In-medium effects on the $K^-/K^+$ ratio at GSI

Details In-medium effects on the $K^-/K^+$ ratio at GSI In-medium effects on the $K^-/K^+$ ratio at GSI

2003-12-15

arxiv.org/abs/nucl-th/0312051v2

Nucl.Phys. A754 (2005) 356-360

Physics

Nuclear Physics

Nuclear Theory

4 pages, 3 figures. Contributed parallel talk to the International Conference on Hypernuclear and Strange Particle Physics (HY

Scientific paper

10.1016/j.nuclphysa.2005.01.026

The in-medium modifications on the $K^-/K^+$ ratio produced at GSI are studied. Particular attention is paid to the properties of antikaons, which determine the chemical potential and temperature at freeze-out conditions. Different approaches have been considered: non-interacting $K^-$, on-shell self-energy and single-particle spectral density. We observe that the full off-shell approach reproduces the "broad-band equilibration" advocated by Brown being the spectral density crucial to explain an enhanced $K^-/K^+$ ratio.

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