# In-medium properties of the low-lying bottom baryons in the quark-meson coupling model

## TL;DR

This paper investigates how the properties of low-lying bottom baryons, specifically $\Sigma_b$ and $\Xi_b$, change within nuclear matter using the quark-meson coupling model, revealing density-dependent mass inversions.

## Contribution

It provides the first detailed analysis of in-medium modifications of $\Sigma_b$ and $\Xi_b$ baryons using the QMC model, highlighting the density-dependent mass hierarchy.

## Key findings

- The effective mass of $\Sigma_b$ becomes smaller than that of $\Xi_b$ at moderate densities.
- In vacuum, $m_{\Sigma_b} > m_{\Xi_b}$, but this order reverses in medium.
- Lorentz-vector potentials significantly affect excitation energies of bottom baryons.

## Abstract

In-medium properties of the low-lying baryons are studied in the quark-meson coupling (QMC) model, focusing on the $\Sigma_b$ and $\Xi_b$ baryons. It is predicted that the Lorentz-scalar effective mass of $\Sigma_b$ becomes smaller than that of $\Xi_b$ at moderate nuclear matter density, and as the density increases, namely, $m^*_{\Sigma_b} < m^*_{\Xi_b}$, although in vacuum $m_{\Sigma_b} > m_{\Xi_b}$. We also study the effects of the repulsive Lorentz-vector potentials on the excitation energies of these bottom baryons.