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Saeedeh Sadeghian

Saeedeh Sadeghian

Academic rank: Assistant Professor
Education: PhD.
Faculty: Science
Address: University of Mazandaran
Phone: 011-35302442


Properties of neutral mesons in a hot and magnetized quark matter
meson, quark, Nambu-Jona-Lasinio model, chemical potential, screening, external magnetic field
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Researchers Shima Fayazbakhsh ، Saeedeh Sadeghian ، Neda Sadooghi


The properties of noninteracting σ and π0 mesons are studied at finite temperature, chemical potential, and in the presence of a constant magnetic field. To do this, the energy dispersion relations of these particles, including nontrivial form factors, are derived using a derivative expansion of the effective action of a two-flavor, hot and magnetized Nambu—Jona-Lasinio model up to second order. The temperature dependence of the pole and screening masses as well as the directional refraction indices of magnetized neutral mesons are explored for fixed magnetic fields and chemical potentials. It is shown that, because of the explicit breaking of the Lorentz invariance by the magnetic field, the refraction index and the screening mass of neutral mesons exhibit a certain anisotropy in the transverse and longitudinal directions with respect to the direction of the external magnetic field. In contrast to their longitudinal refraction indices, the transverse indices of the neutral mesons are larger than unity.