The Degrees of Freedom in Hot Quenched QCD

TL;DR

This paper investigates the behavior of mesonic channels in quenched QCD at finite temperature, revealing the absence of a pseudoscalar pole above the critical temperature and analyzing effective couplings.

Contribution

It provides the first demonstration of the absence of a pseudoscalar pole in quenched QCD above T_c and extracts effective four-fermion couplings across temperatures.

Findings

No pseudoscalar pole for T > T_c in quenched QCD.

Effective four-fermion couplings differ between pseudoscalar and vector channels.

Hadronic parameters vary little below T_c.

Abstract

In quenched QCD, on lattices with $\nt=4$, the absence of a pole in the pseudoscalar meson channel for $T>T_c$ is demonstrated. A set of effective 4-fermi couplings is extracted. It is observed that this coupling is small in the vector channel for all $T>T_c$, but not in the pseudoscalar channel. The temperature dependence of hadronic parameters below \tc{} is found to be small. NOTE: Latex source, no figures, needs espcrc2.sty from hep-lat macros.