夸克蜕定域色屏蔽模型研究Σ_c(2800)和Λ_c(2940)

Study of Σ_c(2 800) and Λ_c(2 940) States in the Quark Delocalization Color Screening Model

在夸克蜕定域色屏蔽模型框架下,利用共振群方法研究了同位旋为I=0和I=1,角动量为J^P=1/2±,3/2±,5/2±的分子态ND体系,发现所有的正宇称态都不束缚.经过多道耦合计算,我们得到了I=0,J^P=1/2^-的ND分子态,可以用来解释实验上报道的Σ_c(2 800),I=0,J^P=3/2^-的ND~*分子态可以解释实验报道的Λ_c(2 940),另外还存在一个I=1,J^P=5/2^-的ΔD~*分子态.

The ND systems with I=0 and I=1,J P=1 2±,3 2±,5 2±are dynamically investigated within the framework of the quark delocalization color screening model.The results show that by the channel-coupling calculation,there is a ND bound state with I=0,J P=1 2-,which can be used to explain the reportedΣc(2 800);a ND*bound state with I=0,J P=3 2-is obtained,which can be used to explain the reportedΛc(2 940).Besides,another bound stateΔD*with I=1,J P=5 2-is also obtained.