The role of three-gluon correlation functions in the single spin asymmetry
The role of three-gluon correlation functions in the single spin asymmetry
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DOI：
10.1051/epjconf/20158502012
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发表时间：
2015-01
影响因子：
0.7
通讯作者：
Hiroo Beppu;K. Kanazawa;Y. Koike;S. Yoshida
中科院分区：
文献类型：
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作者：
Hiroo Beppu;K. Kanazawa;Y. Koike;S. Yoshida
在共线因子分解的框架下，研究了twist-3三胶子对pp碰撞中轻强子产生的单自旋不对称性的贡献。我们导出了关于QCD耦合常数的首阶截面公式。我们还利用RHIC D介子产生的不对称性所暗示的三胶子关联函数模型，对RHIC能区的不对称性进行了数值计算。我们发现，轻强子和喷注产生的不对称性对约束关联函数的大小和形式是非常有用的。由于三胶子关联函数使各种强子的不对称性向同一方向移动，因此它们不可能成为不对称性的主要来源。
We study the twist-3 three-gluon contribution to the single spin asymmetry in the light-hadron pro- duction in pp collision in the framework of the collinear factorization. We derive the corresponding cross section formula in the leading order with respect to the QCD coupling constant. We also present a numerical calcula- tion of the asymmetry at the RHIC energy, using a model for the three-gluon correlation functions suggested by the asymmetry for the D-meson production at RHIC. We found that the asymmetries for the light-hadron and the jet productions are very useful to constrain the magnitude and form of the correlation functions. Since the three-gluon correlation functions shift the asymmetry for all kinds of hadrons in the same direction, it is unlikely that they become a main source of the asymmetry.