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arXiv 1902.07205hep-thhep-ph
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构造$\mathcal{N}=4$库仑支超级振幅

Constructing $\mathcal{N}=4$ Coulomb Branch Superamplitudes

Aidan Herderschee, Seth Koren, Timothy Trott

摘要:

利用大质量粒子的群协变壳层超空间,研究了大质量BPS态在$4d$ $\mathcal{N}=4$ super-Yang-Mills的库仑支上的散射振幅.构造了大质量振幅的Super-BCFW递推公式,并证明了它对所有库仑支超振幅的有效性。然后,我们确定了大质量态的三粒子超振幅。这些成分使我们能够显式计算四粒子和五粒子的超级振幅,这是第一次非平凡的使用BCFW递归振幅与完全大规模的外部状态。明显的小群协方差有助于阐明BPS态特殊运动学性质的作用和超振幅的组织结构。

英文摘要:

We study scattering amplitudes of massive BPS states on the Coulomb branch of $4d$ $\mathcal{N}=4$ super-Yang-Mills, utilising a little group covariant on-shell superspace for massive particles. Super-BCFW recursion for massive amplitudes is constructed and its validity is proven for all Coulomb branch superamplitudes. We then determine the exact three-particle superamplitudes for massive states. These ingredients allow us to explicitly compute the four- and five-particle superamplitudes, which is the first non-trivial usage of BCFW recursion for amplitudes with entirely massive external states. The manifest little group covariance helps clarify both the role of special kinematic properties of BPS states and the organizational structures of the superamplitudes.

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