AMS02 positron excess from decaying fermion DM with local dark gauge symmetry

P. Ko; Yong Tang

doi:10.1016/j.physletb.2015.01.001

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arXiv · 1410.7657

AMS02 positron excess from decaying fermion DM with local dark gauge symmetry

P. Ko·Yong Tang

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Abstract

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 $\sim O(1-2)$ TeV decaying into a dark Higgs ($ϕ$) and an active neutrino ($ν_a$) instead of the SM Higgs boson and $ν_a$. 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 $2 m_μ< m_ϕ< 2 m_{π^0}$, 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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P. Ko, Yong Tang. 2015-01-11. AMS02 positron excess from decaying fermion DM with local dark gauge symmetry. https://doi.org/10.1016/j.physletb.2015.01.001

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