Corrections of order O(GF Mt2 2) to the ρ parameter
K. G. Chetyrkin, J. H. Kuehn, M. Steinhauser
Abstract
The three-loop QCD corrections to the ρ parameter from top and bottom quark loops are calculated. The result differs from the one recently calculated by Avdeev et al. As function of the pole mass the numerical value is given by =3GF Mt282π2(1- 2.8599 - 14.594 ()2 ).
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