两重子体系夸克效应的分析

An Analysis of Quark Effect in Two Baryon System

通过对两重子集团间夸克交换项的分析指出 ,两重子系统的夸克效应是两集团靠得很近时 ,并在相对运动的低次波 (S波 )中才能充分表现出来 .对给定的两重子态其夸克效应的性质由自旋、味道和色空间置换算符在该态的矩阵元决定 .有些自旋 -味道状态 ,Pauli堵塞效应很严重 ,必然存在着很强的排斥心 ;另一些自旋 -味道状态 ,夸克交换效应有助于把两个重子“融合”到一起 ,从而形成双重子态 .因此 。

The quark effect in the two baryon systems is studied by making an analysis of the quark exchange terms. The results point out that the quark effect becomes visible only when the two baryon clusters are close to each other. So its influence is much more important in the S waves than in P waves, and the expectation value of the permutation operator in the spin-flavor-color space plays significant role. For some spin-flavor states, the Pauli Blocking Effect is very serious, there should be a big repulsive core radius between these two baryons. But for some other spin-flavor states, the quark exchange effect is favorable for mixing the two baryon clusters together to form dibaryon. Therefore the data of the phase shifts of the baryon-baryon scattering and the binding energies of the two baryon systems are cardinal in examining the quark effect.