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arXiv 1606.07640hep-th
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多Regge三圈符号的系统学

Systematics of the Multi-Regge Three-Loop Symbol

Till Bargheer

摘要:

我们回顾了Mandelivery切割对多Regge极限下平面散射振幅的贡献。隔离相关的切割条款,我们解释了如何BFKL展开可以用来构建扰动的n点多Regge极限振幅在某些运动区域从有限数量的基本积木。在三个循环和前导对数阶时,需要两个构建块。它们的符号是从已知的一般运动学的三环六点和七点符号中提取出来的。新的七点构建块的单值多个多项式的程度上,它可以确定使用的符号,以及进一步的对称性和一致性约束。在前导对数阶之外,子前导项和子子前导项分别需要两个和一个进一步的构建块。后者可以从进一步的微扰数据重建,或从BFKL积分涉及尚未未知的校正中央发射块。

英文摘要:

We review the systematics of Mandelstam cut contributions to planar scattering amplitudes in the multi-Regge limit. Isolating the relevant cut terms, we explain how the BFKL expansion can be used to construct the perturbative n-point multi-Regge limit amplitude in certain kinematic regions from a finite number of basic building blocks. At three loops and at leading logarithmic order, two building blocks are required. Their symbols are extracted from the known three-loop six-point and seven-point symbols for general kinematics. The new seven-point building block is constructed in terms of single-valued multiple polylogarithms to the extent it can be determined using the symbol as well as further symmetry and consistency constraints. Beyond the leading logarithmic order, the subleading and sub-subleading terms require two and one further building block, respectively. The latter could either be reconstructed from further perturbative data, or from BFKL integrals involving yet-unknown corrections to the central emission block.

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