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arXiv 0903.3526hep-th
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N=4超对称Yang-Mills理论中的高点MHV振幅

Higher point MHV amplitudes in N=4 Supersymmetric Yang-Mills Theory

C. Vergu

摘要:

本文计算了N=4超对称Yang-Mills理论中两圈七点平面MHV振幅的偶部。我们发现,偶数部分表示的保角积分与简单的合理系数。我们还计算了两个全n割的偶数部分。结果的一个重要特点是,没有六边形(或更高的多边形)循环出现在我们计算的切割检测到的积分。我们还提出了一个“腿加法规则”,它允许我们表示的一些积分系数在n+1点MHV振幅的n点MHV振幅的积分系数。

英文摘要:

We compute the even part of the two-loop seven-point planar MHV amplitude in N=4 supersymmetric Yang-Mills theory. We find that the even part is expressed in terms of conformal integrals with simple rational coefficients. We also compute the even part of two all-n cuts. An important feature of the result is that no hexagon (or higher polygon) loops appear among the integrals detected by the cuts we computed. We also present a "leg addition rule," which allows us to express some integral coefficients in the n+1-point MHV amplitude in terms of the integral coefficients of the n-point MHV amplitude.

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