Lepton-pair scattering with an off-shell and an on-shell photon at two loops in massless QED

Simon Badger, Jakub Kryś, Ryan Moodie +1

We compute the two-loop QED helicity amplitudes for the scattering of a lepton pair with an off-shell and an on-shell photon, $0\to \ell \bar{\ell }\gamma {\gamma }^{\ast }$, using the approximation of mas…