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

作　　者：宋宏秋[1] 苏汝铿[2] 鲁定辉[3] 钱伟良[2] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]复旦大学物理系,上海200433 [3]浙江大学物理系,浙江杭州310027

出　　处：《原子核物理评论》2004年第2期137-141,共5页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(19975010;10075071;10047005;19947001;10235030);中国科学院知识创新基础研究重要方向项目(KJCX2No11)~~

摘　　要：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.

关 键 词：奇异强子物质 超子-超子相互作用 夸克-介子耦合模型 Φ介子 高能物理学 

分 类 号：O572.24[理学—粒子物理与原子核物理]