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We develop a 5d model for ElectroWeak physics based on a non compact warpedextra dimension of finite length, known as the soft wall scenario, where allthe dynamical degrees of freedom propagate in the 5d bulk. We solve theequations of motion and find the allowed spectra, showing that the mass of thelightest fermionic mode behaves as a power law of the effective 4d Yukawacoupling constant, with the exponent being the corresponding fermionic 5d bulkmass. Precisely this non universal behavior allows us to reproduce thehierarchy between the Standard Model (SM) fermion masses (from neutrinos to thetop quark) with non-hierarchical fermionic bulk masses.

Fermion Mass Hierarchy from the Soft Wall