摘要
利用温度场论中的虚时格林函数方法,本文计算了三线顶角修正对有限温度下单σ介子交换势的影响。我们发现,σ介子和核子的耦合常数随温度而交小,且在温度为210 MeV时下降为零。这一结果和在夸克水平上由NambuJona-Lasinia模型给出的耦合常数随温度的变化十分类似。
By using the imaginary-time Green's function method in finite temperature field theory, we calculate the effects of the three-line vertex function on finite temperature one σ-meson exchange potential. It is found that the finite temperature coupling constant of the sigma-nucleon interaction decreases as the temperature increases, it approaches zero when temperature arrives at 210 MeV. This result is quite similar to that the temperature dependence of coupling constant given by Nambu-Jona-Lasinia model at the quark level.
出处
《高能物理与核物理》
SCIE
CAS
CSCD
北大核心
1991年第8期689-694,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
国家教委博士点基金
