MHV Techniques for QED Processes

Details MHV Techniques for QED Processes MHV Techniques for QED Processes

2005-09-09

arxiv.org/abs/hep-th/0509063v2

JHEP 0511:016,2005

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, 10 figures. References added

Scientific paper

10.1088/1126-6708/2005/11/016

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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