Section VI QCD at High Temperature and DensityNo Access

QUARK SPECTRUM ABOVE THE CRITICAL TEMPERATURE FROM SCHWINGER–DYSON EQUATION

MASAYASU HARADA

Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan

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YUKIO NEMOTO

Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan

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SHUNJI YOSHIMOTO

Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan

Poster presented by S. Y. at Quark Matter 2006.

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https://doi.org/10.1142/S0218301307007817Cited by:0 (Source: Crossref)

Abstract

We investigate a spectrum of a fermion, which we call a quark, above the critical temperature of the chiral phase transition in a gauge theory using the Schwinger–Dyson (SD) equation. The SD equation enables us to study the spectrum over a wide range of the gauge coupling. It is shown that the quark spectrum has two sharp peaks which correspond to the normal quasi-quark and the plasmino and is consistent with that obtained in the hard thermal loop approximation in the weak coupling region, while it has also two peaks but with smaller thermal masses and broader widths in the strong coupling region. Temperature-dependence of the quark spectrum is also discussed.

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QUARK SPECTRUM ABOVE THE CRITICAL TEMPERATURE FROM SCHWINGER–DYSON EQUATION

Abstract

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