Simplicity in the structure of QED and gravity amplitudes

@inproceedings{Badger2008SimplicityIT,
title={Simplicity in the structure of QED and gravity amplitudes},
author={Simon Badger and Nina Bohr},
year={2008}
}

We investigate generic properties of one-loop amplitudes in unordered gauge theories in four dimensions. For such theories the organisation of amplitudes in manifestly crossing symmetric expressions poses restrictions on their structure and results in remarkable cancellations. We show that one-loop multi-photon amplitudes in QED with at least eight external photons are given only by scalar box integral functions. This QED ‘no-triangle’ property is true for all helicity configurations and has… CONTINUE READING