Rho parameters from odd and even chirality, thermal QCD sum rules

Abstract

Like the even chirality correlation functions of, say, the two vector currents, one can also consider odd chirality correlation functions to write thermal QCD sum rules. They contain fewer non-perturbative corrections, at least to the leading order. Here we write such a sum rule for the correlation function of vector and tensor 'currents'. The odd and even chirality sum rules are taken together to evaluate the effective parameters of the $ρ$ meson to second order in temperature. To within errors, the results are consistent and reproduce the absence of shift in the $ρ$ meson mass to this order.