CP violation and FCNC in a warped A4 flavor model

Abstract

We recently proposed a spontaneous A4 flavor symmetry breaking scheme implemented in a warped extra dimensional setup to explain the observed pattern of quark and lepton masses and mixings. The quark mixing is induced by bulk A4 flavons mediating "cross-brane" interactions and a "cross-talk" between the quark and neutrino sectors. In this work we explore the phenomenology of RS-A4 and systematically obtain bounds on the Kaluza-Klein (KK) mass scale implied by flavor changing neutral current (FCNC) processes. In particular, we study the constraints arising from Re(ε'/ε_K), b->sγ, the neutron EDM and Higgs mediated FCNCs, while the tree level contribution to ε_K through a KK gluon exchange vanishes. We find an overall lower bound on the Kaluza-Klein mass scale M_{KK} > 1.3 TeV from FCNCs, induced by b->sγ, differently from flavor anarchic models. This bound is still weaker than the bound M_{KK} > 4.6 TeV induced by Zb_L\bar{b}_L in RS-A4. The little CP problem, related to the largely enhanced new physics contributions to the neutron EDM in flavor anarchic models, is absent. The subtleties of having the Higgs and flavons in the bulk are taken into account and final predictions are derived in the complete three-generation case.

arXiv comment53 pages, 7 figures

References in corpus (30)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• Weak Decays Beyond Leading Logarithms
• Modulus Stabilization with Bulk Fields
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Bulk Fields and Supersymmetry in a Slice of AdS
• Neutrino masses and mixings in non-factorizable geometry
• Underlying A_4 Symmetry for the Neutrino Mass Matrix and the Quark Mixing Matrix
• A custodial symmetry for Zbb
• RS1, Custodial Isospin and Precision Tests
• Model-independent constraints on Delta F=2 operators and the scale of New Physics
• Fermion Masses, Mixings and Proton Decay in a Randall-Sundrum Model
• Tri-bimaximal Neutrino Mixing and Quark Masses from a Discrete Flavour Symmetry
• Delta F=2 Observables and Fine-Tuning in a Warped Extra Dimension with Custodial Protection
• B-factory Signals for a Warped Extra Dimension
• A Model of Lepton Masses from a Warped Extra Dimension
• Simple Non-Abelian Finite Flavor Groups and Fermion Masses
• Implications of the measurement of the B^0_s-\bar B^0_s mass difference
• Natural Neutrino Masses and Mixings from Warped Geometry
• A GIM Mechanism from Extra Dimensions
• Combining Direct & Indirect Kaon CP Violation to Constrain the Warped KK Scale
• The Custodial Randall-Sundrum Model: From Precision Tests to Higgs Physics
• The Gaugephobic Higgs
• Neutrino oscillations and rare processes in models with a small extra dimension
• An A4 flavor model for quarks and leptons in warped geometry
• U(2) Flavor Physics without U(2) Symmetry
• Minimal Flavor Violation in the Lepton Sector of the Randall-Sundrum Model
• The Impact of Kaluza-Klein Fermions on Standard Model Fermion Couplings in a RS Model with Custodial Protection
• What is the (epsilon'/epsilon)_exp Telling Us ?
• A Viable Flavor Model for Quarks and Leptons in RS with T' Family Symmetry

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• The Higgs: so simple yet so unnatural
• A Model for Tri-bimaximal Mixing from a Completely Broken $A_4$
• The symmetry approach to quark and lepton masses and mixing
• Predictions from warped flavordynamics based on the $T^{\prime }$ family group
• Theta(13) and charged Lepton Flavor Violation in "warped" A(4) models
• A novel Randall-Sundrum model with $S_3$ flavor symmetry