Prescriptive Unitarity from Positive Geometries

Livia Ferro, Ross Glew, Tomasz Lukowski, Jonah Stalknecht

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In this paper, we define the momentum amplituhedron in the four-dimensional split-signature space of dual momenta. It encodes scattering amplitudes at tree level and loop integrands for N=4 super Yang-Mills in the planar sector. In this description, every point in the tree-level geometry is specified by a null polygon. Using the null structure of this kinematic space, we find a geometry whose canonical differential form produces loop-amplitude integrands. Remarkably, at one loop it is a curvy version of a simple polytope, whose vertices are specified by maximal cuts of the amplitude. This construction allows us to find novel formulae for the one-loop integrands for amplitudes with any multiplicity and helicity. The formulae obtained in this way agree with the ones derived via prescriptive unitarity. It makes prescriptive unitarity naturally emerge from this geometric description.
Original languageEnglish
Article number1
Pages (from-to)1-41
Number of pages41
JournalJournal of High Energy Physics (JHEP)
Issue number3
Early online date1 Mar 2024
Publication statusPublished - 1 Mar 2024


  • hep-th
  • Scattering Amplitudes
  • Supersymmetric Gauge Theory


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