五夸克态Θ的手征夸克模型研究(英文)

A Study of Pentaquark Θ State in Chiral Quark Model

摘要: 在手征夸克模型的框架下，研究了五夸克态 uudd的结构. 分别考虑了 Jπ=(1/2)-和Jπ=(1/2)+的各四个组态. 结果表明对于不同的模型，不论 Jπ=(1/2)-和 Jπ=(1/2)+， T=0的态的能量总是最低的. 但是最低态的能量的理论计算值仍比Θ质量的实验值高250—300 MeV.

Abstract: The structure of the pentaquark state uudd is studied in the chiral quark model. Four configurations of Jπ=(1/2)- and four of Jπ=(1/2)+ are considered. The results show that the isospin T=0 state is always the lowest one for both Jπ=(1/2)- and Jπ=(1/2)+ cases in various models. But the theoretical
value of the lowest one is still about 250 - 300 MeV higher than the experimental mass of Θ.