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arXiv 1408.4546hep-ph
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NNLO QCD在大$N_F$限值中对$pp \to γ^* γ^*$的校正

NNLO QCD corrections to $pp \to γ^* γ^*$ in the large $N_F$ limit

Charalampos Anastasiou, Julian Cancino, Federico Chavez, Claude Duhr, Achilleas Lazopoulos, Bernhard Mistlberger, Romain Mueller

摘要:

本文计算了在大量夸克味的限制下,一对离壳层光子的强子产生的NNLO QCD修正。我们执行减少的两个回路的振幅,以掌握积分,并计算后者分析作为一个Laurent系列的尺寸调节器,使用现代集成方法。真实的辐射校正数值计算直接减去红外线的限制,我们投在一个简单的因式分解的形式。这里给出的结果构成了完整的NNLO修正的规范不变部分,但不一定占主导地位。我们认为这种计算是迈向完整计算的一步。我们对总截面的部分修正约为$1\%-3\%$,并随两个离壳层光子的虚性而变化。

英文摘要:

We compute the NNLO QCD corrections for the hadroproduction of a pair of off-shell photons in the limit of a large number of quark flavors. We perform a reduction of the two-loop amplitude to master integrals and calculate the latter analytically as a Laurent series in the dimensional regulator using modern integration methods. Real radiation corrections are evaluated numerically with a direct subtraction of infrared limits which we cast in a simple factorized form. The results presented here constitute a gauge invariant part of the full NNLO corrections but are not necessarily dominant. We view this calculation as a step towards a complete computation. Our partial corrections to the total cross-section are about $1\%-3\%$ and vary with the virtuality of the two off-shell photons.

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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