期刊
PHYSICS LETTERS B
卷 743, 期 -, 页码 35-38出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.02.014
关键词
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资金
- Ministry of Education, Culture, Sports, Science, and Technology [24540272]
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [24540272] Funding Source: KAKEN
We suggest a new model of 7 keV right-handed neutrino dark matter inspired by a recent observation of 3.5keVX-ray line signal in the XMM-Newton observatory. It is difficult to derive the tiny masses with a suitable left-right mixing of the neutrino in a framework of ordinary simple type-I seesaw mechanism. We introduce a new Higgs boson, a dark matter-philic Higgs boson, in which the smallness of its vacuum expectation value can be achieved. We investigate suitable parameter regions where the observed dark matter properties are satisfied. We find that the vacuum expectation value of dark matter-philic Higgs boson should be about 0.17GeV. (C) 2015 The Authors. Published by Elsevier B.V.
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