A Grassmannian Etude in NMHV Minors

Details A Grassmannian Etude in NMHV Minors A Grassmannian Etude in NMHV Minors

2009-12-18

arxiv.org/abs/0912.3705v2

Physics

High Energy Physics

High Energy Physics - Theory

17 pages

Scientific paper

Arkani-Hamed, Cachazo, Cheung and Kaplan have proposed a Grassmannian formulation for the S-matrix of N=4 Yang-Mills as an integral over link variables. In parallel work, the connected prescription for computing tree amplitudes in Witten's twistor string theory has also been written in terms of link variables. In this paper we extend the six- and seven-point results of arXiv:0909.0229 and arXiv:0909.0499 by providing a simple analytic proof of the equivalence between the two formulas for all tree-level NMHV superamplitudes. Also we note that a simple deformation of the connected prescription integrand gives directly the ACCK Grassmannian integrand in the limit when the deformation parameters equal zero.

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