Abstract
Monoenergetic γ-ray spectral lines are among the cleanest signatures of dark matter annihilation. We analyze 15 years of Fermi-LAT data, find no spectral lines, and place strong constraints on dark matter annihilation to monoenergetic γ-rays. Additionally, we produce the first double-line analysis of the coupled signals from γγ and Zγ lines, which proves particularly powerful for dark matter masses above ∼150 GeV. From our constraints on a double-line feature, we investigate and constrain some minimal models where the Galactic Center Excess can be fit by dark matter annihilation through the Higgs boson into Standard Model particles. Published by the American Physical Society 2024
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