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arXiv 0902.1112hep-ph
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非线性QCD满足数据:具有运行耦合BK演化的轻子-质子散射的整体分析

Non-linear QCD meets data: A global analysis of lepton-proton scattering with running coupling BK evolution

J. L. Albacete, N. Armesto, J. G. Milhano, C. A. Salgado

摘要:

我们对在轻子-质子实验中测得的结构函数F_2进行了全局拟合,得到了小的Bjorken-x值,x \le 0.01,以及所有实验得到的Q^2值,0.045 GeV^2 \le Q^2 \le 800 GeV^2。我们表明,最近的改进,包括运行耦合校正允许非线性QCD演化方程的数据描述。在这种方法中,F_2是在偶极子模型内计算的,所有的Bjorken-x依赖性由运行耦合Balitsky-Kovchegov方程描述。我们使用了两种不同的初始条件来进行演化,这两种初始条件都能很好地拟合具有χ^2/d.o.f.的数据。<1.1。未包括在拟合中的质子纵向结构函数F_L的数据也得到了很好的描述。我们对未来对撞机和超高能宇宙射线感兴趣的运动学区域的F_2和F_L进行了预测。我们的分析允许执行质子偶极子散射振幅的第一原理外推。我们的结果的数值实现到x=10^{-12}作为计算机代码发布供公众使用。

英文摘要:

We perform a global fit to the structure function F_2 measured in lepton-proton experiments at small values of Bjorken-x, x\le 0.01, for all experimentally available values of Q^2, 0.045 GeV^2\le Q^2 \le 800 GeV^2. We show that the recent improvements resulting from the inclusion of running coupling corrections allow for a description of data in terms of non-linear QCD evolution equations. In this approach F_2 is calculated within the dipole model with all Bjorken-x dependence described by the running coupling Balitsky-Kovchegov equation. Two different initial conditions for the evolution are used, both yielding excellent fits to data with χ^2/d.o.f.<1.1. Data for the proton longitudinal structure function F_L, not included in the fits, are also well described. We provide predictions for F_2 and F_L in the kinematical regions of interest for future colliders and ultra-high energy cosmic rays. Our analysis allows to perform a first principle extrapolation of the proton-dipole scattering amplitude. A numerical implementation of our results down to x=10^{-12} is released as a computer code for public use.

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