Open bottom mesons in asymmetric nuclear matter in presence of strong magnetic fields

TL;DR

This paper investigates how strong magnetic fields and isospin asymmetry in nuclear matter affect the masses of open bottom mesons using a chiral effective model, revealing mass drops and isospin-breaking effects.

Contribution

It introduces a detailed calculation of open bottom meson mass modifications in magnetized, asymmetric nuclear matter, including effects of anomalous magnetic moments.

Findings

Masses of B and anti-B mesons decrease in magnetic fields.

Isospin asymmetry causes significant mass splitting at high densities.

Magnetic moments of nucleons influence meson mass modifications.

Abstract

The modifications of the masses of the $B$ and $\bar B$ mesons in asymmetric nuclear matter in the presence of strong magnetic fields, are investigated using a chiral effective model. The medium modifications of these open bottom mesons arise due to their interactions with the scalar mesons and the nucleons. In the magnetized nuclear matter, the proton has contributions from the Landau levels. In the chiral effective model, the masses of the $B$ and $\bar B$ are calculated from the leading term, namely the vectorial Weinberg Tomozawa term as well as from the next to leading order contributions, i.e., due to the scalar exchange and the range terms. Due to the Weinberg-Tomozawa term, the $\bar B$ mesons experience an attractive interaction in the symmetric nuclear matter, whereas the $B$ mesons have a repulsive interaction. Inclusion of the contributions from the scalar exchange and the range terms as well, leads to drop of the masses of both $B$ and $\bar B$ mesons. The effect of the isospin asymmetry breaks the mass degeneracy of the $B^+$ and $B^0$ (as well as of the $B^-$ and $\bar {B^0}$) mesons, and its effect is observed to be large at high densities. The effects of anomalous magnetic moments of the nucleons are taken into account in the present study of the masses of the open bottom mesons in magnetized nuclear matter.