Analytic two-loop amplitudes for $q\bar{q}\to \gamma \gamma$ and $gg\to \gamma \gamma$ mediated by a heavy-quark loop

Matteo Becchetti, Federico Coro, Christoph Nega +2

We address the analytic computation of the two-loop scattering amplitudes for the production of two photons in parton-parton scattering, mediated by loops of heavy quarks. Due to t…