Journal
PHYSICS LETTERS B
Volume 734, Issue -, Pages 178-182Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2014.05.035
Keywords
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Funding
- JSPS [21111006, 23104008, 24111702, 21244033, 24740135]
- Inoue Foundation for Science
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- Grants-in-Aid for Scientific Research [24111702, 26800121] Funding Source: KAKEN
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We pursue a possibility that a pseudo-Nambu-Goldstone boson is lurking around or below the intermediate scale. To this end we consider an anomaly-free global flavor symmetry, and construct models where the pseudo-Nambu-Goldstone boson is coupled preferentially to leptons. The experimental and astrophysical bounds derived from couplings to photons and nucleons are significantly relaxed. If sufficiently light, the pseudo-Nambu-Goldstone boson contributes to dark matter, and interestingly, it generally decays into photons through couplings arising from threshold corrections. We show that the recent hint for the X-ray line at about 3.5 keV can be explained by the decay of such pseudo-NambuGoldstone boson of mass about 7 keV with the decay constant of order 1010 GeV, if the electron is charged under the flavor symmetry. (C) 2014 The Authors. Published by Elsevier B.V.
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