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We point out that, contrary to some recent claims, there is no intrinsiclong-distance uncertainty in perturbative calculation of the QCD effects in the$t \tb$ and $t \bb$ loops giving the electroweak corrections proportional to$m_t^2$. If these corrections are expressed in terms of the ``on-shell" mass$m_t$, the only ambiguity arising is that associated with the definition of the``on-shell" mass of a quark. The latter is entirely eliminated if the result isexpressed in terms of $m_t$ defined at short distances. Applying theBrodsky-Lepage-Mackenzie criterion for determining the natural scale fornormalization of $\as$, we find that using the ``on-shell" mass makes thisscale numerically small in units of $m_t$. Specifically, we find that by thiscriterion the first QCD correction to the $O(m_t^2)$ terms is determined by$\as^\msb(0.15 m_t)$. Naturally, a full calculation of three-loop graphs isneeded to completely quantify the scale.Comment: LaTeX, 10 pages + 1 figure (appended as a PostScript file

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Normalization of QCD effects on<i>O</i>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="italic">m</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">t</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math>) electroweak corrections

Normalization of QCD effects onO(mt2) electroweak corrections