2009/12/20 by Dhritiman Nandan, Anastasia Volovich, Congkao Wen
Mathematics · Physics and Astronomy · #Algebraic structures and combinatorial models #Black Holes and Theoretical Physics #Equivalence (formal languages) #Grassmannian #Quantum Chromodynamics and Particle Interactions #Simple (philosophy) #String (physics) #Tree (set theory) #Twistor theory #hep-th
paper · pdf · doi:10.1007/jhep07(2010)061
published as JHEP 1007:061,2010 · 17 pages
arxiv created 2009/12/20 · openalex publication_date 2010/07/01 · arxiv updated 2014/11/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.