Hypernuclei in the quark-meson coupling model

TL;DR

This paper uses an advanced quark-meson coupling model to study hypernuclei, revealing that in-medium hyperfine interactions significantly alter predictions for Sigma hypernuclei, aligning theory with experimental observations.

Contribution

The study introduces a self-consistent inclusion of mean scalar field effects on hyperfine interactions in the QMC model, changing hypernuclei predictions.

Findings

Sigma hypernuclei are unbound in the latest QMC model.

In-medium hyperfine interactions increase repulsion, affecting hypernuclei stability.

Results align with experimental absence of Sigma hypernuclei.

Abstract

We present results of hypernuclei calculated in the latest quark-meson coupling (QMC) model, where the effect of the mean scalar field in-medium on the one-gluon exchange hyperfine interaction, is also included self-consistently. The extra repulsion associated with this increased hyperfine interaction in-medium completely changes the predictions for {\Sigma} hypernuclei. Whereas in the earlier version of QMC they were bound by an amount similar to {\Lambda} hypernuclei, they are unbound in the latest version of QMC, in qualitative agreement with the experimental absence of such states.