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Tree-level scattering amplitudes in N=4 super Yang-Mills theory have recentlybeen shown to transform covariantly with respect to a 'dual' superconformalsymmetry algebra, thus extending the conventional superconformal symmetryalgebra psu(2,2|4) of the theory. In this paper we derive the action of thedual superconformal generators in on-shell superspace and extend the dualgenerators suitably to leave scattering amplitudes invariant. We then study thealgebra of standard and dual symmetry generators and show that the inclusion ofthe dual superconformal generators lifts the psu(2,2|4) symmetry algebra to aYangian. The non-local Yangian generators acting on amplitudes turn out to becyclically invariant due to special properties of psu(2,2|4). Therepresentation of the Yangian generators takes the same form as in the case oflocal operators, suggesting that the Yangian symmetry is an intrinsic propertyof planar N=4 super Yang-Mills, at least at tree level.

Yangian symmetry of scattering amplitudes in N=4 super Yang-Mills theory