Evaluation of QCD sum rules for light vector mesons at finite density and temperature |
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Authors: | S Zschocke OP Pavlenko B Kämpfer |
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Institution: | (1) Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany, DE;(2) Institute for Theoretical Physics, 03143 Kiev - 143, Ukraine, UA |
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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.
Received: 15 May 2002 / Accepted: 31 July 2002 / Published online: 10 December 2002
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ID="a"e-mail: Kaempfer@fz.rossendorf.de
Communicated by A. Sch?fer |
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Keywords: | PACS 14 40 Cs Other mesons with S = C = 0 mass < 2 5GeV – 21 65 +f Nuclear matter – 11 30 Rd Chiral symmetries – 24 85 +p Quarks gluons and QCD in nuclei and nuclear processes |
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