Towards a Theory of Flavor from Orbifold GUTs

Abstract

We show that the recently constructed 5-dimensional supersymmetric $S^1/(Z_2\times Z_2^{\prime })$ orbifold GUT models allow an appealing explanation of the observed hierarchical structure of the quark and lepton masses and mixing angles. Flavor hierarchies arise from the geometrical suppression of some couplings when fields propagate in different numbers of dimensions, or on different fixed branes. Restrictions arising from locality in the extra dimension allow interesting texture zeroes to be easily generated. In addition the detailed nature of the SU(5)-breaking orbifold projections lead to simple theories where $b-\tau$ unification is maintained but similar disfavored SU(5) relations for the lighter generations are naturally avoided. We find that simple 5d models based on $S^1/(Z_2\times Z_2^{\prime })$ are strikingly successful in explaining many features of the masses and mixing angles of the 2nd and 3rd generation. Successful three generation models of flavor including neutrinos are constructed by generalizing the $S^1/(Z_2\times Z_2^{\prime })$ model to six dimensions. Large angle neutrino mixing is elegantly accommodated. Novel features of these models include a simple $m_u=0$ configuration leading to a solution of the strong CP problem.

18 pages, 6 figures

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Cited by in corpus (19)

• $SU(5)$ Grand Unified Theory with $A_4$ Modular Symmetry
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• Renormalizable extra-dimensional models
• E6 inspired SUSY models with exact custodial symmetry
• Flavor Symmetry Breaking and Vacuum Alignment on Orbifolds
• Holographic Grand Unification
• A comparison of ultraviolet sensitivities in universal, nonuniversal, and split extra dimensional models
• A Domino Theory of Flavor
• E6 inspired composite Higgs model
• Natural Scherk-Schwarz Theories of the Weak Scale
• Fermion masses and proton decay in a minimal five-dimensional SO(10) model
• Retrofitted Natural Supersymmetry from a U(1)
• CP Violation and Flavour Mixings in Orbifold GUTs
• Consequences of a unified, anarchical model of fermion masses and mixings
• Radiative stabilization of warped space
• Hadronic EDM Constraints on Orbifold GUTs
• Orbifold Modular GUT of Flavour
• Remarks on flavour mixings from orbifold compactification