Dispersion Relation of δ Meson and Pion at Finite Nuclear Density in Chiral δ Model  

Dispersion Relation of σ Meson and Pion at Finite Nuclear Density in Chiral σ Model

作　　者：DONGDong-Qiao CHENWei WENDe-Hua LIULiang-Gang MasahiroNakano 

机构地区：[1]DepartmentofPhysics,ZhongshanUniversity,Guangzhou510275,China [2]DepartmentofPhysics,JinanUniversity,Guangzhou510632,China [3]DepartmentofInformationScience,UniversityofOccupationalandEnvironmentalHealth,Kitakyushu807-8555,Japan

出　　处：《Communications in Theoretical Physics》2004年第5期741-745,共5页理论物理通讯（英文版）

基　　金：国家自然科学基金，广东省科学基金

摘　　要：The propagators of pion and sigma meson at a finite nuclear density and zero temperature are studied in chiral σ model. Their dispersion relations are calculated numerically in one-loop approximation. In order to avoid the so-called tachyon pole appearing in the one-loop propagators of pion and sigma meson, we regard the mass of sigma meson mσ as a free parameter and adjust it to fit the nuclear saturation properties. For mσ equal to 3075 MeV, the tachyonpole does not appear at the normal nuclear density. Thus the dispersion relation can be calculated in chiral σ model in one-loop level for the first time.

关 键 词：dispersion relation chiral σ model tachyon pole 

分 类 号：O572.33[理学—粒子物理与原子核物理]