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Title: K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter
Author: Tolós Rigueiro, Laura
Polls Martí, Artur
Ramos Gómez, Àngels
Schaffner-Bielich, Jürgen
Keywords: Reaccions nuclears
Constitució de la matèria
Col·lisions (Física nuclear)
Nuclear reactions
Constitution of matter
Collisions (Nuclear physics)
Issue Date: 2003
Publisher: The American Physical Society
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
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review C, 2003, vol. 68, núm. 2, p. 024903-1, 024903-11
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ISSN: 0556-2813
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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