A super MHV vertex expansion for N=4 SYM theory

Details A super MHV vertex expansion for N=4 SYM theory A super MHV vertex expansion for N=4 SYM theory

2009-03-02

arxiv.org/abs/0903.0377v2

JHEP 0905:072,2009

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, 3 figures, v2: analytic expression for counting of super MHV vertex diagrams added; references added

Scientific paper

10.1088/1126-6708/2009/05/072

We present a supersymmetric generalization of the MHV vertex expansion for all tree amplitudes in N=4 SYM theory. In addition to the choice of a reference spinor, this super MHV vertex expansion also depends on four reference Grassmann parameters. We demonstrate that a significant fraction of diagrams in the expansion vanishes for a judicious choice of these Grassmann parameters, which simplifies the computation of amplitudes. Even pure-gluon amplitudes require fewer diagrams than in the ordinary MHV vertex expansion. We show that the super MHV vertex expansion arises from the recursion relation associated with a holomorphic all-line supershift. This is a supersymmetric generalization of the holomorphic all-line shift recently introduced in arXiv:0811.3624. We study the large-z behavior of generating functions under these all-line supershifts, and find that they generically provide 1/z^k falloff at (Next-to)^k MHV level. In the case of anti-MHV generating functions, we find that a careful choice of shift parameters guarantees a stronger 1/z^(k+4) falloff. These particular all-line supershifts may therefore play an important role in extending the super MHV vertex expansion to N=8 supergravity.

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