Bottom-strange mesons in hyperonic matter

TL;DR

This paper investigates the in-medium properties of bottom-strange mesons in hot, dense, and asymmetric hadronic matter using a chiral effective model, revealing significant density and strangeness dependence and differences from charmed-strange mesons.

Contribution

It extends the chiral effective model to study bottom-strange mesons, highlighting their medium modifications and differences from charmed-strange counterparts despite similar formalism.

Findings

Mass of bottom-strange mesons depends on baryonic density and strangeness.

Mass degeneracy of $B_S^0$ and ${ar B}_S^0$ is lifted in hyperonic matter.

Distinct in-medium behavior compared to charmed-strange mesons.

Abstract

The in-medium behavior of bottom-strange pseudoscalar mesons in hot, isospin asymmetric and dense hadronic environment is studied using a chiral effective model. The same was recently generalized to the heavy quark sector and employed to study the behavior of open-charm and open-bottom mesons. The heavy quark (anti-quark) is treated as frozen and all medium modifications of these bottom-strange mesons are due to their strange anti-quark (quark) content. We observe a pronounced dependence of their medium mass on baryonic density and strangeness content of the medium. Certain aspects of these in-medium interactions are similar to those observed for the strange-charmed mesons in a preceding investigation, such as the lifting of mass-degeneracy of $B_S^0$ and ${\bar B}_S^0$ mesons in hyperonic matter, while the same is respected in vacuum as well as in nuclear matter. In general, however, there is a remarkable distinction between the two species, even though the formalism predicts a completely analogous in-medium interaction Lagrangian density. We discuss in detail the reason for different in-medium behavior of these bottom-strange mesons as compared to charmed-strange mesons, despite the dynamics of the heavy quark being treated as frozen in both cases.