| Title: |
KeV dark matter in minimal extended seesaw model and its predictions in neutrinoless double beta decay and baryogenesis |
| Authors: |
Singh, Mayengbam Kishan, Singh, S. Robertson, Singh, N. Nimai |
| Publication Year: |
2023 |
| Collection: |
High Energy Physics - Phenomenology |
| Subject Terms: |
High Energy Physics - Phenomenology |
| More Details: |
We develop an $A_4 \times Z_4 \times Z_2$ symmetry extension of Standard Model under the minimal extended seesaw (MES) mechanism which successfully predicts neutrino masses and mixings patterns. This model breaks $\mu-\tau$ symmetry of neutrino mass matrix and explains leptonic mixing with non-zero $\theta_{13}$. We study the phenomenological results of the keV-scale sterile neutrino as a dark matter candidate along with other phenomenologies such as neutrino oscillation observables, neutrinoless double beta decay, baryogenesis via leptogenesis, etc. Dirac CP-violating phase $\delta_{CP}$ and two Majorana phases $\alpha$ and $\beta$ are also calculated from the leptonic mixing matrix. Best-fit values of the model parameters and neutrino observables are calculated from $\chi^2$ analysis. The model predicts best-fit values of neutrino mixing angles to be $\sin^2\theta_{23}=0.555,\ \sin^2\theta_{12}=0.301$ and $\sin^2\theta_{13}=0.022$ for normal hierarchy. Significant results consistent with experimental data are also observed for effective neutrino mass $m_{\beta\beta} \sim (0.97 - 5.02)$ meV, effective electron mass $m_{\beta} \sim (0.084-0.41)$eV and sum of active neutrino masses $\sum m_{i} < 0.12$ eV. The model does not favour Inverted hierarchy at the 3$\sigma$ level with the given parameter space.
Comment: 27 pages, 10 Figures |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2302.09840 |
| Accession Number: |
edsarx.2302.09840 |
| Database: |
arXiv |
