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On the classification of residues of the Grassmannian
Journal of High Energy Physics
We study leading singularities of scattering amplitudes which are obtained as residues of an integral over a Grassmannian manifold. We recursively do the transformation from twistors to momentum twistors and obtain an iterative formula for Yangian invariants that involves a succession of dualized twistor variables. This turns out to be useful in addressing the problem of classifying the residues of the Grassmannian. The iterative formula leads naturally to new coordinates on the Grassmannian indoi:10.1007/jhep10(2011)097 fatcat:rqs352mqnbbftfpirly4n7dcn4