Abstract
We recalculate the complete two-loop correction to the m b/ m τ ratio, allowing the possibility of a large t-quark Yukawa coupling constant, comparable to g QCD. We find that our previous stringent limit on the number of flavours becomes even more stringent; i.e., only six flavours are allowed. As a by-product we find that the mass of the t-quark has to be smaller than 155 GeV.
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