Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 15, Issue 4, Pages 529-537Publisher
SPRINGER
DOI: 10.1140/epja/i2002-10062-4
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QCD sum rules are evaluated at finite nucleon densities and temperatures to determine the change of mass parameters for the lightest vector mesons rho, omega and phi in a strongly interacting medium. For conditions relevant for the starting experiments at HADES we find that the in-medium mass shifts of the rho- and omega-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 rho-meson and can lead to a change of the sign of the omega-meson mass shift as a function of the density. In contrast, the in-medium mass of the phi-meson is directly related to the chiral strange quark condensate which seems correspondingly accessible.
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