期刊
PHYSICS LETTERS B
卷 732, 期 -, 页码 196-200出版社
ELSEVIER
DOI: 10.1016/j.physletb.2014.03.044
关键词
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资金
- JSPS [24740135]
- Inoue Foundation for Science
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- [24111702]
- [21111006]
- [23104008]
- [22244030]
- [21244033]
- Grants-in-Aid for Scientific Research [24111702] Funding Source: KAKEN
The recently discovered X-ray line at about 3.5 keV can be explained by sterile neutrino dark matter with mass, m(s) similar or equal to 7 keV, and the mixing, sin(2) 2 theta similar to 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 7 keV sterile neutrino implies the gravitino mass about 100 TeV. (C) 2014 The Authors. Published by Elsevier B.V.
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