Radiative Neutrino Mass Generation and Dark Matter - Institute for ...

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Concrete ModelCoannihilation of DMCoannihilation of DMIf N 2 is degenerated with N 1 (M 1 ≈ M 2 ), they can coannihilate:The effective annihilation cross section σ eff includesN 1 N 2 → l α l β , N 2 N 2 → l α l β .s-wave appears due to the coannihilation processN 1 N 2 → l α l β if the Yukawa h αi are complex.σ eff v = a eff +b eff v 2 , a eff ∝ Im(h ∗ 1h 2 ) ≠ 0.→ It is possible to be consistent with LFV and DM relic abundance.Takashi Toma (IPPP) Internal Seminar 7th June 2013 20 / 34
Concrete ModelAllowed parameter region fromNeutrino mass and mixing Perturbativity |h i | < 1.5LFVDM relic abundance Ωh 2 = 0.12ξ ≡ Im(h ∗ 1 h 2)A: 2.00 < M η /M 1 < 9.80B: 1.20 < M η /M 1 < 2.00C: 1.05 < M η /M 1 < 1.20D: 1.00 < M η /M 1 < 1.051 DM mass 3 TeVTakashi Toma (IPPP) Internal Seminar 7th June 2013 21 / 34
Page 2: OutlineOutline1 Introduction2 Neutr
Page 7: Neutrino Mass GenerationExamples of
Page 10 and 11: Dark MatterNature of DM· stable (o
Page 12 and 13: Dark MatterNon-thermal ProductionNo
Page 14 and 15: Concrete ModelInteractions and Neut
Page 16 and 17: Concrete ModelConstraintsThe parame
Page 18 and 19: Concrete ModelConstraintsConstraint
Page 22 and 23: Concrete ModelDirect Detection of D
Page 28 and 29: Extensions of Radiative Seesaw1. Su
Page 30 and 31: Extensions of Radiative Seesaw2. Fl
Page 32 and 33: SummarySummary1 The SM should be ex
Page 34: Thank you for your attention!Takash

Radiative Neutrino Mass Generation and Dark Matter - Institute for ...

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