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arXiv 2002.09492hep-phhep-th
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三圈四粒子散射d-log被积函数的构造及主积分的计算

Constructing d-log integrands and computing master integrals for three-loop four-particle scattering

Johannes Henn, Bernhard Mistlberger, Vladimir A. Smirnov, Pascal Wasser

摘要:

我们计算所有的主积分的无质量的三圈四粒子散射振幅的过程,如双射流或双光子生产在大型强子对撞机。我们提出了我们的结果中的Laurent展开的积分的维数调节器高达8 $^{\text{th}}$权力,与系数表示的谐波多项式。作为主积分的基础,我们选择只有对数极点的被积函数的积分-称为$d$对数形式。这一选择大大方便了随后的计算通过微分方程的方法。我们详细介绍了如何通过一个改进的算法最初开发的作者之一,获得这个基础。我们提供了这个算法的一个公共实现。我们解释了如何自然地应用在统一的上下文中的算法。此外,我们分类我们的$d$日志形式根据其软和共线属性。

英文摘要:

We compute all master integrals for massless three-loop four-particle scattering amplitudes required for processes like di-jet or di-photon production at the LHC. We present our result in terms of a Laurent expansion of the integrals in the dimensional regulator up to 8$^{\text{th}}$ power, with coefficients expressed in terms of harmonic polylogarithms. As a basis of master integrals we choose integrals with integrands that only have logarithmic poles - called $d$log forms. This choice greatly facilitates the subsequent computation via the method of differential equations. We detail how this basis is obtained via an improved algorithm originally developed by one of the authors. We provide a public implementation of this algorithm. We explain how the algorithm is naturally applied in the context of unitarity. In addition, we classify our $d$log forms according to their soft and collinear properties.

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