Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-04-13
Int.J.Mod.Phys.E16:2263-2268,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
6pages, 5 figures. Poster presentation at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (
Scientific paper
10.1142/S0218301307007787
We calculate the spectral function of the massive quark at finite temperature (T) using a Yukawa model and show that the peak in the negative energy region among the three-peaks found in a previous work for the massless quark is largely suppressed. To explore the underlying mechanism of this behavior, we also investigate the pole structure of the retarded Green function of the quark. We will show the result only for the massless quark. We find the residues of the poles corresponding the three-peaks are all comparable at $T\sim m_b$. We also show that the multi-peak structure of the quark spectra is well described in the pole approximation which indicates that the quasi-paricle picture is valid in this $T$ region.
Kitazawa Masakiyo
Kunihiro Teiji
Mitsutani Kazuya
Nemoto Yukio
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