Speaker
Matthias Staudacher
Description
I show how to derive the deformed Yangian invariant tree level amplitudes from the quantum inverse scattering
method. The construction naturally leads to deformed Graßmannian contour integrals. The novelty of our construction
is that the contours are fixed from the beginning. In the split helicity case the contours correspond to the
manifolds of the unitary groups, and the contour integration is just invariant Haar integration. The resulting
integrals are analytic functions of the deformation parameters as long as the scattering data is generic, i.e. stays
away from collinear configurations. This is joint work with Nils Kanning and Yumi Ko.
