核介质中强子性质的手征σ模型研究  

Hadron Properties in Chiral Sigma Model

作　　者：申虹[1] 

机构地区：[1]南开大学物理系

出　　处：《原子核物理评论》2005年第4期376-377,381,共3页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10135030;90203004);教育部博士点基金资助项目~~

摘　　要：采用手征σ模型描述核多体系统,考虑真空极化的影响,首先由核物质的饱和性质确定模型参数,进一步研究了强子性质在核介质中的变化。手征σ模型的研究结果给出,核子和ω介子的有效质量随核物质密度的增大而减小,但σ介子的有效质量随密度的增大而增大。这些结果与不满足手征对称性的Walecka模型结果进行了比较。计算中采用的重整化方法会对结果有一定的影响。The modification of hadron masses in nuclear medium is studied by using the chiral sigma model, which is extended to generate the omega meson mass by the sigma condensation in the vacuum in the same way as the nucleon mass. The chiral sigma model provides proper equilibrium properties of nuclear matter. It is shown that the effective masses of both nucleons and omega mesons decrease in nuclear medium, while the effective mass of sigma mesons increases at finite density in the chiral sigma model. The resuits obtained in the chiral sigma model are compared with those obtained in the Walecka model, which includes sigma and omega mesons in a non-chiral fashion.

关 键 词：手征σ模型 强子有效质量 重整化方法 

分 类 号：O572.339[理学—粒子物理与原子核物理]