Vector $K^{*}$ mesons in external magnetic field from SU(3) gluodynamics

Abstract

We explore the ground state energies of the neutral and charged vector $K^{*}$ mesons in the external abelian magnetic field of QCD scale using overlap fermions. We calculate the magnetic dipole polarizability of the $K^{*0}$ and $\bar{K}^{*0}$ mesons and investigate its dependence on the ratio of the strange quark mass to the light quark mass. It is found that the ground state energy and the magnetic dipole polarizability depends on the meson spin projection on the magnetic field axis. This leads to the appearance of dileptonic asymmetry, which can be characterized by the tensor polarizability value estimated for the $K^{*0}$ mesons. We found that the $g$-factor of the vector $K^{*\pm}$ mesons depends on the $m_s/m_u$ value. Also we do not observe any evidence of the tachyonic mode existence for the strange vector mesons.