Interpretation of the DAMPE 1.4 TeV peak according to the decaying dark matter model

Abstract

Highly accurate measurements of cosmic ray electron flux by the dark matter particle explorer (DAMPE) ranging between 25 GeV and 4.6 TeV have recently been published. A sharp peak structure was found at $\rm~\sim~1.4~~TeV$. This unexpected peak structure can be reproduced by the annihilation/decay of a nearby dark matter (DM) halo. In this study, we adopt the decaying-DM model to interpret the $\rm~\sim~1.4~~TeV$ peak. We found that the decay products of the local DM subhalo could contribute to the DMAPE peak with $m_{\rm~DM}=~{\rm~3~}$ TeV and $\tau~\sim~{\rm~10^{28}}$ s. We also obtain constraints on DM lifetime and the distance of the local DM subhalo by comparison with DAMPE data.