Flavor Constraints on Split Fermion Models

Abstract

We examine the contributions to rare processes that arise in models where the Standard Model fermions are localized at distinct points in compact extra dimensions. Tree-level flavor changing neutral current interactions for the Kaluza-Klein (KK) gauge field excitations are induced in such models, and hence strong constraints are thought to exist on the size of the additional dimensions. We find a general parameterization of the model which does not depend on any specific fermion geography and show that typical values of the parameters can reproduce the fermion hierarchy pattern. Using this parameterization, we reexamine the contributions to neutral meson mixing, rare meson decays, and single top-quark production in $e^{+}{e}^{-}$ collisions. We find that is it possible to evade the stringent bounds for natural regions of the parameters, while retaining finite separations between the fermion fields and without introducing a new hierarchy. The resulting limits on the size of the compact dimension can be as low as TeV${}^{-1}$.

29 pages, 8 figures, uses bibtex, expanded discussion on rare B decays, references added

References in corpus (7)

• The Impact of Universal Extra Dimensions on the Unitarity Triangle and Rare K and B Decays
• Bulk fields with general brane kinetic terms
• Search for Single Top Production at LEP
• Effects of Universal Extra Dimensions on $B^0-{\bar{B}}^0$ Mixing
• Realistic construction of split fermion models
• Flavour Changing Neutral Currents in Intersecting Brane Models
• CP violation in 5D Split Fermions Scenario

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• Yukawa Hierarchies From Extra Dimensions With Small FCNC
• Split Fermions Baryogenesis from the Kobayashi-Maskawa Phase
• Neutrino Masses and Mixing in Models with Large Extra Dimensions and Localized Fermions
• Pedagogical Introduction to Extra Dimensions
• An Extra-Dimensional Model of Dark Matter
• A Hybrid Model of Neutrino Masses and Oscillations: Bulk Neutrinos in the Split-Fermion Scenario
• Contact interactions in low scale string models with intersecting $D6$-branes
• Lepton flavor violating Z->l_1^+ l_2^- decay in the split fermion scenario in the two Higgs Doublet model
• Neutrino Masses via the Zee Mechanism in 5D split fermions model
• Fermion Mass Hierarchy and Phenomenology in the 5D Domain Wall Standard Model
• The effect of the location of the new Higgs doublet on the radiative lepton flavor violating decays in the split fermion scenario
• Charged lepton electric dipole moments with the localized leptons and the new Higgs doublet in the two Higgs doublet model
• Fermion Masses and Mixing in Four and More Dimensions
• Charged Lepton Flavor Physics and Extra Dimensions
• The effect of the Gaussian profile of the new Higgs doublet on the radiative lepton flavor violating decay
• Generating the Baryon Asymmetry of the Universe in Split Fermion Models