Yoshimoto, Shunji (Nagoya)
"Quark spectrum above the critical temperature from Schwinger-Dyson equation"
We will present the collective fermionic excitations above but near critical temperature for the chiral phase transition. In this analysis, we have used the Schwinger-Dyson equation to include non-perturbative quark-gluon interactions. We have obtained a fermionic spectral function by
performing the analytic continuation to Minkowski space using an integral equation, the Schwinger-Dyson equation itself. We show that, even in the strong coupling region, the quark spectrum has a peak corresponding to the plasmino in addition to the peak corresponding to the normal quasi-particle, although these peaks are very broad. Furthermore, in the strong coupling region, the thermal mass is almost independent of the coupling and the ratio of the thermal mass to the tempereture is approximately unity.( based on the works done in collaboration with M.Harada and Y.Nemoto)
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