Light Sterile Neutrino in the Minimal Extended Seesaw

Details Light Sterile Neutrino in the Minimal Extended Seesaw Light Sterile Neutrino in the Minimal Extended Seesaw

2011-10-31

arxiv.org/abs/1110.6838v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages

Scientific paper

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 A_4 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.

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