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arXiv 1209.2846hep-ph
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NLO多部分子过程的数值计算

Numerical evaluation of NLO multiparton processes

S. Becker, D. Goetz, C. Reuschle, C. Schwan, S. Weinzierl

摘要:

本文讨论了一种非线性光学多部分子过程的数值计算算法。在此,我们专注于非线性光学计算的虚拟部分,即在数值上评估单回路积分。我们采用和扩展的减法的想法的虚拟部分,我们使用减法项的软,共线和紫外线区域,这使我们能够评估的循环积分数值在四维。第二要素是将回路积分的积分轮廓变形到复平面中的方法。该算法是在原始振幅的水平上导出的,其中我们利用递归关系来生成相应的单回路离壳电流。我们讨论的数值行为的方法和应用程序的领先颜色的贡献,在e+ e-> n射流,与n到7。

英文摘要:

We discuss an algorithm for the numerical evaluation of NLO multiparton processes. We focus hereby on the virtual part of the NLO calculation, i.e. on evaluating the one-loop integration numerically. We employ and extend the ideas of the subtraction method to the virtual part and we use subtraction terms for the soft, collinear and ultraviolet regions, which allows us to evaluate the loop integral numerically in four dimensions. A second ingredient is a method to deform the integration contour of the loop integration into the complex plane. The algorithm is derived on the level of the primitive amplitudes, where we utilise recursive relations to generate the corresponding one-loop off-shell currents. We discuss the numerical behavior of the approach and the application to the leading colour contribution in e+ e- --> n jets, with n up to seven.

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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