1998/03/13 by Athanasios Dedes, Dedes, Athanasios
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9803339
A 6 page version (including summary and contents), PhD Thesis, full postscript file (171 pages in Greek) available at http://artemis.sci.uoi.gr/~adedes/phd.ps.gz
arxiv created 1998/03/13 · openalex publication_date 1998/03/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The radiative electroweak symmetry breaking, the b-τYukawa 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-τunification, 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.