Gamma-ray lines in 15 years of Fermi-LAT data: New constraints on Higgs portal dark matter

Luque, Pedro De La Torre, Smirnov, Juri ORCID: 0000-0002-3082-0929 and Linden, Tim (2024) Gamma-ray lines in 15 years of Fermi-LAT data: New constraints on Higgs portal dark matter PHYSICAL REVIEW D, 109 (4). l041301-. ISSN 2470-0010, 2470-0029

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Abstract

Monoenergetic $\gamma$ -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 $\gamma$ -rays. Additionally, we produce the first double-line analysis of the coupled signals from $\gamma \gamma$ and $Z\gamma$ lines, which proves particularly powerful for dark matter masses above $\sim 150\mathrm{GeV}$ . 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

Item Type:	Article
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	08 Aug 2024 13:51
Last Modified:	16 Jun 2026 19:54
DOI:	10.1103/PhysRevD.109.L041301
Open Access URL:	https://doi.org/10.1103/PhysRevD.109.L041301
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3183468
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