LEADING TOP MASS CORRECTIONS OF ORDER ${\mathcal O} (\alpha \alpha_s m_t^2 /M_W^2)$ TO THE PARTIAL DECAY RATE $\Gamma (Z\to b\bar b)$

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Abstract
The order corrections to the partial decay rate of are computed using the heavy top mass expansion. They are given by the absorptive part of the corresponding three-loop Z self-energy diagrams. Our method provides an independent way to calculate the QCD corrections to the electroweak one-loop result for and our result represents another confirmation of the one recently published by Fleischer et al.

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