$Ø(\GF^2\Mt^4)$ Electroweak Radiative Corrections to the $\PZ\Pb\Pbbar$ Vertex
arXiv:hep-ph/9305273 · doi:10.1007/BF01650447
Abstract
The leading heavy-top two-loop corrections to the \Zbb~vertex are determined from a direct evaluation of the corresponding Feynman diagrams in the large \Mt~limit. %The calculation is done in the naive %dimensional regularization scheme with anticommuting $\ga_5$. The leading one-loop top-mass effect is enhanced by $[1+\GF\Mt^2(9-π^2/3)/(8π^2\sqrt{2})]$. Our calculation confirms a recent result of Barbieri et al.
12 pages, 3 figures (postscript files attached), Latex, CERN-TH.6874/93