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arXiv 1004.4183hep-ph
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与单横自旋不对称性相关的夸克-胶子关联函数

Quark-gluon correlation functions relevant to single transverse spin asymmetries

Zhong-Bo Kang, Jian-Wei Qiu, Hong Zhang

摘要:

研究了核子的夸克-双夸克模型中与单横自旋不对称性有关的各种扭曲3夸克-胶子关联函数的相对大小。我们计算了负责胶子极对SSA贡献的夸克-胶子关联函数$T_{q,F}(x, x)$,以及负责费米子极贡献的$T_{q,F}(0, x)$和$T_{Δ{q}, F}(0, x)$。我们发现,在标量双夸克和轴矢量双夸克的情况下,在第一个非平凡的顺序,只有$\tq(x, x)$是有限的,而所有其他的夸克胶子关联函数消失。用同样的模型计算了夸克Sivers函数,并讨论了它与$\tq(x, x)$的关系.我们还讨论了我们的发现的含义的现象学研究的SSA。

英文摘要:

We investigate the relative size of various twist-3 quark-gluon correlation functions relevant to single transverse spin asymmetries (SSAs) in a quark-diquark model of the nucleon. We calculate the quark-gluon correlation function $T_{q,F}(x, x)$ that is responsible for the gluonic pole contribution to the SSAs, as well as $T_{q,F}(0, x)$ and $T_{Δ{q}, F}(0, x)$ responsible for the fermionic pole contributions. We find in both cases of a scalar diquark and an axial-vector diquark that at the first nontrivial order only the $\tq(x, x)$ is finite while all other quark-gluon correlation functions vanish. Using the same model, we evaluate quark Sivers function and discuss its relation to the $\tq(x, x)$. We also discuss the implication of our finding to the phenomenological studies of the SSAs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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