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An approximate approach to the nonlinear DGLAP evaluation equation

机译:非线性DGLAP评估方程的一种近似方法

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摘要

We determined the effects of the first nonlinear corrections to the gluon distribution using the solution of the QCD nonlinear Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (NLDGLAP) evolution equation at small x. By using a Laplace-transform technique, the behavior of the gluon distribution is obtained by solving the Gribov, Levin, Ryskin, Mueller and Qiu (GLR-MQ) evolution equation with the nonlinear shadowing term incorporated. We show that the strong rise that is corresponding to the linear QCD evolution equations at small x can be tamed by screening effects. Consequently, the nonlinear effects for the gluon distributions are calculated and compared with the results for the integrated gluon density from the Balitsky-Kovchegov (BK) equation. The resulting analytic expression allows us to predict the shadowing correction to the logarithmic derivative F (2)(x, Q (2)) with respect to ln Q (2) and to compare the results with H1 data and a QCD analysis fit.
机译:我们使用QCD非线性Dokshitzer-Gribov-Lipatov-Altarelli-Parisi(NLDGLAP)演化方程在小x处的解确定了首次非线性校正对胶子分布的影响。通过使用拉普拉斯变换技术,可以通过结合了非线性阴影项的Gribov,Levin,Ryskin,Mueller和Qiu(GLR-MQ)演化方程来求解胶子分布的行为。我们表明,与小Q处的线性QCD演化方程相对应的强势上升可以通过屏蔽效应来抑制。因此,计算了胶子分布的非线性效应,并将其与来自Balitsky-Kovchegov(BK)方程的胶子密度积分结果进行了比较。所得的解析表达式使我们能够预测相对于ln Q(2)的对数导数F(2)(x,Q(2))的阴影校正,并将结果与​​H1数据和QCD分析拟合进行比较。

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