Boundaries of amplituhedra and NMHV symbol alphabets at two loops
Abstract
In this sequel to [3] we classify the boundaries of amplituhedra relevant for determining the branch points of general two-loop amplitudes in planar N=4 super-Yang-Mills theory. We explain the connection to on-shell diagrams, which serves as a useful cross-check. We determine the branch points of all two-loop NMHV amplitudes by solving the Landau equations for the relevant configurations and are led thereby to a conjecture for the symbol alphabets of all such amplitudes.
- Publication:
-
Journal of High Energy Physics
- Pub Date:
- April 2018
- DOI:
- 10.1007/JHEP04(2018)049
- arXiv:
- arXiv:1712.08049
- Bibcode:
- 2018JHEP...04..049P
- Keywords:
-
- Scattering Amplitudes;
- Supersymmetric Gauge Theory;
- High Energy Physics - Theory
- E-Print:
- 42 pages, 6 figures, 8 tables