强和弱Y-Y相互作用下的奇异强子物质

Strange Hadronic Matter with Strong and Weak Y-Y Interactions

把修正的夸克 介子耦合模型推广到包含奇异性的情形 ,并用来研究奇异强子物质的状态方程 .从最新的6 ΛΛHe双超核的实验导出的弱Λ Λ相互作用和过去采用的强Λ Λ相互作用同时被用于计算 .比较发现 ,具有强Λ Λ相互作用的系统束缚得比正常核物质要紧 ,而具有弱Λ Λ相互作用的系统则比正常核物质束缚得要松得多 .无论强还是弱相互作用情况 ,为了合适地描述修正的夸克 介子耦合模型中超子 超子 (Y Y)相互作用 ,必须引进σ 和介子 .

A modified quark meson coupling (MQMC) model is extended to include Λ-hyperons and Ξ-hyperons. The extended model is then used to study the equation of state (EOS) for strange hadronic matter. A weak Λ-Λ interaction deduced from recent observation of()~6_(ΛΛ)He double hypernucleus is adopted in the calculation. The resultant EOS is compared with that deduced from a strong Λ-Λ interaction. It is found that while the system with the strong Λ-Λ interaction is more deeply bound than ordinary nuclear matter due to the opening of new degrees of freedom, the system with the weak Λ-Λ interaction is rather loosely bound compared to the later. It is necessary to introduce the strange mesons σ^(*)and  in the MQMC model to describe properly the interaction between the hyperons in either strong or weak Λ-Λ interaction case.