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arXiv 1012.1064hep-ph
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用pp \to DX探测扭曲3多胶子关联函数

Probing the twist-3 multi-gluon correlation functions by pp \to DX

Yuji Koike, Shinsuke Yoshida

备注：
to appear in the proceedings of the 19th International Spin Physics Symposium (Spin2010), Sept.27 - Oct.2, 2010, Juelich, Germany, 5 pages, 2 figures
发表信息：
J.Phys.Conf.Ser.295:012083,2011
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摘要：

在共线因子分解的框架下，研究了$pp$碰撞中D介子产生$A_N^D$的单自旋不对称性，即$p^\uparrow p\to DX$。由于粲夸克主要是通过胶子熔合过程中的$c\bar{c}$对产生的，因此这是探测极化核子中扭曲3三胶子关联函数的理想过程。我们推导了相应的截面公式的三胶子关联函数的贡献$A_N^D$在$p^\uparrow p\to DX$，应用我们以前的研究中开发的方法$ep^\uparrow\to eDX$。在$ep^\uparrow\to eDX$的情况下，我们的结果不同于文献中以前的研究。我们还将根据RHIC对$A_N^D$的初步数据给出三胶子关联函数的简单估计。

英文摘要：

We study the single spin asymmetry (SSA) for the D-meson production $A_N^D$ in the $pp$ collision, $p^\uparrow p\to DX$, in the framework of the collinear factorization. Since the charm quark is mainly produced through the $c\bar{c}$-pair creation from the gluon-fusion process, this is an ideal process to probe the twist-3 triple-gluon correlation functions in the polarized nucleon. We derive the corresponding cross section formula for the contribution of the triple-gluon correlation function to $A_N^D$ in $p^\uparrow p\to DX$, applying the method developed for $ep^\uparrow\to eDX$ in our previous study. As in the case of $ep^\uparrow\to eDX$, our result differs from a previous study in the literature. We will also present a simple estimate of the triple-gluon correlation functions based on the preliminary data on $A_N^D$ by RHIC.

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