Inverse Soft Factors and Grassmannian Residues
arXiv:1008.3110 · doi:10.1007/JHEP01(2011)055
Abstract
The action of inverse soft factors on scattering amplitudes in N=4 SYM is shown to take a remarkably simple form in momentum twistor space. This is used to identify individual residues of the grassmannian with primitive leading singularities at NMHV and N^2MHV and to derive explicit expressions in terms of momentum twistors.
32 pages, 24 figures, Minor corrections