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

L. Tolos; A. Polls; A. Ramos; J. Schaffner-Bielich

doi:10.1016/j.nuclphysa.2005.01.026

paper

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

arXiv:nucl-th/0312051 · doi:10.1016/j.nuclphysa.2005.01.026

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.

4 pages, 3 figures. Contributed parallel talk to the International Conference on Hypernuclear and Strange Particle Physics (HYP2003), Jefferson Lab, Newport News, Virginia (USA), Oct 14-18, 2003

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

Abstract

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