Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-02
Phys.Rev.D79:093004,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 2 figures, accepted version for publication,
Scientific paper
10.1103/PhysRevD.79.093004
We reexamine relic abundance of a singlet fermion as a CDM candidate, which contributes to the neutrino mass generation through radiative seesaw mechanism. We search solutions for Yukawa couplings and the mass spectrum of relevant fields to explain neutrino oscillation data. For such solutions, we show that an abundance of a lightest singlet fermion can be consistent with WMAP data without conflicting with both bounds of $\mu\to e\gamma$ and $\tau\to \mu\gamma$. This reconciliation does not need any modification of the original radiative seesaw model other than by specifying flavor structure of Yukawa couplings and taking account of coannihilation effects.
Suematsu Daijiro
Toma Takashi
Yoshida Tetsuro
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