Two-loop formfactors in theories with mass gap and Z-boson production Original Research Article

The non-factorizable two-loop corrections to the formfactor both for a image and a image gauge theory with massive and massless gauge bosons respectively are evaluated at arbitrary momentum transfer image. The asymptotic behaviour for image is compared to a recent calculation of Sudakov logarithms. The result is an important ingredient for the calculation of radiative corrections to Z-boson production at hadron and lepton colliders.