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arXiv · 1008.1621

Decaying Dark Matter in the Supersymmetric Standard Model with Freeze-in and Seesaw mechanims

Zhaofeng Kang·Tianjun Li
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Abstract

Inspired by the decaying dark matter (DM) which can explain cosmic ray anomalies naturally, we consider the supersymmetric Standard Model with three right-handed neutrinos (RHNs) and R-parity, and introduce a TeV-scale DM sector with two fields ϕ_{1,2} and a $Z_3$ discrete symmetry. The DM sector only interacts with the RHNs via a very heavy field exchange and then we can explain the cosmic ray anomalies. With the second right-handed neutrino N_2 dominant seesaw mechanism at the low scale around 10^4 GeV, we show that ϕ_{1,2} can obtain the vacuum expectation values around the TeV scale, and then the lightest state from ϕ_{1,2} is the decay DM with lifetime around \sim 10^{26}s. In particular, the DM very long lifetime is related to the tiny neutrino masses, and the dominant DM decay channels to μand τare related to the approximate μ-τsymmetry. Furthermore, the correct DM relic density can be obtained via the freeze-in mechanism, the small-scale problem for power spectrum can be solved due to the decays of the R-parity odd meta-stable states in the DM sector, and the baryon asymmetry can be generated via the soft leptogensis.

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Zhaofeng Kang, Tianjun Li. 2010-08-10. Decaying Dark Matter in the Supersymmetric Standard Model with Freeze-in and Seesaw mechanims. https://doi.org/10.1007/jhep02(2011)035

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