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TTP93-15 Mass Effects in Higher Order QCD Corrections to the

TTP93-15 Mass Effects in Higher Order QCD Corrections to the

TTP93-15 Mass Effects in Higher Order QCD Corrections to the

The partial decay rate \mbox{Γ(Zbˉb)} of

the $Z$-boson is significantly affected by 

higher order QCD corrections. Of particular interest is the influence of the non-\ vanishing bottom quark mass. Radiative corrections to the quadratic mass term of the partial Z-width are computed in perturbative QCD.

The calculation of the third order  

O(α3sm2b/M2Z) contribution for the vector induced rate and of the second order O(α2sm2b/M2Z) correction for the axial induced rate is described. The numerical influence of the results and the theoretical uncertainties are discussed.

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