Minimal Left-Right Symmetric Model with $A_4$ modular symmetry

TL;DR

This paper develops a minimal left-right symmetric model incorporating $A_4$ modular symmetry, which simplifies the flavor structure without extra flavon particles, and analyzes its implications for neutrino masses and neutrinoless double beta decay.

Contribution

It introduces a novel minimal left-right symmetric model using $A_4$ modular symmetry, avoiding flavons and providing predictions consistent with experimental neutrino data.

Findings

Yukawa couplings are expressed in terms of modular forms and match experimental limits.

Predictions for neutrino masses are within current experimental bounds.

Implications for neutrinoless double beta decay are briefly analyzed.

Abstract

In this paper, we have realized the left-right symmetric model with modular symmetry. We have used $\Gamma$(3) modular group which is isomorphic to non-abelian discrete symmetry group $A_4$. The advantage of using modular symmetry is the non-requirement for the use of extra particles called 'flavons'. In this model, the Yukawa couplings are expressed in terms of modular forms $(Y_1,Y_2,Y_3)$. In this work, we have studied minimal Left-Right Symmetric Model for both type-I and type-II dominances. Here, we have calculated the values for the Yukawa couplings and then plotted it against the sum of the neutrino masses. The results obtained are well within the experimental limits for the desired values of sum of neutrino masses. We have also briefly analyzed the effects of the implications of modular symmetry on neutrinoless double beta decay with the new physics contributions within Left-Right Symmetric Model.