$K^{-}/K^{+}$ ratio in heavy-ion collisions at GSI with an antikaon self-energy in hot and dense matter

Abstract

The $K^{-}/K^{+}$ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio $K^{-}/K^{+}$ is very delicate, and depends very strongly on the approximation adopted for the antikaon self-energy. The use of an energy dependent $\bar{K}$ spectral density, including both s and p-wave components of the $\bar{K}N$ interaction, lowers substantially the freeze-out temperature compared to the standard simplified mean-field treatment and gives rise to an overabundance of $K^{-}$ production in the dense and hot medium. Even a moderately attractive antikaon-nucleus potential obtained from our self-consistent many-body calculation does reproduce the ``broad-band equilibration'' advocated by Brown, Rho and Song due to the additional strength of the spectral function of the $K^{-}$ at low energies.

arXiv comment20 pages, 6 figures, sent to Phys. Rev. C

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• Kaon production in heavy ion reactions at intermediate energies
• Properties of D-mesons in nuclear matter within a self-consistent coupled-channel approach
• D-mesons: In-medium effects at FAIR
• Statistical production of antikaon nuclear bound states in heavy ion collisions
• Anti-strange meson-baryon interaction in hot and dense nuclear matter
• Kaon Condensation and Lambda-Nucleon Loop in the Relativistic Mean-Field Approach
• Strangeness production in heavy ion reactions at intermediate energies
• Thermal kaons production in the relativistic heavy ions collision
• What is so special about strangeness in hot matter?
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• D-mesons in dense nuclear matter
• In-medium effects on the $K^{-}/K^{+}$ ratio at GSI
• The properties of the D-meson in dense matter
• K^-/K^+ ratio at GSI in hot and dense matter
• Heavy Mesons in Nuclear Matter and Nuclei
• Strangeness and Charm in Nuclear Matter
• Open-charm enhancement at FAIR?