Speaker: Olga Solovjeva (ITEP, Moscow)
Title: Light vector mesons in external magnetic field by Quenched SU(3) Lattice QCD
Abstract: We have explored ground state energies of the light vector mesons on the base of the SU(3) lattice gauge theory. This study was performed without dynamical quarks. We have observed the energies splitting depending on the value of the spin projections on an external magnetic field. Landau level describes the energy of a charged point-like particle in a magnetic field, while in our calculations we took into account the quark structure of a particle and introduced the terms with magnetic polarizabilities. The magnetic dipole polarizability and hyperpolarizabilities give significant contributions to the energy value which prevents the formation of the charged vector meson condensate at high magnetic fields(~1GeV^2). We have calculated the g-factor of rho and K^* mesons and the dipole magnetic polarizability of rho mesons, different phenomenological models and experimentally obtained data. For most mesons the magnetic polarizability and g-factor has not been found experimentally yet. There still exist large uncertainties in determination of the electric and magnetic polarizabilities. According to the chiral perturbation theory magnetic and electric polarizabilities are interrelated, what stresses the importance of calculating magnetic polarizability.