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        The Loop Momentum Amplituhedron

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        13130_2023_Article_20934.pdf (PDF, 358Kb)
        loop_momentum_amplituhedron_JHEP_v2.pdf (PDF, 495Kb)
        Author
        Ferro, Livia
        Łukowski, Tomasz
        Attention
        2299/26359
        Abstract
        In this paper we focus on scattering amplitudes in maximally supersymmetric Yang-Mills theory and define a long sought-after geometry, the loop momentum amplituhedron, which we conjecture to encode tree and (the integrands of) loop amplitudes in spinor helicity variables. Motivated by the structure of amplitude singularities, we define an extended positive space, which enhances the Grassmannian space featuring at tree level, and a map which associates to each of its points tree-level kinematic variables and loop momenta. The image of this map is the loop momentum amplituhedron. Importantly, our formulation provides a global definition of the loop momenta. We conjecture that for all multiplicities and helicity sectors, there exists a canonical logarithmic differential form defined on this space, and provide its explicit form in a few examples.
        Publication date
        2023-05-22
        Published in
        Journal of High Energy Physics
        Published version
        https://doi.org/10.1007/jhep05(2023)183
        Other links
        http://hdl.handle.net/2299/26359
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