2007/04/25 by C. Munoz, CARLOS MUÑOZ · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum and Classical Electrodynamics #hep-ph
paper · pdf · doi:10.1142/s021773230702347x
published as Mod.Phys.Lett.A22:989-1004,2007 · More references added. Invited review article for Mod. Phys. Lett. A, 15 pages, 4 figures
arxiv created 2007/04/25 · openalex publication_date 2007/05/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E 8 ×E 8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈g GUT × 5.27 × 10 17 GeV ) and the value deduced from LEP experiments (≈2 × 10 16 GeV ), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet–Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable level. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well-controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.