Cosmic ray $e^{+}{e}^{-}$ spectrum excess and peak feature observed by the DAMPE experiment from dark matter

Abstract

The Chinese satellite Wukong, also known as the DArk Matter Particle Explorer (DAMPE), has released its observation data of the cosmic ray (CR) electrons and positrons. The data shows an excess in the energy spectrum up to TeV energy, and possibly a peak-like fine structure at $\sim 1.4 \TeV$. We investigate the scenario that the source of the excess comes from dark matter annihilation or decay. We find that the annihilation or decay of diffuse dark matter particles in the Galactic halo can give excellent ($W^{+}{W}^{-}$ channel) or at least good (double ${\tau }^{+}{\tau }^{-}$ channel) fits to the broad excess. However, the annihilation cross-section is $10^{-23}\cm^3s^{-1}$, larger than required for getting the correct relic abundance. We then study whether the narrow peak at $\sim 1.4\TeV$ could be explained by a nearby subhalo, which thanks to the smaller distance, could supply $e^{+}{e}^{-}$ within a narrow energy range. We find that in order to produce a peak width less than the energy bin width (0.2 TeV), the source must be located within $r\lsim 0.53~\kpc$. Our global fit models do not produce the peak-like feature, instead at 1.4 TeV the spectrum show either a slope or a cliff-like feature. However, if less than optimal fit is allowed, the peak-like feature could be generated. Furthermore, an excellent fit with peak could be obtained with model B if the background is rescaled. If the dark matter decay and annihilation rates are determined using the broad excess, the required subhalo mass $\sim 10^5{M}_{\odot }$ for decay model, or $\sim10^{4.5}\Msun$ for annihilation model and a shallower density profile slope $\alpha =1.2$, or $\sim10^{2.5}\Msun$ for the steep density profile $\alpha =1.7$. However, the probability for the existence of a such nearby subhalo as massive as given above is very low.

17 pages, 17 figures, replaced with PRD accepted version

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Cited by in corpus (13)

• Multi-Component Dark Matter in a Non-Abelian Dark Sector
• Flavor Structure of the Cosmic-Ray Electron/Positron Excesses at DAMPE
• DAMPE squib? Significance of the 1.4 TeV DAMPE excess
• Ruling out $\sim 100-300$ GeV thermal relic annihilating dark matter by radio observation of the Andromeda galaxy
• Scalar dark matter explanation of the DAMPE data in the minimal Left-Right symmetric model
• Constraining annihilating dark matter mass by the radio continuum spectral data of NGC4214 galaxy
• Probing Flavor Structure of Cosmic Ray $e^{\mp }$ Spectrum and Implications for Dark Matter Indirect Searches
• Origin of the DAMPE 1.4 TeV peak
• Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario
• Dark matter annihilation into leptons through gravity portals
• Is PSR J0855$-$4644 responsible for the 1.4 TeV electron spectral bump hinted by DAMPE?
• Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios
• Thermally produced scalar singlet as leptonphilic dark matter