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We describe an effective theory of interaction between pairs of dark matterparticles and pairs of photons. Such an interaction could accomodate$\chi\bar{\chi}\rightarrow\gamma\gamma$ processes which might be the cause ofthe observed feature in the FermiLAT spectrum, as well as$\gamma^*/Z\rightarrow \gamma\chi\bar{\chi}$ processes, which would predictexcesses at the LHC in the $\gamma+\missET$ final-state. We reinterpret anATLAS $\gamma+\missET$ analysis and the observed Fermi feature in the parameterspace of our new effective theory to assess their consistency.

Confronting the Fermi Line with LHC data: an Effective Theory of Dark Matter Interaction with Photons