====== TTP07-05 Two-Loop Formfactors in Theories with Mass Gap and Z-Boson Production ======
 
 
   <hidden TTP07-05  Two-Loop Formfactors in Theories with Mass Gap and Z-Boson Production > The non-factorizable two-loop corrections to
 the formfactor both for a $U(1)\times U(1)$
 and a $SU(2)\times U(1)$ gauge theory
 with massive and massless gauge bosons respectively are evaluated at
 arbitrary momentum transfer $q^2$.
 The asymptotic behaviour for  $q^2\to\infty$
 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.
 </hidden>
|**A. Kotikov, J.H. K\"uhn, O. Veretin**  | 
|**  Nucl.Phys.  B788 47-62 2008  **  |
| {{preprints:2007:ttp07-05.pdf|PDF}} {{preprints:2007:ttp07-05.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0703013|arXiv]]   |
| |