科研之友
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摘要
We study the possible positron/electron excesses within the multi-component leptonically decaying dark matter (DM) scenario by fitting the most recent AMS-02 data on the positron fraction and total e(+) + e(-) flux. We show that both the single- and two-component DM models are able to fit the two AMS-02 datasets. However, the single-component DM model favors the e(+)/e(-) energy cutoff from the DM decay less than 1 TeV through the t-channel, which is already well constrained by the diffuse gamma-ray spectrum measured by Fermi-LAT. For the two-component case with closing the t-mode for the heavy DM particle, we find that the new AMS-02 data allows the heavy DM cutoff larger than 1 TeV, providing a good description of the high-energy behavior of the total e(+) + e(-) flux and satisfying the diffuse gamma-ray constraint.
