TTP95-20 Three-loop QCD Corrections to \delta\rho, \DELTA r and \Delta\kappa
TTP95-20 Three-loop QCD Corrections to \delta\rho, \DELTA r and \Delta\kappa
TTP95-20 Three-loop QCD Corrections to \delta\rho, \DELTA r and \Delta\kappa
QCD corrections to electroweak observables are reviewed. Recent results
on contributions from the top-bottom doublet
of ${\cal O}(\as^2)$ to $\drho$, $\Delta r$ and $\Delta\kappa$ are presented.
It is demonstrated that the first three terms
in the expansion in $M_Z^2/M_t^2$ provide an excellent approximation to
the exact result.
Calculational techniques are briefly discussed.
K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser
Proceedings of the Workshop “Perspectives for Electroweak Interactions in e+e- Collisions”, B. A. Kniehl, ed., World Scientific 1995, pp. 97-108 For conference proceedings.