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

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, $m_{{\Sigma }_b}^{\ast }<m_{{\Xi }_b}^{\ast }$, 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.

Comments: 4 pages, 2 figures, version accepted for the QNP2018 proceedings, references updated, talk given at QNP2018, 8th International Conference on Quarks and Nuclear Physics, Nov. 13 -17, 2018, Tsukuba, Ibaraki, Japan