We propose a dark matter explanation to simultaneously account for the excess
of antiproton-to-proton and positron power spectra observed in the AMS-02
experiment while having the right dark matter relic abundance and satisfying
the current direct search bounds. We extend the Higgs triplet model with a
hidden gauge symmetry of SU(2)X that is broken to Z3 by a quadruplet
scalar field, rendering the associated gauge bosons stable weakly-interacting
massive particle dark matter candidates. By coupling the complex Higgs triplet
and the SU(2)X quadruplet, the dark matter candidates can annihilate into
triplet Higgs bosons each of which in turn decays into lepton or gauge boson
final states. Such a mechanism gives rise to correct excess of positrons and
antiprotons with an appropriate choice of the triplet vacuum expectation value.
Besides, the model provides a link between neutrino mass and dark matter
phenomenology.Comment: 12 pages, 3 figures, references and comments added, version to appear
in Phys. Lett.