Kaons and antikaons in asymmetric nuclear matter

TL;DR

This paper investigates how kaons and antikaons behave in asymmetric nuclear matter using a chiral SU(3) model, highlighting medium modifications relevant for heavy ion collision experiments and future accelerator facilities.

Contribution

It introduces a detailed chiral SU(3) model to analyze medium modifications of kaons and antikaons in asymmetric nuclear matter, including parameter fitting and comparison with existing data.

Findings

Density dependence of kaon and antikaon optical potentials is significant.

Model parameters fitted to nuclear matter saturation properties and scattering lengths.

Results are relevant for upcoming experiments at FAIR with neutron-rich beams.

Abstract

The properties of kaons and antikaons and their modification in isospin asymmetric nuclear matter are investigated using a chiral SU(3) model. These isospin dependent medium effects are important for asymmetric heavy ion collision experiments. In the present work, the medium modifications of the energies of the kaons and antikaons, within the asymmetric nuclear matter, arise due to the interactions of kaons and antikaons with the nucleons and scalar mesons. The values of the parameters in the model are obtained by fitting the saturation properties of nuclear matter and kaon-nucleon scattering lengths. The pion-nucleon scattering lengths are also calculated within the chiral effective model and compared with earlier results from the literature. The density dependence of the isospin asymmetry is seen to be appreciable for the kaon and antikaon optical potentials. This can be particularly relevant for the future accelerator facility FAIR at GSI, where experiments using neutron rich beams are planned to be used in the study of compressed baryonic matter.