Symmetries of scattering amplitudes in N=4 super Yang-Mills theory have recently been subject of great progress. The standard superconformal algebra acting on scattering amplitudes was supplemented by the discovery of dual superconformal symmetry. This finally resulted in the finding of Yangian symmetry making integrability in this branch of the gauge theory manifest. par The action of the above symmetries on scattering amplitudes bears striking resemblance to the action of spin chain operators on local gauge invariant states in N=4 SYM theory. In particular, it is necessary to deform the generators in order to deal with collinear momentum configurations. This makes the tree level symmetry exact and seems to completely fix all tree level amplitudes. In this talk we review the recent progress on symmetries of scattering amplitudes with focus
on their tree level deformations.

max plank Institut Potsdam