In-medium spectral change of omega 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 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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• Medium Modifcations of Mesons in Elementary Reactions and Heavy-Ion Collisions
• Factorization and Non-Factorization of In-Medium Four-Quark Condensates
• The rho meson in a scenario of pure chiral restoration
• Weighted finite energy sum rules for the omega meson in nuclear matter
• The width of the omega meson in the nuclear medium
• Operator Product Expansion and Quark-Hadron Duality: Facts and Riddles
• QCD sum rules at finite density in the large-N_c limit: The coupling of the rho-nucleon system to the D_{13}(1520)
• Algebraic Approach to Bare Nucleon Matrix Elements
• Rho - Omega Splitting and Mixing in Nuclear Matter
• The $\pi \rho$ Cloud Contribution to the $\omega$ Width in Nuclear Matter
• Finite-width QCD sum rules for rho and omega mesons
• Analysis of $\omega$ self-energy at finite temperature and density in the real-time formalism
• Chiral-partner D mesons in a heat bath within QCD sum rules
• Low energy ω(\to π^0 γ) meson photoproduction in the nucleus
• Hadrons in Medium
• Chiral Symmetry in Nuclei -- Theoretical Expectations and Hard Facts
• In-medium modification and decay asymmetry of omega mesons in cold nuclear matter
• Probing in-medium vector meson decays by double-differential di-electron spectra in heavy-ion collisions at SIS energies
• Omega mesons in medium - revisited
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