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