Pentaquark^+的介质效应

In-Medium Effect of Pentaquark (?)^+ in the Density Dependent Relativistic Hadron Field Theory

在密度相关的相对论平均场理论基础上,假定^+通过交换有效的同位旋标量介子σ和ω与其他重子发生相互作用,研究了强子在包含^+的奇异核物质中的性质改变。讨论并计算了介质中的^+和核子有效质量及其对重子密度的依赖关系,分析了^+在核物质中包含的成分大小以及核子的同位旋效应对奇异核物质性质的影响,进一步计算了不同重子组成比例下奇异核物质的标量密度ρ_S和矢量密度ρ_B的对应曲线。

The density dependent relativistic hadron field theory is extended to inclusions of pentaquark Θ^＋＋. We have investigated the mass modifications of nucleons and pentaquark Θ^＋ in the framework of relativistic mean field theory. We find that the effective mass, of either the nucleon or the pentaquark Θ^＋ decreases as baryon density increases. We have studied the effects of the fractions of Θ^＋ and neutron on the baryon masses. We also discussed the relations between scale density ρs and vector density ρB at different baryon fractions.