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In this paper we carried out a nonperturbative analysis of a thermalquasifermion in the chiral symmetric thermal QCD/QED medium by studying itsself-energy function through the Dyson-Schwinger equation with thehard-thermal-loop resummed improved ladder kernel. Our analysis reveals severalinteresting results, two in some of which may force us to change the image ofthermal quasifermions: (1) The thermal mass of a quasifermion begins todecrease as the strength of the coupling gets stronger and finally disappearsin the strong coupling region, thus showing a property of a massless particle,and (2) its imaginary part (i.e., the decay width) persists to have $O(g^2T\log(1/g))$ behavior. These results suggest that in the recently producedstrongly coupled quark-gluon plasma, the thermal mass of a quasiquark shouldvanish. Taking into account the largeness of the imaginary part, it seems veryhard for a quark to exist as a qausiparticle in the strongly coupledquark-gluon plasma phase. Other important findings are as follows: (3) Thecollective plasmino mode disappears also in the strongly coupled system, and(4) there exists an ultrasoft third peak in the quasifermion spectral densityat least in the weakly coupled QED/QCD plasma, indicating the existence of theultrasoft fermionic mode.

Structure of a thermal quasifermion in the QCD/QED Medium