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arXiv 0908.0684hep-th
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N=4超Yang-Mills的五维散射

Scattering into the fifth dimension of N=4 super Yang-Mills

Luis F. Alday, Johannes M. Henn, Jan Plefka, Theodor Schuster

摘要:

我们研究了N=4的超杨-米尔斯理论中平面散射振幅的量纲正则化的另一种方法。红外发散由希格斯机制获得的质量调节,使我们能够在四维中工作。相应的弦论设置表明,振幅具有精确的对偶共形对称性。后者作用于振幅的运动学变量以及有效的五维空间中的希格斯质量。我们通过规范理论中的一个明确计算证实了这一预期。这种精确的对偶共形对称的结果是允许出现在振幅中的标量基积分的显著减少的集合。例如,三角形子图被排除。我们认为,幂的振幅的研究是简单的希格斯德理论,因为在质量调节器中的倏逝项可以一贯下降。我们通过将四点振幅取幂为两个循环来说明这一点。最后,我们还解析计算了具有内部质量的双环主积分的小质量展开。

英文摘要:

We study an alternative to dimensional regularisation of planar scattering amplitudes in N=4 super Yang-Mills theory by going to the Coulomb phase of the theory. The infrared divergences are regulated by masses obtained from a Higgs mechanism, allowing us to work in four dimensions. The corresponding string theory set-up suggests that the amplitudes have an exact dual conformal symmetry. The latter acts on the kinematical variables of the amplitudes as well as on the Higgs masses in an effectively five dimensional space. We confirm this expectation by an explicit calculation in the gauge theory. A consequence of this exact dual conformal symmetry is a significantly reduced set of scalar basis integrals that are allowed to appear in an amplitude. For example, triangle sub-graphs are ruled out. We argue that the study of exponentiation of amplitudes is simpler in the Higgsed theory because evanescent terms in the mass regulator can be consistently dropped. We illustrate this by showing the exponentiation of a four-point amplitude to two loops. Finally, we also analytically compute the small mass expansion of a two-loop master integral with an internal mass.

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