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2003

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/11005

K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter

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Recurs relacionat

http://doi.org/10.1103/PhysRevC.68.024903

Resum

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

Matèries

Reaccions nuclears, Constitució de la matèria, Col·lisions (Física nuclear)

Matèries (anglès)

Nuclear reactions, Constitution of matter, Collisions (Nuclear physics)

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Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

TOLÓS RIGUEIRO, Laura, et al. K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter. Physical Review C. 2003. Vol. 68, num. 2, pags. 024903-1. ISSN 0556-2813. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/11005

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