Multicomponent Dark Matter in the Light of CALET and DAMPE

Abstract

In the light of the latest measurements on the total $e^{+}+e^{-}$ flux by CALET and DAMPE experiments, we revisit the multicomponent leptonically decaying dark matter (DM) explanations to the cosmic-ray electron/positron excesses observed previously. Especially, we use the single and double-component DM models to explore the compatibility of the AMS-02 positron fraction with the new CALET or DAMPE data. It turns out that neither single nor double-component DM models are able to fit the AMS-02 positron fraction and DAMPE total $e^{+}+e^{-}$ flux data simultaneously. On the other hand, for the combined AMS-02 and CALET dataset, both the single and double-component DM models can provide reasonable fits. If we further take into the diffuse ${\hat{I}}^3$-ray constraints from Fermi-LAT, only the double-component DM models are allowed.

23 pages, 4 figures; Comments are added and typos are fixed; published version