奇异核物质中K介子有效质量  

Effective Mass of Kaons in Hyperon-Rich Matter

作　　者：李希国[1] 刘新宇[1] 高远[2] 

机构地区：[1]中国科学院近代物理研究所 [2]杭州电子科技大学信息工程学院,杭州310037

出　　处：《高能物理与核物理》2007年第10期922-928,共7页High Energy Physics and Nuclear Physics

基　　金：中国科学院知识创新工程重点方向性项目(KJCX3-SYW-N2;KJCX2-SW-N16);国家科学自然基金(10435080;10575123)资助~~

摘　　要：在Schaffner相对论平均场模型的框架基础上,考虑同位旋矢量介子δ,扩展了强子动力学模型和单玻色子交换K介子-模型,重新讨论了介子与重子和介子与K介子相互作用的耦合常数,研究了奇异核物质中K介子的有效质量,发现在奇异核物质中K介子的有效质量随密度的变化比在纯核子物质中的变化小.同位旋矢量介子δ对在奇异核物质中K介子有效质量随密度变化有明显的影响,但对不同的参数组,其影响的大小不同.By including the scalar isovector meson 5, we extend the relativistic mean field model and the one-boson exchange model of changing K-meson in the framework of Schaffner＇s relativistic mean field model. We re-consider the coupling constants for the interactions between the meson and the baryon and the interactions of the K meson with different mesons as well in various parameter sets. Using our model, we discuss the effective masses of K mesons in the hyperon-rich nuclear matter. We find that the density modification of the K meson mass in the strange nuclear matter is smaller than that in the pure nuclear matter. The influence of the scalar isovector meson δ on the effective mass of kaon is rather evident. But the extent of the influence is different in different parameter sets.

关 键 词：K介子有效质量 奇异核物质 标量同位旋矢量介子δ 

分 类 号：O572.2[理学—粒子物理与原子核物理]