期刊
EUROPEAN PHYSICAL JOURNAL C
卷 75, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-014-3252-1
关键词
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资金
- FP7 European ITN project Invisibles [PITN- GA-2011-289442-INVISIBLES]
- OCEVU Labex by Investissements d'Avenir French government program [ANR-11-LABX-0060]
- Helmholtz Alliance for Astroparticle Physics HAP - Initiative and Networking Fund of the Helmholtz Association
We show that novel paths to dark matter generation and baryogenesis are open when the standard model is extended with three sterile neutrinos Ni and a charged scalar delta(+). Specifically, we propose a new production mechanism for the dark matter particle-a multi-keV sterile neutrino, N-1 - that does not depend on the active-sterile mixing angle and does not rely on a large primordial lepton asymmetry. Instead, N-1 is produced, via freeze-in, by the decays of delta(+) while it is in equilibrium in the early Universe. In addition, we demonstrate that, thanks to the couplings between the heavier sterile neutrinos N-2,N-3 and delta(+), baryogenesis via leptogenesis can be realized close to the electroweak scale. The lepton asymmetry is generated either by N-2,N-3-decays for masses M-2,M-3 greater than or similar to TeV, or by N-2,N-3-oscillations for M-2,M-3 similar to GeV. Experimental signatures of this scenario include an X-ray line from dark matter decays, and the direct production of delta(+) at the LHC. This model thus describes a minimal, testable scenario for neutrino masses, the baryon asymmetry, and dark matter.
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