In-medium properties of antikaons at finite temperature: the K^-/K^+ ratio at GSI

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dc.creatorTolos, L.
dc.creatorSchaffner-Bielich, J.
dc.creatorPolls, A.
dc.creatorRamos, A.
dc.date2004-07-12
dc.date2004-07-13
dc.date.accessioned2026-07-07T05:40:27Z
dc.date.available2026-07-07T05:40:27Z
dc.descriptionThe $K^-/K^+$ ratio in heavy-ion collisions at GSI is studied including the properties of the participating hadrons in hot and dense matter, paying a particular attention to the in-medium properties of antikaons at finite temperature. The determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio $K^-/K^+$ is very delicate, and depends on the approach adopted for the antikaon self-energy. Different approaches for the $K^-$ self-energy have been considered: non-interacting $K^-$, on-shell self-energy and single-particle spectral density. We observe that the use of an energy dependent $\bar{K}$ spectral density lowers considerably the freeze-out temperature with respect to the on-shell approach. We also conclude that the full off-shell approach gives rise to the "broad-band equilibration" advocated by Brown, Rho and Song.
dc.description8 pages, 5 figures, talk given at XLII International Meeting on Nuclear Physics (Bormio, Italy), 25-31 January 2004
dc.identifierhttps://arxiv.org/abs/nucl-th/0407035
dc.identifierhttp://arxiv.org/abs/nucl-th/0407035
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/82259
dc.subjectNuclear Theory
dc.titleIn-medium properties of antikaons at finite temperature: the K^-/K^+ ratio at GSI
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