Vector Higgs-portal dark matter and Fermi-LAT gamma ray line

Abstract

We propose a renormalizable model for vector dark matter with extra U(1) gauge symmetry, which is broken by the VEV of a complex singlet scalar. When the singlet scalar has a quartic coupling to a heavy charged scalar, the resonance effect enhances the annihilation cross section of vector dark matter into two photons such that Fermi-gamma ray line at about 130 GeV is obtained. In the presence of a tiny mixing between the singlet scalar and the Standard Model Higgs doublet, the relic density is determined dominantly by WW/ZZ and two-photon channels near the resonance pole of the singlet scalar. We also show that various phenomenological bounds coming from the Higgs to diphoton decay rate, precision data and collider searches for the charged scalar and vacuum stability are satisfied in the model.

22 pages, 14 figures, To appear in Phys. Rev. D

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• Decaying Vector Dark Matter as an Explanation for the 3.5 keV Line from Galaxy Clusters
• Geometric Dark Matter
• Torsion as a Dark Matter Candidate from the Higgs Portal
• DAMPE Excess from Leptophilic Vector Dark Matter: Model Independent Approach
• Vector Dark Matter in a $U(1{)}_X$ extended 2HDM