Resonant leptogenesis and TM mixing in minimal type-I seesaw model with S symmetry

Bikash Thapa; Ng. K. Francis

doi:10.1140/epjc/s10052-021-09859-2

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2021) 81: 1061
https://doi.org/10.1140/epjc/s10052-021-09859-2

Regular Article - Theoretical Physics

Resonant leptogenesis and TM $_{1}$ mixing in minimal type-I seesaw model with S $_{4}$ symmetry

Bikash Thapa^a and Ng. K. Francis

Department of Physics, Tezpur University, 784028, Tezpur, India

^a bikash2@tezu.ernet.in

Received: 26 July 2021
Accepted: 21 November 2021
Published online: 2 December 2021

Abstract

We present an S $_{4}$ $$_4$$ flavour symmetric model within a minimal seesaw framework resulting in mass matrices that leads to TM $_{1}$ $$_1$$ mixing. Minimal seesaw is realized by adding two right-handed neutrinos to the Standard Model. The model predicts Normal Hierarchy (NH) for neutrino masses. Using the constrained six-dimensional parameter space of the model, we have evaluated the effective Majorana neutrino mass, which is the parameter of interest in neutrinoless double beta decay experiments. The possibility of explaining baryogenesis via resonant leptogenesis is also examined within the model. A non-zero, resonantly enhanced CP asymmetry generated from the decay of right-handed neutrinos at the TeV scale is studied, considering flavour effects. The evolution of lepton asymmetry is discussed by solving the set of Boltzmann equations numerically and obtain the value of baryon asymmetry to be $| η_{B} | = 6.3 \times 10^{- 10}$ $|\eta _B| = 6.3 \times 10^{-10}$ with the choice of right-handed neutrino mass, $M_{1} = 10$ $$M_1 = 10$$ TeV and mass splitting, $d ≃ 10^{- 8}$ $d \simeq 10^{-8}$ .

© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.