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arXiv · 1506.02880

Top-forms of Leading Singularities in Nonplanar Multi-loop Amplitudes

Baoyi Chen·Gang Chen·Yeuk-Kwan E. Cheung·Ruofei Xie·Yuan Xin
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Abstract

Bipartite on-shell diagrams are the latest tool in constructing scattering amplitudes. In this paper we prove that a Britto-Cachazo-Feng-Witten (BCFW)-decomposable on-shell diagram process a rational top-form if and only if the algebraic ideal comprised of the geometrical constraints is shifted linearly during successive BCFW integrations. With a proper geometric interpretation of the constraints in the Grassmannian manifold, the rational top-form integration contours can thus be obtained, and understood, in a straightforward way. All rational top-form integrands of arbitrary higher loops leading singularities can therefore be derived recursively, as long as the corresponding on-shell diagram is BCFW-decomposable.

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Baoyi Chen, Gang Chen, Yeuk-Kwan E. Cheung, Ruofei Xie, Yuan Xin. 2015-06-09. Top-forms of Leading Singularities in Nonplanar Multi-loop Amplitudes. https://arxiv.org/abs/1506.02880

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