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arXiv · hep-ph/0212201

In-medium spectral change of omega mesons as a probe of QCD four-quark condensate

S. Zschocke·O. P. Pavlenko·B. Kampfer
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Abstract

Within QCD sum rules at finite baryon density we show the crucial role of four-quark condensates for the in-medium modification of the omega meson spectral function. In particular, such a global property as the sign of the in-medium omega meson mass shift is found to be governed by a parameter which describes the strength of the density dependence of the four-quark condensate beyond mean-field approximation. To study self-consistently the broadening of the omega meson resonance we employ a hadron spectral function based on the omega meson propagator delivered by an effective chiral Lagrangian. Measurements of the omega meson spectral change in heavy-ion collisions with the HADES detector can reveal the yet unknown density dependence of the four-quark condensate.

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S. Zschocke, O. P. Pavlenko, B. Kampfer. 2002-12-16. In-medium spectral change of omega mesons as a probe of QCD four-quark condensate. https://doi.org/10.1016/s0370-2693(03)00551-3

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