Vector Meson Dominance and $g_{\rho \pi \pi }$ at Finite Temperature from QCD Sum Rules

C. A. Dominguez, M. S. Fetea, M. Loewe

A Finite Energy QCD sum rule at non-zero temperature is used to determine the $q^2$- and the T-dependence of the $\rho \pi \pi$ vertex function in the space-like region. A comparison with a…