Abstract
We embed the minimal left-right model SU(2)L × SU(2)R × U(1)B−L into an SU(4)W gauge group, and break the unified group via five-dimensional S1/(Z2 × Z2) orbifolding. Leptons are fitted into SU(4)W multiplets and located on a symmetry preserving O brane, while quarks are placed onto an O' brane where the symmetry is broken. This approach predicts sin2 θW = 0.25 for the weak mixing angle at tree level and leads to a rather low weakly (strongly) coupled unification scale of order 3 × 102 TeV (several TeV) with supersymmetry, or as low as several TeV in the non-supersymmetric case. Another symmetry breaking chain with the low-energy gauge group SU(2)L × U(1)3R × U(1)B−L can also give rise to a weak mixing angle sin2 θW = 0.25 at tree level after gauge symmetry breaking by orbifolding. Such theories with low-scale unification have interesting phenomenological consequences.
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