Inert Higgs Doublet Dark Matter in Type-II Seesaw

Chuan Hung Chen, Takaaki Nomura

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1 Citation (Scopus)


Weakly interacting massive particle (WIMP) as a dark matter (DM) candidate is further inspired by recent AMS-02 data, which confirm the excess of positron fraction observed earlier by PAMELA and Fermi-LAT experiments. Additionally, the excess of positron+electron flux is still significant in the measurement of Fermi-LAT. For solving the problem of massive neutrinos and observed excess of cosmic-ray by DM annihilation, we study the model with an inert Higgs doublet (IHD) in the framework of type-II seesaw mechanism by imposing a Z2 symmetry on the IHD, where the lightest particle of IHD is the DM candidate while the neutrino masses origin from the Higgs triplet in type-II seesaw model. We calculate the cosmic-ray production in our model and find that if leptonic triplet decays are dominant, the observed excess of positron/electron flux could be explained well in normal ordered neutrino mass spectrum, when the constraints of DM relic density and comic-ray antiproton spectrum are taken into account.

Original languageEnglish
Pages (from-to)2348-2350
Number of pages3
JournalNuclear and Particle Physics Proceedings
Publication statusPublished - 2016 Apr 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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