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Journal of High Energy Physics

, 2019:259 | Cite as

Fermion mass hierarchy and phenomenology in the 5D Domain Wall Standard Model

  • Nobuchika Okada
  • Digesh Raut
  • Desmond VillalbaEmail author
Open Access
Regular Article - Theoretical Physics
  • 13 Downloads

Abstract

We have recently proposed a setup of the “Domain-Wall Standard Model” in 5D spacetime, where all the Standard Model (SM) fields are localized in certain domains of the extra 5th dimension. Utilizing this setup, we attempt to solve the fermion mass hierarchy problem of the SM. The mass hierarchy can be naturally explained by suitably distributing the fermions in different positions along the extra dimension. Due to these different localization points, the effective 4D gauge couplings of Kaluza-Klein (KK) mode gauge bosons to the SM fermions become non-universal. As a result, our model is severely constrained by the Flavor Changing Neutral Current (FCNC) measurements. We find two interesting cases in which our model is phenomenologically viable: (1) the KK-mode of the SM gauge bosons are extremely heavy and unlikely to be produced at the Large Hadron Collider (LHC), while future FCNC measurements can reveal the existence of these heavy modes. (2) the width of the localized SM fermions is very narrow, leading to almost universal 4D KK-mode gauge couplings. In this case, the FCNC constraints can be easily avoided even if a KK gauge boson mass lies at the TeV scale. Such a light KK gauge boson can be searched at the LHC in the near future.

Keywords

Phenomenology of Field Theories in Higher Dimensions Phenomenology of Large extra dimensions 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  • Nobuchika Okada
    • 1
  • Digesh Raut
    • 2
  • Desmond Villalba
    • 3
    Email author
  1. 1.Department of Physics and AstronomyThe University of AlabamaTuscaloosaU.S.A.
  2. 2.Department of Physics and AstronomyThe University of DelawareNewarkU.S.A.
  3. 3.Department of Chemistry and PhysicsDrury UniversitySpringfieldU.S.A.

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