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Light neutrinos, Dark matter and leptogenesis near electroweak scale and $Z_4$ symmetry

Kunal Pandey, Rathin Adhikari

Abstract

Considering $Z_4$ symmetry in Type I seesaw scenario, one could obtain mass-squared differences of light neutrinos, mixings and $CP$ violating phase within $3 σ$ confidence level based on neutrino oscillation data. This is possible with only three independent complex parameters for allowed Yukawa couplings and one real mass parameter for heavy right handed neutrino fields around electroweak scale. After considering only three more real parameters as coming from small soft-symmetry breaking terms, the lightest right handed neutrino could be considered as dark matter candidate via freeze-in mechanism and the other two heavier right handed neutrinos through their decays, could generate the baryonic asymmetry of the universe naturally via resonant leptogenesis.

Light neutrinos, Dark matter and leptogenesis near electroweak scale and $Z_4$ symmetry

Abstract

Considering symmetry in Type I seesaw scenario, one could obtain mass-squared differences of light neutrinos, mixings and violating phase within confidence level based on neutrino oscillation data. This is possible with only three independent complex parameters for allowed Yukawa couplings and one real mass parameter for heavy right handed neutrino fields around electroweak scale. After considering only three more real parameters as coming from small soft-symmetry breaking terms, the lightest right handed neutrino could be considered as dark matter candidate via freeze-in mechanism and the other two heavier right handed neutrinos through their decays, could generate the baryonic asymmetry of the universe naturally via resonant leptogenesis.

Paper Structure

This paper contains 11 sections, 88 equations, 4 figures, 3 tables.

Table of Contents

  1. Introduction
  2. Massless Texture of Seesaw Mass Matrix At Tree Level :
  3. Case-I
  4. Case-II
  5. One-Loop Corrections and Light Neutrino Mass Matrix:
  6. Light Neutrino masses and mixing and $CP$ violating phase
  7. Dark Matter Candidate
  8. Leptogenesis
  9. Searches for right handed neutrinos of masses around 152 GeV
  10. Conclusion
  11. Expressions for the various one-loop corrections:

Figures (4)

  • Figure 1: Various loop corrections involving gauge and Higgs bosons.
  • Figure 2: One-loop corrections to the $M_L$
  • Figure 3: Variation of $\widetilde{M_{1}}$ versus $\widetilde{Y}_{Dark}$ that reproduces the observed relic density.
  • Figure 4: Variation of $-Y_{\Delta L }$ versus $z$ due to $\widetilde{N_i}$ decays to different flavors of light neutrinos.