强和弱Y-Y相互作用下的奇异强子物质
Strange Hadronic Matter with Strong and Weak YY Interactions
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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6ΛΛHe双超核的实验导出的弱ΛΛ相互作用和过去采用的强ΛΛ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ΛΛ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(YY)相互作用, 必须引进σ*和介子.
A modified quark meson coupling (MQMC) model is extended to include Λhyperons and Ξhyperons. The extended model is then used to study the equation of state (EOS) for strange hadronic matter. A weak ΛΛ interaction deduced from recent observation of 6ΛΛHe double hypernucleus is adopted in the calculation. The resultant EOS is compared with that deduced from a strong ΛΛ interaction. It is found that while the system with the strong ΛΛ interaction is more deeply bound than ordinary nuclear matter due to the opening of new degrees of freedom, the system with the weak ΛΛ 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 ΛΛ interaction case.
Abstract: A modified quark meson coupling (MQMC) model is extended to include Λhyperons and Ξhyperons. The extended model is then used to study the equation of state (EOS) for strange hadronic matter. A weak ΛΛ interaction deduced from recent observation of 6ΛΛHe double hypernucleus is adopted in the calculation. The resultant EOS is compared with that deduced from a strong ΛΛ interaction. It is found that while the system with the strong ΛΛ interaction is more deeply bound than ordinary nuclear matter due to the opening of new degrees of freedom, the system with the weak ΛΛ 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 ΛΛ interaction case.