Structure of Thermal Quasi-Fermion in QED/QCD from the Dyson-Schwinger Equation

We non-perturbatively study the structure of quasi-fermion in thermal QED/QCD by solving the Dyson-Schwinger equation in the wide range of temperature as well as of coupling constant. The three-peak structure of the quasi-fermion spectrum, suggested by Harada and Nemoto in a chiral invariant linear sigme model, is clearly seen in QED/QCD. Behavior of the decay width as a function of temperature as well as coupling constant shows the clear deviation from the HTL results. Change of the structure across the boundary of chiral phase transition is also studied in detail.

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