Dark matter for excess of AMS-02 positrons and antiprotons

Chuan-Hung Chen; Cheng-Wei Chiang; Takaaki Nomura

doi:10.1016/j.physletb.2015.06.035

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arXiv · 1504.07848

Dark matter for excess of AMS-02 positrons and antiprotons

Chuan-Hung Chen·Cheng-Wei Chiang·Takaaki Nomura

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Abstract

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 $Z_3$ 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.

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Chuan-Hung Chen, Cheng-Wei Chiang, Takaaki Nomura. 2015-06-23. Dark matter for excess of AMS-02 positrons and antiprotons. https://doi.org/10.1016/j.physletb.2015.06.035

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