2024/02/26 by Tapender, Surender Verma, Sanjeev Kumar +2
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · pdf · doi:10.48550/arxiv.2402.16491
openalex publication_date 2024/02/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We examine the Scotogenic model employing the TM2 mixing matrix, UTM2, for neutrinos and parameterize the Yukawa coupling matrix y based on the diagonalization condition for the neutrino mass matrix, mν. Our investigation centers on analyzing the relic density of cold dark matter (Ωh2) and possible lepton flavor violation (LFV) in the model. In particular, we study coannihilation dynamics and LFV, in the model, considering various coannihilation scenarios including non-zero mass splitting between lightest sterile neutrinos. While analyzing, we have taken into consideration respective experimental constraints on Ωh2 and LFV alongside neutrino oscillation data. Our study reveals that in both normal and inverted hierarchy of neutrino masses, splitting between masses of N1 and N2 can be up to ≈ 15% for the model to be in consonance with the above constraints. In the second part, we have extended the analysis incorporating extended magic symmetry in mν enabling us to completely determine Yukawa coupling matrix (y). We observe a notable exclusion of the effective Majorana mass |mee| parameter space by cosmological bound on sum of neutrino masses, particularly in the normal hierarchy while inverted hierarchy scenario is excluded due to constraints coming from extended magic symmetry. These findings shed light on the interplay among the Scotogenic model, TM2 mixing, and extended magic symmetry, offering insights into the permitted parameter space and hierarchy exclusion.