Evaluation of QCD sum rules for light vector mesons at finite density and temperature
Evaluation of QCD sum rules for light vector mesons at finite density and temperature
Zschocke, S.; Pavlenko, O. P.; Kämpfer, B.
QCD sum rules are evaluated at finite nucleon densities and temperatures to determine the change of mass parameters
for the lightest vector mesons ρ, ω and Φ in a strongly interacting medium. For conditions relevant for the starting experiments at HADES we find that the in-medium mass shifts of the ͦ and ω mesons are governed, within the Borel QCD sum rule approach, by the density and temperature dependence of the four-quark condensate. In particular, the variation of the strength of the density dependence of the four-quark condensate reflects directly the decreasing mass of the ρ meson and can lead to a change of the sign of the ω meson mass shift as a function of the density. In contrast, the in-medium mass of the Φ-meson is directly related to the chiral strange quark condensate which seems correspondingly accessible.
Keywords: QCD sum rules; vector meson properties
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Eur.Phys.J.A15:529-537,2002
nucl-th/0205057
DOI: 10.1140/epja/i2002-10062-4
Cited 68 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-4454