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

Abstract Within QCD sum rules at finite baryon density we show the crucial role of four-quark condensates, such as 〈( q γ μ λ a q) 2 〉 n , for the in-medium modification of the ω meson spectral function. In particular, such a global property as the sign of the in-medium ω 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 ω meson resonance we employ a hadron spectral function based on the ω meson propagator delivered by an effective chiral Lagrangian. Measurements of the ω meson spectral change in heavy-ion collisions with the HADES detector can reveal the yet unknown density dependence of the four-quark condensate.

• Publication year

  2002

• Venue

  Physics Letters B

• Publication date

  2002-12-16

• Fields of study

  Physics

• Identifiers
  DOI 10.1016/S0370-2693(03)00551-3arXiv hep-ph/0212201
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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