MHV techniques for QED processes
Kemal J. Ozeren; W. James Stirling
Журнал:
Journal of High Energy Physics
Дата:
2005-11-01
Аннотация:
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<sup>+</sup>e<sup>−</sup>nγ. 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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