核子中夸克的极化

Quark Polarization in Nucleon

根据强子张量和向前的虚光子康普顿散射振幅之间的关系，用虚光子总吸收截面表达了核子的自旋结构函数和它的第一矩，在夸克模型中计算了小动量转移区的虚光子的总吸收截面，进而得到了第一矩的理论结果，导出了质子中夸克的极化。合理地解释了ＥＭＣ和ＳＬＡＣ的实验结果。

Based on the relationship between electron induced deep inelastic scattering and forward virual photon compote scattering, the spin dependent structure function of nucleon and its first moment are expressed in terms of total absorption cross section of virtual photon which are calculated numerically in SU(6) quark model by use of helicity amplitudes. With the theoretical cross sections, the first moment of proton spin dependent structure function is predicted, and then quark polarization is deduced from the predicted moment. The experimental measurements of EMC and SLAC are reproduced thcoretically.