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arXiv 1208.0190hep-th
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单环路放大器的复分解和递归

Complex Factorisation and Recursion for One-Loop Amplitudes

Sam D. Alston, David C. Dunbar, Warren B. Perkins

摘要:

我们考虑在复杂的运动学点的单圈振幅的因式分解。通过确定实运动学中缺少的项,我们可以为无质量理论中单圈振幅的纯有理部分构造一个递归的解析式。我们通过对杨-米尔斯理论中单负一圈振幅的Bern等人的n点解的验证和对一圈五个引力子MHV散射振幅的标量贡献的构造来说明这种方法。

英文摘要:

We consider the factorisation of one-loop amplitudes at complex kinematic points. By determining the terms that are absent for real kinematics, we can construct a recursive ansatz for the purely rational pieces of one-loop amplitudes in massless theories. We illustrate this method by verifying the Bern et.al. n-point ansatze for the single-minus one-loop amplitudes in Yang-Mills theory and by constructing the scalar contribution to the one-loop five graviton MHV scattering amplitude.

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