Radiatively decaying scalar dark matter through U(1) mixings and the Fermi 130 GeV gamma-ray line

Abstract

In light of the recent observation of the Fermi-LAT 130 GeV gamma-ray line, we suggest a model of scalar dark matter in hidden sector, which can decay into two (hidden) photons. The process is radiatively induced by a GUT scale fermion in the loop, which is charged under a hidden sector U(1), and the kinetic mixing ($\sim \epsilon F^{\mu \nu }{F}_{\mu \nu }^{\prime }$) enables us to fit the required decay width for the Fermi-LAT peak. The model does not allow any dangerous decay channels into light standard model particles.

15 pages, 6 figures, Discussion on the morphology of 130 GeV gamma-rays: decay vs annihilation, references added

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