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arXiv 1906.06138hep-ph
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多回路数值积分的回路树对偶

Loop Tree Duality for multi-loop numerical integration

Zeno Capatti, Valentin Hirschi, Dario Kermanschah, Ben Ruijl

摘要:

Loop Tree Duality(LTD)为直接在动量空间中对多圈积分进行数值积分提供了一条很有前途的途径。它在一个循环中得到了很好的建立,但在两个循环中只有稀疏的数值结果。我们提供了一个新的多回路LTD表达式的形式推导,并研究其阈值奇异结构。我们将我们的研究结果数值上的一组不同的多达四个循环的有限拓扑运动学,没有轮廓变形是必要的。我们也为构造这样的变形打下了基础。我们的研究结果作为一个重要的垫脚石,对一个普遍的和有效的数值实现有限公司,适用于计算的虚拟修正。

英文摘要:

Loop Tree Duality (LTD) offers a promising avenue to numerically integrate multi-loop integrals directly in momentum space. It is well-established at one loop, but there have been only sparse numerical results at two loops. We provide a formal derivation for a novel multi-loop LTD expression and study its threshold singularity structure. We apply our findings numerically to a diverse set of up to four-loop finite topologies with kinematics for which no contour deformation is needed. We also lay down the ground work for constructing such a deformation. Our results serve as an important stepping stone towards a generalised and efficient numerical implementation of LTD, applicable to the computation of virtual corrections.

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