DAMPE excess from decaying right-handed neutrino dark matter

Abstract

The flux of high-energy cosmic-ray electrons plus positrons recently measured by the DArk Matter Particle Explorer (DAMPE) exhibits a tentative peak excess at an energy of around $1.4$ TeV. In this paper, we consider the minimal gauged $U(1{)}_{B-L}$ model with a right-handed neutrino (RHN) dark matter (DM) and interpret the DAMPE peak with a late-time decay of the RHN DM into $e^{\pm }{W}^{\mp }$. We find that a DM lifetime ${\tau }_{DM}\sim 10^{28}$ s can fit the DAMPE peak with a DM mass $m_{DM}=3$ TeV. This favored lifetime is close to the current bound on it by Fermi-LAT, our decaying RHN DM can be tested once the measurement of cosmic gamma ray flux is improved. The RHN DM communicates with the Standard Model particles through the $U(1{)}_{B-L}$ gauge boson ($Z^{\prime }$ boson), and its thermal relic abundance is controlled by only three free parameters: $m_{DM}$, the $U(1{)}_{B-L}$ gauge coupling (${\alpha }_{BL}$), and the $Z^{\prime }$ boson mass ($m_{Z^{\prime }}$). For $m_{DM}=3$ TeV, the rest of the parameters are restricted to be $m_{Z^{\prime }}\simeq 6$ TeV and $0.00807\le {\alpha }_{BL}\le 0.0149$, in order to reproduce the observed DM relic density and to avoid the Landau pole for the running ${\alpha }_{BL}$ below the Planck scale. This allowed region will be tested by the search for a $Z^{\prime }$ boson resonance at the future Large Hadron Collider.

13 pages, 2 figures, the final journal version

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• Gravitational waves from breaking of an extra $U(1)$ in $SO(10)$ grand unification
• The DAMPE excess and gamma-ray constraints
• Two-mediator dark matter models and cosmic electron excess
• Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario
• Dark matter annihilation into leptons through gravity portals
• The CP violation and scalar dark matter in a 331 model
• Multicomponent Dark Matter in the Light of CALET and DAMPE