Effect of the anomalous magnetic moment of quarks on magnetized QCD matter and meson spectra

TL;DR

This paper explores how the anomalous magnetic moment of quarks influences magnetized QCD matter and meson spectra, revealing complex effects on meson masses and magnetic susceptibility under magnetic fields.

Contribution

It systematically analyzes the impact of quark AMM on magnetized QCD matter and meson spectra, highlighting effects on inverse magnetic catalysis and meson mass behaviors.

Findings

Quark AMM reduces dynamical quark mass and influences inverse magnetic catalysis.

Neutral pion mass decreases rapidly with magnetic field, sensitive to AMM.

Charged rho meson masses vary nonlinearly with magnetic field depending on spin orientation.

Abstract

We systematically investigate the effect of the anomalous magnetic moment(AMM) of quarks on the magnetized QCD matter, including the magnetic susceptibility, the inverse magnetic catalysis around the critical temperature and the neutral/charged pion and rho meson spectra under magnetic fields. The dynamical AMM of quarks, its coupling with magnetic field causes Zeeman splitting of the dispersion relation of quarks thus changes the magnetism properties and meson mass spectra under magnetic fields. It is found that including the AMM of quarks cannot fully understand lattice results of the magnetized matter: The AMM of quarks reduces the dynamical quark mass thus causes the inverse magnetic catalysis around $T_c$. The neutral pion mass is very sensitive to the AMM, it decreases with magnetic field quickly, and the charged pion mass shows a nonlinear behavior, i.e., firstly linearly increases with the magnetic field and then saturates at strong magnetic field. For rho meson, it is observed that AMM reduces the mass of neutral rho meson mass with different $s_z$, and reduces the mass of $s_z=+1,0$ component charged rho meson mass but enhances the $s_z=-1$ component charged rho meson mass. The magnetic susceptibility at low temperature can be either positive or negative with different AMM.