Cosmic Ray Excesses from Multi-component Dark Matter Decays

Abstract

We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total $e^{+}+e^{-}$ flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only 2 DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total $e^{+}+e^{-}$ flux, which are also consistent with the measured diffuse $\gamma$-ray flux by Fermi-LAT.

10 pages, 1 figures, submitted to the special issue of Mod. Phys. Lett.A "Indirect Dark Matter Searches"

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Observation of an anomalous positron abundance in the cosmic radiation
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Gamma Ray Spectrum from Gravitino Dark Matter Decay
• Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies

Cited by in corpus (3)

• Strategies for Probing Non-Minimal Dark Sectors at Colliders: The Interplay Between Cuts and Kinematic Distributions
• Revisiting Multi-Component Dark Matter with New AMS-02 Data
• Introduction to the special issue of Modern Physics Letters A "Indirect dark matter searches"