Igor Prlina, Marcus Spradlin, James Stankowicz, Stefan Stanojevic, Anastasia Volovich
Published 2017-11-30Version 1
We review an algorithm for determining the branch points of general amplitudes in planar $\mathcal{N}=4$ super-Yang-Mills theory from amplituhedra. We demonstrate how to use the recent reformulation of amplituhedra in terms of `sign flips' in order to streamline the application of this algorithm to amplitudes of any helicity. In this way we recover the known symbol alphabets of all one-loop amplitudes, and we find an `emergent positivity' on boundaries of amplituhedra.
Comments: 37 pages, 5 figures, 1 big table
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