2023/02/20 by Mayengbam Kishan Singh, Singh, Mayengbam Kishan, S. Robertson Singh +3
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2302.09840
openalex publication_date 2023/02/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We develop an A4 × Z4 × Z2 symmetry extension of Standard Model under the minimal extended seesaw (MES) mechanism which successfully predicts neutrino masses and mixings patterns. This model breaks μ-τ symmetry of neutrino mass matrix and explains leptonic mixing with non-zero θ13. 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 δCP and two Majorana phases α and β are also calculated from the leptonic mixing matrix. Best-fit values of the model parameters and neutrino observables are calculated from χ2 analysis. The model predicts best-fit values of neutrino mixing angles to be sin2θ23=0.555, sin2θ12=0.301 and sin2θ13=0.022 for normal hierarchy. Significant results consistent with experimental data are also observed for effective neutrino mass mββ ∼ (0.97 - 5.02) meV, effective electron mass mβ ∼ (0.084-0.41)eV and sum of active neutrino masses ∑ mi < 0.12 eV. The model does not favour Inverted hierarchy at the 3σ level with the given parameter space.