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

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

2010-08-10

arxiv.org/abs/1008.1621v1

JHEP 1102:035,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages,3 figures

Scientific paper

10.1007/JHEP02(2011)035

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 \phi_{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 \phi_{1,2} can obtain the vacuum expectation values around the TeV scale, and then the lightest state from \phi_{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 \mu and \tau are related to the approximate \mu-\tau symmetry. 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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