AMS02 positron excess from decaying fermion DM with local dark gauge symmetry
Ko, P. · Tang, Yong
Original · EN
Positron excess observed by PAMELA, Fermi and AMS02 may be due to dark matter (DM) pair annihilation or decay dominantly into muons. In this paper, we consider a scenario with thermal fermionic DM (χ) with mass O(1-2) TeV decaying into a dark Higgs (ϕ) and an active neutrino (νₐ) instead of the SM Higgs boson and νₐ. We first present a renormalizable model for this scenario with local dark U(1)ₓ gauge symmetry, in which the DM χ can be thermalized by Higgs portal and the gauge kinetic mixing. Assuming the dark Higgs (ϕ) mass is in the range 2 mμ< mϕ< 2 mπ₀, the positron excess can be fit in a natural manner without conflict with constraints from antiproton and gamma ray fluxes or direct detection experiments. Also having such a light dark Higgs, the self-interaction of DM can be enhanced to some extent, and three puzzles in the CDM paradigm can be somewhat relaxed.
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