Wino Dark Matter in light of the AMS-02 2015 Data
  The AMS-02 collaboration has recently reported the antiproton to proton ratio
with improved accuracy. In view of uncertainties of the production and the
propagation of the cosmic rays, the observed ratio is still consistent with the
secondary astrophysical antiproton to proton ratio. However, it is nonetheless
enticing to examine whether the observed spectrum can be explained by a
strongly motivated dark matter, the wino dark matter. As we will show, we find
that the antiproton flux from the wino annihilation can explain the observed
spectrum well for its mass range 2.5-3 TeV. The fit to data becomes
particularly well compared to the case without the annihilation for the thermal
wino dark matter case with a mass about 3 TeV. The ratio is predicted to be
quickly decreased at the energy several hundreds of GeV, if this possibility is
true, and it will be confirmed or ruled out in near future when the AMS-02
experiment accumulates enough data at this higher energy region.
