Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 20: Theory III

HK 20.9: Talk

Tuesday, March 9, 2004, 18:00–18:15, E

ρ−ω splitting and mixing in nuclear matter — •Sven Zschocke and Burkhard Kämpfer — Forschungszentrum Rossendorf e.V., Institut für Kern- und Hadronenphysik, D-01314 Dresden,Postfach 51 01 19

We investigate mass splitting and mixing effect of ρ and ω mesons in nuclear matter within the QCD sum rule approach in zero-width approximation. In matter, ρ and ω differ only by a scalar flavour mixed condensate and a twist-4 four-quark condensate as long as one is restricted to dimension-6 operators. In our sum rule analysis we have taken into account both condensates and investigate the impact of the poorly known four-quark condensate. Both effects, mixing and splitting, are much stronger in a nuclear medium than in vacuum. This triggers the hope to verify this in-medium effects with experiments like HADES at GSI.