Speaker
Description
The associated production of a Higgs boson with a top–antitop quark pair is a crucial process at the LHC since it allows for a direct measurement of the top-quark Yukawa coupling. In this talk we will present the computation of the radiative corrections to this process at the next-to-next-to-leading order (NNLO) in QCD perturbation theory. This represents the very first computation for a 2 → 3 process with massive coloured particles at this perturbative order. In order to overcome the bottleneck of the missing two-loop amplitudes (which are at the frontier of current techniques), we developed a soft Higgs boson approximation, which enabled us to reliably quantify the impact of the yet unknown two-loop contribution. The IR-singularities are treated within the well-established qT-subtraction framework, properly extended to the case of heavy-quark production in association with a colourless system.
