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MHV Techniques for QED Processes
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Significant progress has been made in the past year in developing new `MHV' techniques for calculating multiparticle scattering amplitudes in Yang-Mills gauge theories. Most of the work so far has focussed on applications to Quantum Chromodynamics, both at tree and one-loop level. We show how such techniques can also be applied to abelian theories such as QED, by studying the simplest tree-level multiparticle process, e^+e^- to n \gamma. We compare explicit results for up to n=5 photons using both the Cachazo, Svrcek and Witten `MHV rules' and the related Britto-Cachazo-Feng `recursion relation' approaches with those using traditional spinor techniques.
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Soft Factor Structure of MHV Amplitudes for Massless Charged Particles
MHV amplitudes in massless QED are derived in a factorized soft-factor form, with proof by BCFW recursion, extending to scalars, supersymmetry, and gravity up to eight points.
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