Speaker
Matthias Steinhauser
(KIT)
Description
In this talk three-loop QCD corrections to heavy quark form factors
are presented. They constitute the virtual corrections for various
processes as, e.g., top quark production in $e^+ e^-$ annihilation or
Higgs decay into heavy quarks. A semi-numerical method is discussed,
which is based on expansions around singular and regular kinematical
points. They are matched at intermediate values of the squared
partonic center-of-mass energy $s$ which allows to cover the whole
kinematic range. The method permits a systematic increase of the
precision by varying the expansion depth and the choice of the
intermediate matching points. Results are presented for various
choices of external currents.
Author
Matthias Steinhauser
(KIT)
