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

Concrete ModelConstraintsConstraints from LFVBr(l α → l β γ) = 3α em64πG 2 F M4 η3∑∣i=1The experimental boundsBr(µ → eγ) < 2.4×10 −12Br(τ → µγ) < 4.4×10 −8Br(τ → eγ) < 3.3×10 −8( Mhαi ∗ 2) ∣ 2h i ∣∣∣βiF 2Mη2 Br(l α → l β ν α ν β )where Br(µ → eν µ ν e ) ≃ 1, Br(τ → µν τ ν µ ) ≃ 0.174,Br(τ → eν τ ν e ) ≃ 0.178.→ Yukawa couplings h αi should be small.orSpecial structure of Yukawa matrix.Takashi Toma (IPPP) Internal Seminar 7th June 2013 18 / 34