Peccei-Quinn symmetry as the origin of Dirac Neutrino Masses

TL;DR

This paper introduces a model linking Dirac neutrino masses to Peccei-Quinn symmetry breaking, connecting neutrino physics with QCD scale and axion dark matter, and explores phenomenological implications including collider signals.

Contribution

It presents a novel one-loop Dirac neutrino mass model derived from Peccei-Quinn symmetry breaking, integrating neutrino mass generation with QCD and axion dark matter.

Findings

Neutrino masses are generated at one-loop level from PQ symmetry breaking.

The model's parameter space aligns with neutrino oscillation data and leptonic decay constraints.

Distinct collider signatures from singly charged scalars are identified.

Abstract

We propose a model of Dirac neutrino masses generated at one-loop level. The origin of this mass is induced from Peccei-Quinn symmetry breaking which was proposed to solve the so-called strong CP problem in QCD, therefore, the neutrino mass is connected with the QCD scale, $\Lambda_{\rm QCD}$. We also study the parameter space of this model confronting with neutrino oscillation data and leptonic rare decays. The phenomenological implications to leptonic flavor physics such as the electromagnetic moment of charged leptons and neutrinos are studied. Axion as the dark matter candidate is one of the byproduct in our scenario. Di-photon and Z-photon decay channels in the LHC Higgs search are investigated, we show that the effects of singly charged singlet scalar can be distinguished from the general two Higgs doublet model.