Chiral symmetry and strangeness at SIS energies

Abstract

In this talk we review the consequences of the chiral SU(3) symmetry for strangeness propagation in nuclear matter. Objects of crucial importance are the meson-baryon scattering amplitudes obtained within the chiral coupled-channel effective field theory. Results for antikaon and hyperon-resonance spectral functions in cold nuclear matter are presented and discussed. The importance of the Sigma(1385) resonance for the subthreshold antikaon production in heavy-ion reaction at SIS is pointed out. The in-medium properties of the latter together with an antikaon spectral function based on chiral SU(3) dynamics suggest a significant enhancement of the pi Λ-> bar K N reaction in nuclear matter.

10 pages, 2 figures, invited talk at Erice 2003

References in corpus (2)

• On meson resonances and chiral symmetry
• Antikaon production in A+A collisions at SIS energies within an off-shell G-matrix approach

Cited by in corpus (7)

• Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions
• Strangeness Balance in HADES Experiments and the Xi- Enhancement
• Influence of $\varphi$ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy
• Heavy baryonic resonances, multistrange hadrons, and equilibration at energies available at the GSI Schwerionensynchrotron, SIS18
• Strange meson production in Al+Al collisions at 1.9A GeV
• Centrality dependence of subthreshold $\varphi$ meson production in Ni+Ni collisions at 1.9A GeV
• Wide acceptance measurement of the K${}^{-}$/K${}^{+}$ ratio from Ni+Ni collisions at 1.91A GeV