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arXiv 1109.6293hep-phnucl-th
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色偶极模型中的线极化胶子分布

On the linearly polarized gluon distributions in the color dipole model

Fabio Dominguez, Jian-Wei Qiu, Bo-Wen Xiao, Feng Yuan

摘要:

我们发现,线性极化胶子分布出现在色偶极模型中,我们得到的DIS dijet生产和Drell-Yan dijet($γ^*$喷流关联)过程的全截面。与正常的Weizsäcker-Williams胶子分布一起,线性极化胶子分布将作为关联极限中$\cos(2 Δϕ) $项的系数贡献于DIS双喷流产生截面。我们还得到了Drell-Yan双喷过程的截面的精确结果,发现线极化偶极胶子分布与正常偶极胶子分布相同,也包含在该截面中.所得结果与前人的横动量因子分解结果一致。我们进一步导出了这些线极化胶子分布的小$x$演化,发现它们在高能时随着$x$变小而升高。

英文摘要:

We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet ($γ^*$ jet correlation) process. Together with the normal Weizsäcker-Williams gluon distribution, the linearly polarized one will contribute to the DIS dijet production cross section as the coefficient of the $\cos(2 Δϕ) $ term in the correlation limit. We also derive the exact results for the cross section of the Drell-Yan dijet process, and find that the linearly polarized dipole gluon distribution which is identical to the normal dipole gluon distribution involves in the cross section. The results obtained in this paper agree with the previous transverse momentum dependent factorization study. We further derive the small-$x$ evolution of these linearly polarized gluon distributions and find that they rise as $x$ gets small at high energy.

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