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We explore the relationship between astrophysical gamma-ray signals and LHCsignatures for a class of phenomenologically successful secluded dark mattermodels, motivated by recent evidence for a ~130 GeV gamma-ray line. We considerin detail scenarios in which interactions between the dark sector and thestandard model are mediated by a vev-less scalar field \phi, transforming as anN-plet (N > 3) under SU(2)_L. Since some of the component fields of \phi carrylarge electric charges, loop induced dark matter annihilation to \gamma \gammaand \gamma Z can be enhanced without the need for non-perturbatively largecouplings, and without overproduction of continuum gamma-rays from other finalstates. We discuss prospects for other experimental tests, including darkmatter-nucleon scattering and production of \phi at the LHC, where futuresearches for anomalous charged tracks may be sensitive. The first LHC hintscould come from the Higgs sector, where loop corrections involving \phi lead tosignificantly modified h to \gamma \gamma and h to \gamma Z branching ratios.

From gamma ray line signals of dark matter to the LHC