Speaker
Marco Vitti
(Karlsruhe Institute of Technology)
Description
Theoretical calculations for Higgs-related processes at the LHC have reached an impressive level of accuracy. One of the technical challenges that still need to be addressed is the computation of two-loop box diagrams with massive internal lines, e.g. those arising in the NLO QCD corrections for $gg \to ZH$ and $gg \to ZZ$.
In this talk I will present a method for approximating these diagrams analytically, via an expansion in terms of a small transverse momentum. Combining this approximation with a complementary expansion in the high-energy limit, the two-loop amplitude can be efficiently evaluated over the complete phase space.
Primary author
Marco Vitti
(Karlsruhe Institute of Technology)
