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arXiv 1607.00832hep-ph
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CGC/饱和方法:一个新的次首阶扰动QCD碰撞参量依赖模型

CGC/saturation approach: a new impact-parameter dependent model in the next-to-leading order of perturbative QCD

Carlos Contreras, Eugene Levin, Rodrigo Meneses, Irina Potashnikova

摘要:

本文首次尝试利用QCD中线性和非线性演化的次高阶修正建立CGC/饱和模型。我们假设重整化尺度是饱和动量,发现散射振幅在饱和区域深处具有几何标度行为,并给出了这种行为在大$τ= r^2 Q^2_s$下的显式表达式.我们建立了一个模型,包括这种行为,以及已知的成分:(i)使用NLO BFKL核在饱和动量附近的散射振幅的行为,(ii)作为$Y$的函数的$\ln\Lb Q^2_s\Lb Y \Rb\Rb$的预渐近行为,以及(iii)饱和动量的碰撞参量行为,该模型在大$b$下具有指数行为$\propto \exp\Lb -\, m\, b\Rb$.我们证明了该模型能够描述深部非弹性结构函数的实验数据.尽管如此,我们的模型有困难,这是与小值的QCD耦合在$Q_s\Lb Y_0\Rb$和大值的饱和动量,这表明我们的描述的理论不一致。

英文摘要:

This paper is the first attempt to build CGC/saturation model based on the next-to-leading order corrections to linear and non-linear evolution in QCD. We assume that the renormalization scale is the saturation momentum and found that the scattering amplitude has geometric scaling behaviour deep in the saturation domain with the explicit formula of this behaviour at large $τ= r^2 Q^2_s$. We built a model that include this behaviour, as well as the ingredients that has been known: (i) the behaviour of the scattering amplitude in the vicinity of the saturation momentum, using the NLO BFKL kernel, (ii) the pre-asymptotic behaviour of $\ln\Lb Q^2_s\Lb Y \Rb\Rb$, as function of $Y$ and (iii) the impact parameter behaviour of the saturation momentum, which has exponential behaviour $\propto \exp\Lb -\, m\, b\Rb$ at large $b$.We demonstrated that the model is able to describe the experimental data for the deep inelastic structure function. Despite this, our model has difficulties that are related to the small value of the QCD coupling at $Q_s\Lb Y_0\Rb$ and the large values of the saturation momentum, which indicate the theoretical inconsistency of our description.

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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