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Dark matter search in space has been carried out for many years. Measurementsof cosmic ray photons, charged antiparticles and neutrinos are useful tools fordark matter indirect search. The antiparticle energy spectra of cosmic rayshave several exciting features such as the unexpected positron excess at energyabout 10 -- 500 GeV and the remarkably flattening antiproton/proton at energyabout 60--450 GeV precisely measured by the AMS-02 experiment, which can not beexplained simultaneously by secondary production in interstellar medium. Inthis work, we report a combined analysis of cosmic ray antiproton and positronspectra arising from dark matter on the top of a secondary production in aspatial-dependent propagation model. We discuss the systematics from antiprotonproduction cross section using the two latest Monte Carlo generators, i.e. EPOSLHC and QGSJET-II-04m, respectively. We compare their results. In the case ofEPOS LHC, we find that the dark matter pair annihilating into tau leptonschannel with 100% branching ratio is the only possible one channel scenario toexplain data. On the other hand, there is not a single possible channel in thecase of QGSJET-II-04m. We also propose possible two-channel scenarios based onthese two Monte Carlo generators.

Dark Matter Search in Space: Combined Analysis of Cosmic Ray Antiproton-to-Proton Flux Ratio and Positron Flux Measured by AMS-02