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In the presence of ${\bf 126 + \bar{126}}$ Higgs multiplets in a SO(10)theory, the fermion masses get contributions from an induced vacuum expectationvalue (VEV) of a $SU(2)_L$ doublet residing in ${\bf 126}$ which differentiatesbetween quarks and leptons by a relative sign leading to a significantcorrection to the prediction of the mass ratio of the bottom quark and the taulepton for ranges of the mass of this extra doublet. We perform a two-looprenormalization group analysis of the minimal version of the one-stepsupersymmetric SO(10) model to display this and re-calculate the corrections tothe top quark mass in the presence of such an induced VEV. We show that theseeffects make the infra-red fixed point scenario consistent with experimentalresults.Comment: revised version with same conclusions. To appear in Phys. Rev.

Effects of a 126-dimensional Higgs scalar on bottom-tau unification and the quasi-infrared fixed point