Polyakov linear-sigma model: in-medium modifications of various meson states

Seminars

Seminar “Theory of Hadronic Matter under Extreme Conditions”

Date and Time: Wednesday, 22 March 2023, at 4:00 PM

Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics, online seminar on Zoom

Information about seminar and link to join via Zoom

Seminar topic: “Polyakov linear-sigma model: in-medium modifications of various meson states”

Speaker: Abdel Nasser Tawfik (Future University in Egypt)

Abstract:

In SU(3) Polyakov linear sigma model (PLSM), in which the chiral symmetry and gluonic degrees of freedom are integrated in the hadronic and partonic phase, the QCD phase structure and its magnetic properties are analyzed in thermal and dense medium, at finite magnetic field. Both Landau quantization and magnetic catalysis are implemented so that magnetization, magnetic susceptibility and permeability have been estimated. We find that the partonic phase has higher values of magnetization, magnetic susceptibility, and permeability than the hadronic phase. We also study the chiral phase structure of: a) pseudoscalars (Jpc=0−+), b) scalars (Jpc=0++), c) vectors (Jpc=1−−), and d) axial-vectors (Jpc=1++) meson states, at finite temperature, baryon chemical potential and magnetic field. The in-medium (thermal and density) characteristics of nonet meson states normalized to the lowest bosonic Matsubara frequencies are also analyzed. We noticed that the meson masses normalized to normalized become temperature independent at characterizing critical temperatures. We observe that the chiral and deconfinement phase transitions are shifted to lower quasicritical temperatures with increasing chemical potential and magnetic field. We also find that increasing chemical potential enhances the mass degeneracy of the various meson masses, while increasing the magnetic field seems to reduce the critical chemical potential, at which the chiral phase transition takes place. Our mass spectrum calculations, at vanishing temperature, agree well with PNJL, lattice QCD calculations, QMD/UrQMD simulations, and the recent PDG compilations.