Light Dirac Neutrinos In An $SU(2)_L\times U(1)_Y$ Model

TL;DR

This paper proposes an $SU(2)_L\times U(1)_Y$ model with an extended Higgs sector and right-handed neutrinos to generate light Dirac neutrino masses, incorporating loop corrections and bi-maximal mixing to align with experimental data.

Contribution

It introduces a novel $SU(2)_L\times U(1)_Y$ model that naturally produces light Dirac neutrinos with realistic mixing, including loop corrections for mass splitting.

Findings

Successfully generates eV-scale Dirac neutrino masses.

Achieves bi-maximal mixing compatible with solar and atmospheric neutrino data.

Incorporates loop corrections to lift degeneracy in neutrino masses.

Abstract

Light Dirac neutrino of mass of mass of the order of few eV is obtained in an $SU(2)_L\times U(1)_Y$ model with an extended Higgs sector and right-handed neutrinos. Small neutrino mass is generated at the tree level through small effective coupling of the Dirac neutrino mass term due to soft discrete symmetry breaking. In order to remove the exact degeneracy in mass between the second and the third generation of neutrinos, one loop corrected mass terms are incorporated. The model can accommodate bi-maximal mixing scenario of neutrino which has been favoured by recent Solar and atmospheric neutrino experiments.