Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-09-25
Nucl.Phys. B551 (1999) 515-548
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages
Scientific paper
10.1016/S0550-3213(99)00249-7
We show how identification of absolutely flat directions allows the construction of a new class of compactified string theories with reduced gauge symmetry that may or may not be continuously connected to the original theory. We use this technique to construct a class of 3 generation models with just the Standard Model gauge group after compactification. We discuss the low-energy symmetries necessary for a phenomenologically viable low-energy model and construct an example in which these symmetries are identified with string symmetries which remain unbroken down to the supersymmetry breaking scale. Remarkably the same symmetry responsible for stabilising the nucleon is also responsible for ensuring one and only one pair of Higgs doublets is kept light. We show how the string symmetries also lead to textures in the quark and lepton mass matrices which can explain the hierarchy of fermion masses and mixing angles.
Pokorski Witold
Ross Graham G.
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