Neutrino Masses with Enhanced $B-L$ Symmetry

TL;DR

This paper explores a novel 'enhanced $B-L$ symmetry' framework where certain right-handed neutrinos have arbitrarily large charges, affecting neutrino masses, decay channels, and potential observable signatures in neutrino and dark matter experiments.

Contribution

It introduces the concept of anomaly-free, enhanced $B-L$ symmetry with large charge factors for right-handed neutrinos, linking it to neutrino mass generation and experimental signatures.

Findings

Enhanced $B-L$ charges can be arbitrarily large for two right-handed neutrinos.

Neutrino masses are generated via gravity-induced condensates at sub-eV scales.

Light $A'$ gauge boson mediates neutrino interactions, constrained by decay and scattering experiments.

Abstract

Assuming all three known neutrinos are Dirac fermions, $U(1)_{B-L}$ can be an exact symmetry. We show that, if the condition of charge quantization is relaxed, the anomaly-free $B-L$ charges of two out of three right-handed neutrinos can be enhanced by arbitrarily large factors, while all other fermions retain their canonical charges. We call this setup as `enhanced $B-L$ symmetry' and promote it to be local. As long as this enhanced $B-L$ gauge symmetry remains unbroken, neutrinos stay chiral and massless at low energies. Nonzero neutrino masses then require sub-eV-scale symmetry breaking order parameters, which we associate with gravity-induced neutrino condensate. If the enhancement is large and the $B-L$ gauge boson $A'$ is lighter than the heaviest neutrino, then the neutrino decay into $A'$ directly constrains the gauge coupling, which can be significantly stronger than the baryon-based fifth-force tests. Through kinetic mixing with the photon, $A'$ can also mediate neutrino-electron and coherent neutrino-nucleus scatterings, leading to possible signatures in neutrino observatories and dark matter detectors.