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We have recently proposed a setup of the "Domain-Wall Standard Model" in 5Dspacetime, where all the Standard Model (SM) fields are localized in certaindomains of the extra 5th dimension. Utilizing this setup, we attempt to solvethe fermion mass hierarchy problem of the SM. The mass hierarchy can benaturally explained by suitably distributing the fermions in differentpositions along the extra dimension. Due to these different localizationpoints, the effective 4D gauge couplings of Kaluza-Klein (KK) mode gauge bosonsto the SM fermions become non-universal. As a result, our model is severelyconstrained by the Flavor Changing Neutral Current (FCNC) measurements. We findtwo interesting cases in which our model is phenomenologically viable: (1) theKK-mode of the SM gauge bosons are extremely heavy and unlikely to be producedat the Large Hadron Collider (LHC), while future FCNC measurements can revealthe existence of these heavy modes. (2) the width of the localized SM fermionsis very narrow, leading to almost universal 4D KK-mode gauge couplings. In thiscase, the FCNC constraints can be easily avoided even if a KK gauge boson masslies at the TeV scale. Such a light KK gauge boson can be searched at the LHCin the near future.

Fermion Mass Hierarchy and Phenomenology in the 5D Domain Wall Standard Model