Light-by-light scattering amplitudes from generalized unitarity in massive QED
Bernicot, Christophe
Original · EN
We calculate all the four-photon helicity amplitudes at the one-loop level in a massive theory using multiple-cut methods. The amplitudes are derived in scalar QED, QED and QED =1 theories. We will see the origin of rational terms. We extend the calculation to the simplest six-photon helicity amplitude where all photons have the same helicity.
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