Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-02-17
JHEP 0905:046,2009
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, no figures; v2: typos corrected, references added; v3: minor changes, references added
Scientific paper
10.1088/1126-6708/2009/05/046
Tree-level scattering amplitudes in N=4 super Yang-Mills theory have recently been shown to transform covariantly with respect to a 'dual' superconformal symmetry algebra, thus extending the conventional superconformal symmetry algebra psu(2,2|4) of the theory. In this paper we derive the action of the dual superconformal generators in on-shell superspace and extend the dual generators suitably to leave scattering amplitudes invariant. We then study the algebra of standard and dual symmetry generators and show that the inclusion of the dual superconformal generators lifts the psu(2,2|4) symmetry algebra to a Yangian. The non-local Yangian generators acting on amplitudes turn out to be cyclically invariant due to special properties of psu(2,2|4). The representation of the Yangian generators takes the same form as in the case of local operators, suggesting that the Yangian symmetry is an intrinsic property of planar N=4 super Yang-Mills, at least at tree level.
Drummond James M.
Henn Johannes M.
Plefka Jan
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