Speaker
Federico Coro
Description
We consider the two-loop helicity amplitudes for photon pair
production in gluon fusion with a loop of heavy quark. We adopt a
procedure to obtain an $\epsilon$-factorised form for the full system of
MIs, also for those whose analytic structure involves elliptic functions. We discuss the
simplifications at amplitude and integrand level that can be achieved
by expressing the amplitude in terms of iterated integrals.
