dorsal/arxiv
View Schema$K^-/K^+$ ratio in heavy-ion collisions at GSI with an antikaon self-energy in hot and dense matter
| Authors | Laura Tolós, Artur Polls, Angels Ramos, Jürgen Schaffner-Bielich |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0302082 |
| URL | https://arxiv.org/abs/nucl-th/0302082 |
| DOI | 10.1103/PhysRevC.68.024903 |
| Journal | Phys.Rev. C68 (2003) 024903 |
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.
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"abstract": "The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is\nstudied. The in-medium properties at finite temperature of the hadrons involved\nare included, paying a special attention to the in-medium properties of\nantikaons. Using a statistical approach, it is found that the determination of\nthe temperature and chemical potential at freeze-out conditions compatible with\nthe ratio $K^-/K^+$ is very delicate, and depends very strongly on the\napproximation adopted for the antikaon self-energy. The use of an energy\ndependent $\\bar{K}$ spectral density, including both s and p-wave components of\nthe $\\bar{K}N$ interaction, lowers substantially the freeze-out temperature\ncompared to the standard simplified mean-field treatment and gives rise to an\noverabundance of $K^-$ production in the dense and hot medium. Even a\nmoderately attractive antikaon-nucleus potential obtained from our\nself-consistent many-body calculation does reproduce the ``broad-band\nequilibration\u0027\u0027 advocated by Brown, Rho and Song due to the additional strength\nof the spectral function of the $K^-$ at low energies.",
"arxiv_id": "nucl-th/0302082",
"authors": [
"Laura Tol\u00f3s",
"Artur Polls",
"Angels Ramos",
"J\u00fcrgen Schaffner-Bielich"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.68.024903",
"journal_ref": "Phys.Rev. C68 (2003) 024903",
"title": "$K^-/K^+$ ratio in heavy-ion collisions at GSI with an antikaon self-energy in hot and dense matter",
"url": "https://arxiv.org/abs/nucl-th/0302082"
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