Speaker
Julia Karlen
(ETH Zurich)
Description
In this talk I will describe the construction of local infrared counterterms to remove all infrared singularities in two-loop amplitudes for gluon-fusion processes to colourless final states. The counterterms are given as form-factor integrands whose integrals are known and the number of such counterterms are very small compared to the number of diagrams involved. This procedure is based on the universality of infrared singularities. Removing ultraviolet counterterms results in a locally finite amplitude, which admits numerical integration in momentum space.
