Speaker
Description
In this talk I will review recent progress in our understanding of infrared (IR) factorisation of scattering amplitude integrands. I will discuss how a detailed picture of the IR properties of gauge-theory scattering amplitudes can be exploited to derive finite-remainder integrands which are amenable to direct numerical integration, bypassing the complexity encountered in standard analytic calculations. As a proof of concept, I will use two-loop amplitudes in massless QED, where integrand-level finite remainders are known for generic processes. Finally, I will discuss generalisations to QCD, in particular the first steps towards a systematic understanding of the non-trivial interplay of colour flow, loop-momentum bases and the factorisation of collinear divergences.