The Randall-Sundrum model with the Higgs localized on the IR brane solves the gauge hierarchy problem. However, the associated low cutoff (10 TeV) generically leads to unacceptably rapid nucleon decay and excessively large Majorana neutrino masses. Achieving consistency while simultaneously explaining the Yukawa hierarchy requires either a horizontal symmetry or a discrete gauged symmetry. We demonstrate that eliminating all dangerous operators within a horizontal symmetry framework must come with large and unattractive charge assignments, if possible at all. Hence, we consider an exact discrete gauged ZN symmetry, with fermion mass hierarchies generated via wavefunction overlap. We employ this to reproduce the current CKM and PMNS structures. Under minimal assumptions, it predicts Dirac neutrinos with a total mass 66 meV. Since the ZN charges must be generation-blind, flavor observables serve as key probes.
Girmohanta et al. (Thu,) studied this question.