Two Lines or Not Two Lines? That is the Question of Gamma Ray Spectra

Abstract

Lines in the spectrum of cosmic gamma rays are considered one of the more robust signatures of dark matter annihilation. We consider such processes from an effective field theory vantage, and find that generically, two or more lines are expected, providing an interesting feature that can be exploited for searches and reveal details about the underlying theory of dark matter. Using the 130 GeV feature recently reported in the Fermi-LAT data as an example, we analyze the energy spectrum in the multi-line context and find the data to be consistent with a single $\gamma \gamma$ line, a single $\gamma Z$ line or both a $\gamma \gamma$ and a $\gamma Z$ line.

7 pages, 5 figures

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• Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation
• Disentangling Instrumental Features of the 130 GeV Fermi Line
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• Indirect dark-matter detection with MadDM v3.2 -- Lines and Loops
• Dark Matter Search at Colliders and Neutrino Floor
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