TY - JOUR
T1 - 7 keV sterile neutrino dark matter from split flavor mechanism
AU - Ishida, Hiroyuki
AU - Jeong, Kwang Sik
AU - Takahashi, Fuminobu
N1 - Funding Information:
This work was supported by Scientific Research on Innovative Areas (No. 24111702 [FT], No. 21111006 [FT], and No. 23104008 [FT]), Scientific Research (A) (No. 22244030 and No. 21244033 ) [FT], and JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 ) [FT], and Inoue Foundation for Science [HI and FT]. This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan [FT].
PY - 2014/5/1
Y1 - 2014/5/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2014.03.044
DO - 10.1016/j.physletb.2014.03.044
M3 - Article
AN - SCOPUS:84897567261
SN - 0370-2693
VL - 732
SP - 196
EP - 200
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -