Speaker
Description
We consider four and five parton scattering amplitudes in QCD and analyse their high-energy limit and colour structure. On the one hand, our main tools are the Reggeization of $2\rightarrow n$ scattering amplitudes in QCD, known as the effective action that governs their behaviour in the Regge limit or multi-Regge (MR) limit in the case of five or more partons. On the other hand, we use the dipole formula, which governs Infrared factorisation and is a compact ansatz for all-order infrared-singular terms of scattering amplitudes of massless partons. Building upon previous results, we use the compatibility between Regge factorisation and Infrared factorisation to obtain new results like the one-loop central-emission vertex for a gluon with positive helicity.
