Disentangling the overlapping singularities of NNLO amplitudes
Achilleas Lazopoulos (ETH Zürich)

The ambitious physical programs of modern hadron colliders depend on precise theoretical predictions for various signal and background processes. In some cases, including Higgs production in gluon fusion, Drell-Yan, top pair and dijet production, the necessary precision is only achieved if one calculates the next-to-next-to leading order term in the perturbative expansion of the cross section. The cross section then consists of different pieces, each of which is separately divergent. Moreover, and this is usually the major technical obstacle, the singularities of each piece have an intricate, overlapping structure. I will present in this seminar a new approach to disentangling the overlapping singularities of both the double virtual and the double real part, based on non-linear mappings.