7 keV sterile neutrino dark matter from split flavor mechanism

Hiroyuki Ishida, Kwang Sik Jeong, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


The recently discovered X-ray line at about 3.5keV can be explained by sterile neutrino dark matter with mass, m s ≃ 7keV, and the mixing, sin22θ ~ 10 -10. Such sterile neutrino is more long-lived than estimated based on the seesaw formula, which strongly suggests an extra flavor structure in the seesaw sector. We show that one can explain both the small mass and the longevity based on the split flavor mechanism where the breaking of flavor symmetry is tied to the breaking of the B - L symmetry. In a supersymmetric case we find that the 7keV sterile neutrino implies the gravitino mass about 100TeV.

Original languageEnglish
Pages (from-to)196-200
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2014 May 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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