Abstract:
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 ρ- 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.
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Received: 15 May 2002 / Accepted: 31 July 2002 / Published online: 10 December 2002
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Communicated by A. Schäfer
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Zschocke, S., Pavlenko, O. & Kämpfer, B. Evaluation of QCD sum rules for light vector mesons at finite density and temperature. Eur Phys J A 15, 529–537 (2002). https://doi.org/10.1140/epja/i2002-10062-4
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DOI: https://doi.org/10.1140/epja/i2002-10062-4