Finite T meson correlations and quark deconfinement

Abstract

Finite temperature spatial $\bar q q$ correlation modes in the $π$ and $ρ$ channels are studied with the rainbow-ladder truncated quark Dyson-Schwinger equation and Bethe-Salpeter equation in the Matsubara formalism. To retain the finite range of the effective interaction while facilitating summation over fermion Matsubara modes necessary to ensure continuity at {T=0}, a separable kernel is used. The model is fixed by {T=0} properties and it implements dynamical chiral symmetry breaking and quark confinement. Above and below the deconfinement and chiral restoration transitions, we study $M_π(T)$, $f_π(T)$ and the 3-space transverse and longitudinal masses $M_ρ^T(T)$ and $M_ρ^L(T)$. For the $ρ$ mode we also study the strong and electromagnetic partial widths to determine the $T$-dependence that is generated by the quark content. The $ρ\to ππ$ width decreases sharply just above the chiral restoration transition leaving the $ρ$ with only its narrow {$e^+ e^-$} width. We discuss improvements needed by this model, especially in regard to the high $T$ behavior of the masses where we compare to lattice QCD simulations.