuclei, and neutron stars

TL;DR

This paper uses chiral effective field theory to calculate hyperon potentials in dense matter, linking heavy-ion collision data, hypernuclei, and neutron star physics through flow analysis.

Contribution

It introduces a chiral EFT-based approach to determine hyperon potentials and connects these to observable flow phenomena in heavy-ion collisions.

Findings

$ ext{Lambda}$ and $ ext{Sigma}$ flow sensitive to hyperon potentials

Flow differences more pronounced for $ ext{Sigma}^0$

Potential variations impact hyperon flow observables

Abstract

The $\Lambda$ and $\Sigma$ directed flows at $\sqrt{s_{NN}}=4.5~\mathrm{GeV}$ are investigated to examine their sensitivity to the hyperon single-particle potentials. The single-particle potentials are obtained from $G$-matrix calculations with two- and three-body forces based on SU(3) chiral effective field theory. The $\Lambda+\Sigma^0$ directed flow shows sensitivity to the variation in the $\Sigma$ single-particle potential. Its effect is more pronounced for the $\Sigma^0$ directed flow.