Rho-meson resonance broadening in QCD at finite temperature

Abstract

Thermal Finite Energy QCD sum rules for the vector current correlator are used to study quark-gluon deconfinement. Assuming $\rho$-meson saturation of the correlator in the hadronic sector, and the Operator Product Expansion in QCD, we obtain the temperature behavior of the resonance parameters (coupling, mass, and width), and of the leading vacuum condensates, as well as the perturbative QCD threshold in the complex squared energy plane. The results are consistent with quark-gluon deconfinement at a critical temperature $T_c\simeq 197MeV$. The temperature dependence of the $\rho$-meson width is of importance for current experiments on dimuon production in nuclear collisions.

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• Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
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• Dimuon production from in-medium rho decays from QCD sum rules
• Light scalar $K_0^{\ast }(700)$ meson in vacuum and a hot medium
• Weinberg sum rules at finite temperature
• Axial-vector form factor of nucleons at finite temperature from the AdS/QCD soft-wall model
• Determination of the temperature dependence of the up- down-quark mass in QCD
• Thermal behavior of the mass and residue of hyperons
• Relation between the continuum threshold and the Polyakov loop with the QCD deconfinement transition
• Hadronic matter at the edge: A survey of some theoretical approaches to the physics of the QCD phase diagram
• Unified analysis of screening masses for vector and axial-vector mesons and their diquark partners in the Contact Interaction model