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arXiv 1209.0673hep-ph
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软虚截面的次次领头阶计算

A next-to-next-to-leading order calculation of soft-virtual cross sections

Daniel de Florian, Javier Mazzitelli

摘要:

计算了强子碰撞中无色末态过程部分子截面的次次领头阶(NNLO)软和虚QCD修正。结果对维数正则化参数$\ep$中的所有阶数都是有效的。通过对一个和两个回路振幅的有限贡献给出了结果对特定过程的依赖性。为了评估软虚近似的准确性,我们将其与Drell-Yan和希格斯玻色子玻色子通过胶子融合产生的完整NNLO结果进行比较。我们还提供了一个通用的表达式的硬系数需要执行阈值重算到下一个下一个领先的对数(NNLL)的准确性。

英文摘要:

We compute the next-to-next-to-leading order (NNLO) soft and virtual QCD corrections for the partonic cross section of colourless-final state processes in hadronic collisions. The results are valid to all orders in the dimensional regularization parameter $\ep$. The dependence of the results on a particular process is given through finite contributions to the one and two-loop amplitudes. To evaluate the accuracy of the soft-virtual approximation we compare it with the full NNLO result for Drell-Yan and Higgs boson production via gluon fusion. We also provide a universal expression for the hard coefficient needed to perform threshold resummation up to next-to-next-to-leading logarithmic (NNLL) accuracy.

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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