Spontaneous CP violation in E6 SUSY GUT with SU(2) flavor and anomalous U(1) symmetries

Abstract

We construct a model of spontaneous CP violation in E6 supersymmetric grand unified theory. In the model, we employ an SU(2)F flavor symmetry and an anomalous U(1)A symmetry. The SU(2)F flavor symmetry is introduced to provide the origin of hierarchical structures of Yukawa coupling and to ensure the universality of sfermion soft masses. The anomalous U(1)A symmetry is introduced to realize the doublet-triplet mass splitting, to provide the origin of hierarchical structures of Yukawa couplings, and to solve the mu problem. In the model, CP is spontaneously broken by the SU(2)F breaking in order to provide a Kobayashi-Maskawa phase and to evade the supersymmetric CP problem. However, a naive construction of the model generally leads to unwanted outcome, Arg[mu b*]=O(1), when CP violating effects in the flavor sector are taken into account. We cure this difficulty by imposing a discrete symmetry and find that this prescription can play additional roles. It ensures that realistic up-quark mass and Cabibbo angle are simultaneously realized without cancellation between O(1) coefficients. Also, severe constraints from the chromo-electric dipole moment of the quark can be satisfied without destabilizing the weak scale. The discrete symmetry reduces the number of free parameters, but the model is capable of reproducing quark and lepton mass spectra, mixing angles, and a Jarlskog invariant. We obtain characteristic predictions Vub sim O(lambda^4) (lambda=0.22) and |Vcb Yb| = |Yc| at the grand unified theory scale.

20 pages, 1 figure, Eq(6.1) corrected

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Cited by in corpus (9)

• Prospects for New Physics from gauge Left-Right-Colour-Family Grand Unification hypothesis
• E6 grand unified theory with three generations from heterotic string
• Leptogenesis in $E_6\times U(1{)}_A$ SUSY GUT model
• Neutrino properties in E6 x SU(2)F SUSY GUT with spontaneous CP violation
• Nucleon decay via dimension-6 operators in $E_6\times SU(2{)}_F\times U(1{)}_A$ SUSY GUT model
• Constraints of chromoelectric dipole moments to natural SUSY type sfermion spectrum
• Spontaneous SUSY breaking in natural SO(10) grand unified theory
• Sizable D-term contribution as a signature of $E_6\times SU(2{)}_F\times U(1{)}_A$ SUSY GUT model
• Heavy gravitino, naturalness, and sizable anomaly mediation