Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-11-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
A 6 page version (conclusion chapter). uuencoded postcript. The full postscript file (158 pages) is available via anonymous ft
Scientific paper
The status of coupling constant unification -- assuming the validity of the standard model or of its minimal supersymmetric extension at high energies -- and of relations between various Yukawa couplings (assuming the supersymmetri extension) which are implied in certain grand-unified theories, are studied in detail. Theoretical uncertainties in the calculations are emphasized, and low-energy constraints and predictions are derived. In particular, we find that bottom-tau unification favors a Higgs boson lighter than 110 GeV. The structure of the vacuum in the model studied is also discussed. Implications of embedding supersymmetric models in grand-unified theories are further explored and are shown to affect the soft supersymmetry breaking mass parameters of the models, and thus the spectrum at low-energy.
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