量子强子动力学(QHD-Ⅱ)模型中核子的真空涨落对ρ介子质量的影响  

The Vacuum Fluctuation Effects on Rho Meson Mass for The QHD Ⅱ Model

作　　者：李力[1] 苏汝铿[1] 

机构地区：[1]复旦大学物理学系

出　　处：《复旦学报（自然科学版）》1999年第3期294-299,共6页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金

摘　　要：利用热场动力学和量子强子动力学（ＱＨＤ－Ⅱ）模型，计算了ρ介子的有效质量和屏蔽质量与密度的依赖关系，考察了由核子有效质量引起的真空涨落效应，证实了核子的真空涨落对ρ介子的自能修正很重要，它将导致在热密物质中ρ介子的质量减小．还比较了ＱＨＤ－Ⅱ模型和矢量－张量耦合模型，得出了在核子－核子－ρ介子的相互作用中。Based on the thermo field dynamics,the density dependent effective mass and screen mass of ρ meson have been calculated by using the Quantum Hadrodynamics(QHD Ⅱ) model.The effects of vacuum fluctuation corrections through effective nucleon mass are examined.We have shown that vacuum fluctuations of mucleons give an important correction to the self energy of the ρ meson and lead to a reduction of the ρ meson mass in hot and dense matter.The results given by the QHD Ⅱ model and by vector tensor coupling model are compared.We have found that the tensor coupling term of nucleon nucleon ρ meson interaction is important for the explanation of the recent experiment.

关 键 词：量子强子动力学 核子 QHD-Ⅱ模型 真空涨落 ρ介子质量 热场动力学 有效质量 屏蔽质量 

分 类 号：O572.243[理学—粒子物理与原子核物理] O572.339[理学—物理]