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arXiv 1105.0334hep-phhep-th
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用么正割方法研究规范理论中的环分振幅关系

Relations of loop partial amplitudes in gauge theory by Unitarity cut method

Bo Feng, Yin Jia, Rijun Huang

摘要:

众所周知,在色分解下,胶子的单圈振幅包含单迹结构和双迹结构的振幅,特别是所有双迹结构的振幅都可以表示为单迹结构的振幅的线性组合。利用酉割方法证明了该结果是树级Kleiss-Kuijf关系的自然结果。将酉割方法推广到双环(在这种情况下是三重割),我们表明,与单环情况不同,双和三重迹结构的部分振幅不能表示为主导色单迹结构的部分振幅的线性组合。对于亚铅色单迹结构的分振幅,我们给出了六点和七点振幅的非平凡Kleiss-Kuijf关系,这是本文的一个新结果,用U(1)-解耦方法不能得到。当考虑八点情况时,对于次铅色单道分振幅,Kleiss-Kuijf关系必须修正。

英文摘要:

It is well known that under the color-decomposition, one-loop amplitude of gluons contains partial amplitudes of single and double trace structures, and particularly all partial amplitudes of double trace structure can be expressed as a linear combination of partial amplitudes of single trace structure. Using unitarity cut method, we prove that this result is the natural consequence of tree-level Kleiss-Kuijf relation. Generalizing the unitarity cut method to two-loop (triple cut in this case), we show that, unlike the one-loop case, partial amplitudes of double and triple trace structures can not be expressed as a linear combination of partial amplitudes of leading-color single trace structure. For partial amplitudes of subleading-color single trace structure, we have shown a very nontrivial Kleiss-Kuijf relation for six and seven-point amplitudes, which is one new result of our paper and can not be obtained by U(1)-decoupling method. Mysteriously, when we consider the case of eight points, Kleiss-Kuijf relation must be modified for subleading-color single trace partial amplitudes.

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