title: Twistors and amplitudes.
abstract: A brief review is given of why twistor geometry has taken a central place in the theory of scattering amplitudes for fundamental particles. The emphasis is on the twistor diagram formalism as originally proposed by Penrose, the development of which has now led to the definition by Arkani-Hamed et al. of the 'amplituhedron'.
authors.affiliation: Mathematical Institute, University of Oxford, Radcliffe Observatory Quarter, Woodstock Road, Oxford OX2 6GG, UK hodges@maths.ox.ac.uk.
authors.forename: Andrew
authors.initials: A
authors.lastname: Hodges
keywords: amplituhedron; scattering amplitudes; twistor theory