New ambitwistor string theories

  title={New ambitwistor string theories},
  author={Eduardo Casali and Yvonne Geyer and Lionel Mason and Ricardo Monteiro and Kai A. Roehrig},
  journal={Journal of High Energy Physics},
A bstractWe describe new ambitwistor string theories that give rise to the recent amplitude formulae for Einstein-Yang-Mills, (Dirac)-Born-Infeld, Galileons and others introduced by Cachazo, He and Yuan. In the case of the Einstein-Yang-Mills amplitudes, an important role is played by a novel worldsheet conformal field theory that provides the appropriate colour factors precisely without the spurious multitrace terms of earlier models that had to be ignored by hand. This is needed to obtain the… 

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