Journal of High Energy Physics (Jul 2017)

From 4d ambitwistor strings to on shell diagrams and back

  • Joseph A. Farrow,
  • Arthur E. Lipstein

DOI
https://doi.org/10.1007/JHEP07(2017)114
Journal volume & issue
Vol. 2017, no. 7
pp. 1 – 48

Abstract

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Abstract We investigate the relation between 4d ambitwistor string theory and on-shell diagrams for planar N = 4 $$ \mathcal{N}=4 $$ super-Yang-Mills and N = 8 $$ \mathcal{N}=8 $$ supergravity, and deduce several new results about their scattering amplitudes at tree-level and 1-loop. In particular, we derive new Grassmannian integral formulae for tree-level amplitudes and obtain new world-sheet formulae for 1-loop amplitudes which are manifestly supersymmetric and supported on scattering equations refined by MHV degree.

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