论文标题
在扰动性手性夸克模型中八位骨重子的轴向过渡形式因素
Axial transition form factors of octet baryons in the perturbative chiral quark model
论文作者
论文摘要
我们研究了轴向过渡形式因子$ g_a^{b \ to b'}（q^2）$以及轴向费用$ g_a^{b \ to b'} $在扰动性chiral chiral Quark模型〜（PCQM）中的octet baryons的b'} $，其中包括与中间循环循环的传播仪中的地面和激动的状态。 $ g_a^{b \ to b'}（q^2）$上的PCQM结果和$ g_a^{b \ to b'} $与现有的实验数据和lattice-QCD值非常一致。该研究表明，对于所有过渡的$ g_a^{b \ to b'}（q^2）$以二波尔式形式表现出来，这主要由三夸克芯引起。带有地下夸克传播器的梅森云也起着极为重要的作用，但导致了平坦的贡献。激发的夸克传播器为$ g_a^{b \ to b'}（q^2）$做出了贡献，可以视为高阶校正，并且非常有限。
We study the axial transition form factors $G_A^{B\to B'}(Q^2)$ as well as the axial charges $g_A^{B\to B'}$ of the octet baryons in the perturbative chiral quark model~(PCQM) with including both the ground and excited states in the intermediate quark propagators. The PCQM results on the $G_A^{B\to B'}(Q^2)$ and the $g_A^{B\to B'}$ are found in good agreement with the existing experimental data and the lattice-QCD values. The study figures out that the $G_A^{B\to B'}(Q^2)$ for all transitions behave in the dipolelike form, which is dominantly caused by the three-quark core. The meson cloud with the ground-state quark propagator also plays an extremely important role but results in a flat contribution. The excited-state quark propagator contributing to the $G_A^{B\to B'}(Q^2)$ could be regarded as the higher order correction and it is very limited.
