期刊
PHYSICS LETTERS B
卷 751, 期 -, 页码 81-88出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2015.10.021
关键词
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资金
- National Research Foundation of Korea (NRF) Research Grant [NRF-2015R1A2A1A05001869]
- NRF - Korea government (MSIP) through Korea Neutrino Research Center at Seoul National University [2009-0083526]
- National Science Foundation [PHYS-1066293]
- National Research Foundation of Korea [2009-0083526, PG021403] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The recently observed IceCube PeV events could be due to heavy dark matter (DM) decay. In this paper, we propose a simple DM model with extra U(1)(X) gauge symmetry and bridge it with standard model particles through heavy right-handed neutrino. The Dirac fermion DM chi with mass similar to 5PeV can dominantly decay into a dark Higgs (phi), the SM Higgs (h) and a neutrino (nu). If the lifetime of chi is similar to O(10(28)) s, the resulting neutrino flux can fit data consistently. The neutrino flux from chi ->phi h nu in our model is softer than the one predicted from chi ->nu h, for example. We also discuss a possible mechanism to produce DM with the right relic abundance. (C) 2015 The Authors. Published by Elsevier B.V.
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