Hong-Bo Jin, Yue-Liang Wu, Yu-Feng Zhou
In light of the first release of high precision measurement on the positron fraction from the AMS-02 experiment, we perform a detailed global analysis on the interpretation of the latest data of PAMELA, Fermi-LAT, and AMS-02 in terms of dark matter (DM) annihilation and decay using the GALPROP code. The allowed regions for the DM mass and its annihilation cross section or decay life-time are obtained for leptonic final states $2e$, $2\mu$, $2\tau$, $4e$, $4\mu$ and $4\tau$. We show that for DM annihilation into electron and muon final states, the AMS-02 data alone favour a DM mass $\sim 300-400$ GeV, which is significantly different from that favoured by the Fermi-LAT data on the total flux of electrons and positrons. The allowed regions by the two experiments do not overlap at 99.99999% C.L., which is insensitive to the changes in the normalization and slope of the conventional astrophysical background. Consistent fits are obtained for $2\tau$ and $4\tau$ final states, which favours TeV scale DM with large cross sections above $\sim 3\times 10^{-23} \text{cm}^3\text{s}^{-1}$. For all the considered leptonic channels, the current data favour DM annihilation over DM decay, and show no indication of charge asymmetric DM decay.
View original:
http://arxiv.org/abs/1304.1997
No comments:
Post a Comment