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Inspired by the decaying dark matter (DM) which can explain cosmic rayanomalies naturally, we consider the supersymmetric Standard Model with threeright-handed neutrinos (RHNs) and R-parity, and introduce a TeV-scale DM sectorwith two fields \phi_{1,2} and a $Z_3$ discrete symmetry. The DM sector onlyinteracts with the RHNs via a very heavy field exchange and then we can explainthe cosmic ray anomalies. With the second right-handed neutrino N_2 dominantseesaw mechanism at the low scale around 10^4 GeV, we show that \phi_{1,2} canobtain the vacuum expectation values around the TeV scale, and then thelightest state from \phi_{1,2} is the decay DM with lifetime around \sim10^{26}s. In particular, the DM very long lifetime is related to the tinyneutrino masses, and the dominant DM decay channels to \mu and \tau are relatedto the approximate \mu-\tau symmetry. Furthermore, the correct DM relic densitycan be obtained via the freeze-in mechanism, the small-scale problem for powerspectrum can be solved due to the decays of the R-parity odd meta-stable statesin the DM sector, and the baryon asymmetry can be generated via the softleptogensis.

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