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

According to the recent Plank observation , non-baryonic dark matter (DM) comprises ~26% of the universe’s mass energy . Distinguishing the DM signal from the astrophysical contribution is the key to indirect detection of DM . Dark Matter Particle Explorer (DAMPE) published the highly accurate measurements of cosmic ray electron flux between 25 GeV and 4.6 TeV. A sharp peak exist at ~ 1.4 TeV. The decaying-DM model adopt to explain the unexpected peak .

The decay products of the local DM subhalo could contribute to the DMAPE peak with= 3 TeV and τ ～s . The local DM subhalo should not be beyond 0.2kpc form solar system with m = .

We also obtain constraints on DM lifetime and the distance of the local DM subhalo by comparison with DAMPE data.

By with PAN Xu

Fig.1 The CR-electrons plus positrons flux with best-fit parameters,compared with the

AMS-02 and DAMPE data.

The work by PAN Xu , ZHANG Cun, etc. accepted by SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, has been published online ( https://link.springer.com/article/10.1007%2Fs11433-018-9257-3)