A systematically study of thermal width of heavy quarkonia in a finite temperature magnetized background from holography

TL;DR

This paper uses holography to systematically analyze how magnetic fields at finite temperatures affect the thermal widths and potentials of heavy quarkonia, revealing that magnetic influence is significant at low temperatures but diminishes as temperature increases.

Contribution

It provides a detailed holographic study of the magnetic field's impact on heavy quarkonia's thermal properties at finite temperature, especially highlighting anisotropic effects based on dipole orientation.

Findings

Magnetic field has minimal effect on the real potential but significantly influences the imaginary potential at low temperatures.

Thermal width of $ff(1s)$ is notably affected by magnetic fields at low temperatures, especially when dipoles move parallel to the magnetic field.

The effect of magnetic field on thermal width decreases with increasing temperature, becoming negligible at high temperatures.

Abstract

By simulating the finite temperatures magnetized background in the RHIC and LHC energies, we systematically study the characteristics of thermal widths and potentials of heavy quarkonia. It is found that the magnetic field has less influence on the real potential, but has a significant influence on the imaginary potential, especially in the low deconfined temperature. Extracted from the effect of thermal worldsheet fluctuations about the classical configuration, the thermal width of $\Upsilon(1s)$ in the finite temperature magnetized background is investigated. It is found that at the low deconfined temperature the magnetic field can generate a significant thermal fluctuation of the thermal width of $\Upsilon(1s)$, but with the increase of temperature, the effect of magnetic field on the thermal width becomes less important, which means the effect of high temperature completely exceeds that of magnetic field and magnetic field become less important at high temperature. The thermal width decreases with the increasing rapidity at the finite temperature magnetized background. It is also observed that the effect of the magnetic field on the thermal width when dipole moving parallel to the magnetic field direction are larger than that moving perpendicular to the magnetic field direction, which implies that the magnetic field tends to enhance thermal fluctuation when dipole moving parallel to the direction of magnetic field. The thermal width of $\Upsilon(1S)$ hardly changes with the increasing temperature when dipole moving perpendicular to the magnetic field. But when dipole moving parallel to the magnetic field, the thermal width at low temperature is obviously larger than that at high temperature.