Strange Hadronic Matter in a Chiral Model

¹Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800 ²Department of Physics, Fudan University, Shanghai 200433 ³Research Center of Nuclear Theory of National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000 ⁴Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039

Published Date: November 30, 2000

Abstract

The strange hadronic matter with nucleon, Λ-hyperon and Ξ-hyperon is studied by using a chiral symmetry model in a mean-field approximation. The saturation properties and stabilities of the strange hadronic matter are discussed. The result indicates a quite large strangeness fraction (fs) region where the strange hadronic matter is stable against particle emission. In the large fs region, the Ξ component dominates, resulting in a deep minimum in the curve of the binding energy per baryon E_B versus the strangeness fraction fs with (E_B, fs) ~_ (-26.0MeV,1.23).