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 to the spectral density reproduces the Brown et al. “broad-band equilibration” which is crucial to explain an enhanced K − / K + ratio.
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