Probing chiral restoration with ρ-meson melting through sum rules

[摘要] We investigate whether the rho-meson melting scenario is compatible with chiral symmetry restoration utilizing a comprehensive evaluation of the QCD and Weinberg sum rules at finite temperature. As input to this analysis, in-medium vector spectral functions which describe dilepton data from ultra-relativistic heavy-ion collisions are used along with temperature dependent condensates from lattice calculations, when available, or approximated by a hadron resonance gas. The combined deployment of QCD and Weinberg sum rules turns out to be rather stringent in constructing axialvector spectral functions consistent with (partial) chiral restoration.

[发布机构] Cyclotron Institute, Department of Physics and Astronomy, Texas A and M University, College Station; TX; 77843-3366, United States^1

[关键词] Chiral symmetry restoration;Comprehensive evaluation;Finite temperatures;Hadron resonance gas;Lattice calculations;Spectral function;Temperature dependent;Ultrarelativistic heavy ion collision