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  • Letter
  • Open Access

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

Pedro De La Torre Luque1,2,*, Juri Smirnov3,1,†, and Tim Linden1,‡

  • 1Stockholm University and The Oskar Klein Centre for Cosmoparticle Physics, Alba Nova, 10691 Stockholm, Sweden
  • 2Polytechnic School, Universidad San Pablo-CEU, CEU Universities, 28668 Boadilla del Monte, Spain
  • 3Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, United Kingdom

  • *pedro.delatorreluque@fysik.su.se
  • †juri.smirnov@liverpool.ac.uk
  • ‡linden@fysik.su.se
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Phys. Rev. D 109, L041301 – Published 1 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.L041301

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.

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Phys. Rev. D 109, L041301– Published 1 February, 2024
  • Received 25 September 2023
  • Accepted 8 January 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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