Small Neutrino Masses From Structural cancellation In Left-Right Symmetric Model

TL;DR

This paper proposes a natural explanation for small neutrino masses via structural cancellation in the left-right symmetric model, allowing right-handed neutrino masses around 10 TeV, and incorporates flavor symmetry for realistic lepton mixing.

Contribution

It introduces a stable structural cancellation mechanism in the LRSM that naturally explains small neutrino masses and embeds A4 flavor symmetry for realistic lepton mixing.

Findings

Structural cancellation leads to small neutrino masses.

Right-handed neutrino masses can be around 10 TeV.

Model achieves realistic lepton mixing with flavor symmetry.

Abstract

The Type I, II and hybrid (I+II) seesaw mechanism, which explain why neutrinos are especially light, are consequences of the left-right symmetric model (LRSM). They can be classified by the ranges of parameters of LRSM. We show that a nearly cancellation in general Type-(I+II) seesaw is more natural than other types of seesaw in the LRSM if we consider their stability against radiative correction. In this scenario the small neutrino masses are due to the structure cancellation, and the masses of the right handed neutrino can be of order of O(10)TeV. The realistic model for non-zero neutrino masses, charged lepton masses and lepton tribimaximal mixing can be implemented by embedding $A_4$ flavor symmetry in the model with perturbations to the textures.