Open Bottom Mesons and Upsilon States in Hot Magnetized Strange Hadronic Matter

TL;DR

This study investigates how hot, magnetized strange hadronic matter affects the masses of open bottom mesons and upsilon states, revealing mass modifications due to temperature, magnetic fields, and medium interactions, with implications for heavy-ion collision experiments.

Contribution

It provides a detailed analysis of bottom meson and upsilon mass shifts in magnetized, hot, asymmetric strange hadronic matter using a chiral effective Lagrangian approach, including Landau quantization effects.

Findings

Open bottom mesons and upsilon states experience mass drops in magnetized medium.

Masses increase with temperature up to 90 MeV, then decrease at higher temperatures.

Magnetic field effects depend on temperature, increasing masses below 90 MeV and decreasing above.

Abstract

The masses of open bottom mesons ($B$($B^+$,$B^0$), $\bar{B}$($B^-$,$\bar{B^0}$), $B_s$(${B_{s}}^0$, $\bar{{B_s}^0}$)) and upsilon states ($\Upsilon(1S)$, $\Upsilon(2S)$, $\Upsilon(3S)$, $\Upsilon(4S)$, and $\Upsilon(1D)$) are investigated in the isospin asymmetric strange hadronic medium at finite temperature in the presence of strong magnetic fields using a chiral effective Lagrangian approach. For charged baryons, the magnetic field introduces contribution from Landau energy levels. The masses of the open bottom mesons get modified through their interactions with the baryons and the scalar mesons, which undergo modifications in a magnetized medium. The charged open bottom mesons have additional positive mass shifts due to Landau quantization in the presence of the magnetic field. The medium mass shift of the upsilon states originates from the modification of the gluon condensates simulated by the variation of dilaton field ($\chi$) and a quark mass term in the magnetized medium. The open bottom mesons and upsilon states experience a mass drop in the magnetized medium. The masses of these mesons initially increase with a rise in temperature, and beyond a high value of temperature, their masses are observed to drop. When the temperature is below 90 MeV, the in-medium masses of the mesons increase with an increase in the magnetic field. However, at high temperatures (T $>$ 90 MeV), the masses are observed to drop with an increase in the magnetic field. The dominant in-medium effects are the density effects, which can have observable effects in asymmetric heavy-ion collisions planned at compressed baryonic matter experiments at FAIR at the future facility of GSI.