Neutrino Democracy And Other Phenomenology From 5D SO(10)

Abstract

We present a five dimensional supersymmetric SO(10) model compactified on an orbifold $S^{(1)}/Z_2\tm Z_2'$. The gauge symmetry $G_{422}\equiv SU(4)_c\tm SU(2)_L\tm SU(2)_R$, realized on one of the fixed points (branes), is spontaneously broken to the MSSM via the higgs mechanism. Employing a flavor $\mathcal{U}(1)$ symmetry and suitably extending the 'matter' sector enables us to understand large mixings in the neutrino sector via a democratic approach, versus the small CKM mixings. A residual $\mathcal{R}$-symmetry on $G_{422}$ brane helps eliminate the troublesome dimension five nucleon decay, while the $\mathcal{U}(1)$ symmetry plays an essential role in suppressing dimension six decay. For rare leptonic decays we expect ${\rm BR}(μ\to e\ga)\sim {\rm BR}(τ\to μ\ga)\sim {\rm BR}(τ\to e\ga)$.

Version to appear in Nucl. Phys. B

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• Gauge-Fermion Unification and Flavour Symmetry
• Fermion masses and proton decay in a minimal five-dimensional SO(10) model
• Suppressed $\te_{13}$ In A Democratic Approach
• Supersymmetric SO(10) And A Prediction For ${\theta }_{13}$
• Theta_{13}, Rare Decays and Leptonic CP Violation
• Proton Stability In Supersymmetric SU(5)