2025/05/15 by Sudhakantha Girmohanta, Girmohanta, Sudhakantha, Yu-Cheng Qiu +1 · 1 citation
Physics and Astronomy · #Particle physics theoretical and experimental studies #Black Holes and Theoretical Physics #Neutrino Physics Research
paper · pdf · doi:10.48550/arxiv.2505.10233
The Randall-Sundrum model with the Higgs localized on the IR brane solves the gauge hierarchy problem. However, the associated low cutoff (Λ∼ 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 wave function overlap. We employ this to reproduce the current Cabibbo-Kobayashi-Maskawa and Pontecorvo-Maki-Nakagawa-Sakata structures. Assuming universal five-dimensional Yukawa couplings, generation-blind profile for right-handed neutrinos and flat profile for the third generation SM doublets, it predicts Dirac neutrinos with a total mass ∼ 66 meV. Since the ZN charges must be generation blind, flavor observables serve as key probes.