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

TL;DR

This paper develops an effective theory linking dark matter interactions with photons, aiming to explain FermiLAT spectral features and predict LHC gamma plus missing energy signals, and assesses their consistency with experimental data.

Contribution

It introduces a novel effective theory connecting dark matter and photon interactions, unifying astrophysical and collider observations.

Findings

The theory can explain the FermiLAT gamma-ray feature.

Predicted LHC signals are consistent with existing ATLAS data.

Constraints on dark matter-photon couplings are derived.

Abstract

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