Anarchic neutrinos from flavor deconstruction: phenomenology of the lepton sector

TL;DR

This paper explores a flavor deconstruction framework with inverse-seesaw mechanism to explain neutrino mixing and hierarchy, analyzing the phenomenology of heavy neutral leptons and lepton-flavor violation within current and future experimental bounds.

Contribution

It introduces a novel flavor deconstruction approach with inverse-seesaw, linking charged fermion hierarchies to neutrino mixing and analyzing its phenomenological implications.

Findings

Right-handed neutrino scale constrained to a few TeV by current bounds.

Future $$ experiments will probe most of the parameter space below 10 TeV.

Models deconstructing specific gauge groups allow for the lowest deconstruction scales.

Abstract

We investigate the neutrino sector in the framework of flavor deconstruction with an inverse-seesaw realization. This setup naturally links the hierarchical charged-fermion masses to the anarchic pattern of light-neutrino mixing. We determine the viable parameter space consistent with oscillation data and study the phenomenology of heavy neutral leptons (HNL) and lepton-flavor-violating (LFV) processes. Current bounds from direct HNL searches and LFV decays constrain the right-handed neutrino scale to a few TeV, while future $\mu \to e$ experiments will probe most of the region with $\Lambda \lesssim 10~\text{TeV}$. Among possible realizations, models deconstructing $\mathrm{SU}(2)_\mathrm{L} \times \mathrm{U}(1)_\mathrm{B-L}$ or $\mathrm{SU}(2)_\mathrm{L} \times \mathrm{U}(1)_\mathrm{R} \times \mathrm{U}(1)_\mathrm{B-L}$ are those allowing the lowest deconstruction scale.