Ki-Young Choi, Hyun Min Lee, Osamu Seto
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. Due to the mixing between the singlet scalar and the Standard Model Higgs doublet, vector dark matter annihilates into W and Z boson pairs, accounting for the relic density at the resonance pole of the singlet scalar for a tiny Higgs mixing. When the singlet scalar has a quartic coupling to a heavy charged scalar, the resonance effect also enhances the annihilation cross section of vector dark matter into two photons such that Fermi-gamma ray line at about 130 GeV is obtained too. 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.
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http://arxiv.org/abs/1304.0966
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