Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
A 6 page version (including summary and contents), PhD Thesis, full postscript file (171 pages in Greek) available at http:/
Scientific paper
The radiative electroweak symmetry breaking, the b-\tau 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 \alpha_s obtained are somewhat larger than the experimental average. The Peccei-Quinn version of the missing-doublet SU(5) model generally predicts smaller values of \alpha_s and b-\tau 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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