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arXiv 2102.03789hep-ph
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目标快度的扩展共线改进Balitsky-Kovchegov演化方程

Extended collinearly-improved Balitsky-Kovchegov evolution equation in target rapidity

Wenchang Xiang, Yanbing Cai, Mengliang Wang, Daicui Zhou

摘要:

通过在“实”$S$矩阵展开过程中引入运行耦合修正,导出了一个在目标快度表象下的扩展的共线改进Balitsky-Kovchegov演化方程.我们发现,运行耦合带来了重要的修正的演化方程,因为人们可以看到,有额外的贡献,一旦运行耦合的演化内核。为了确定的校正的意义,我们数值求解的演化方程与运行耦合的贡献,没有在$S$矩阵扩展。数值结果表明,运行耦合修正对散射振幅有很大的抑制作用,表明在推导目标快度表示的非线性演化方程时,需要考虑运行耦合的贡献。

英文摘要:

An extended collinearly-improved Balitsky-Kovchegov evolution equation in the target rapidity representation is derived by including the running coupling corrections during the expansion of the "real" $S$-matrix. We find that the running coupling brings important corrections to the evolution equation, as one can see that there are extra contributions to the evolution kernel once the running coupling is included. To identify the significance of the corrections, we numerically solve the evolution equation with and without the running coupling contributions during the $S$-matrix expansion. The numerical results show that the scattering amplitude is largely suppressed by the running coupling corrections, which indicate that one needs to consider the running coupling contributions during the derivation of the non-linear evolution equation in the target rapidity representation.

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