Radiative Breaking of Gauge Symmetries in the MSSM and in its Extensions
Abstract
The radiative electroweak symmetry breaking, the b-τ Yukawa and gauge couplings unification in the MSSM and its SU(5) extensions are studied in detail. In the framework of the two-loop renormalization group equations both low- and high-energy threshold effects are included. In the case of the minimal SU(5), the values of αs obtained are somewhat larger than the experimental average. The Peccei-Quinn version of the missing-doublet SU(5) model generally predicts smaller values of αs and b-τ unification, in excellent agreement with all low energy experimental data. We also study the generation of the GUT scale through radiative corrections in the context of an R-symmetric ``flipped" SU(5) x U(1)X model and we find that this is possible in a certain range of values of the parameter space.
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