Light sterile neutrino in the minimal extended seesaw

Motivated by the recent observations on sterile neutrinos, we present a minimal extension of the canonical type-I seesaw by adding one extra singlet fermion. After the decoupling of right-handed neutrinos, an eV-scale mass eigenstate is obtained without the need of artificially inserting tiny mass s...

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Bibliographic Details
Published in:Physics letters. B 2012-08, Vol.714 (2-5), p.262-266
Main Author: Zhang, He
Format: Article
Language:English
Subjects:
Couplings
Dark matter
Decoupling
Elementary particles
Exact sciences and technology
Fermions
Flavours
Mathematical models
Neutrinos
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary:Motivated by the recent observations on sterile neutrinos, we present a minimal extension of the canonical type-I seesaw by adding one extra singlet fermion. After the decoupling of right-handed neutrinos, an eV-scale mass eigenstate is obtained without the need of artificially inserting tiny mass scales or Yukawa couplings for sterile neutrinos. In particular, the active-sterile mixing is predicted to be of the order of 0.1. Moreover, we show a concrete flavor A4 model, in which the required structures of the minimal extended seesaw are realized. We also comment on the feasibility of accommodating a keV sterile neutrino as an attractive candidate for warm dark matter.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2012.06.074