Search for dark matter lines at the Galactic Center with 14 years of Fermi data

Foster, Joshua W.; Park, Yujin; Safdi, Benjamin R.; Soreq, Yotam; Xu, Weishuang Linda

doi:10.1103/PhysRevD.107.103047

Title: Search for dark matter lines at the Galactic Center with 14 years of Fermi data

Journal Article · Thu May 25 00:00:00 EDT 2023 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.107.103047· OSTI ID:1975301

;

; Soreq, Yotam; Xu, Weishuang Linda

Dark matter (DM) in the Milky Way halo may annihilate or decay to photons, producing monochromatic gamma rays. We search for DM-induced spectral lines using 14 years of data from the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope (Fermi-LAT) between 10 GeV and 2 TeV in the inner Milky Way leveraging both the spatial and spectral morphology of an expected signal. We present new constraints as strong as $$\langle$$σv$$\rangle$$ ≲ 6 × 10^-30 cm³/s for the two-to-two annihilations and τ ≳ 10³⁰ s for one-to-two decays, representing leading sensitivity between 10 GeV and ~500 GeV. We consider the implications of our line-constraints on the Galactic Center excess (GCE), which is a previously-observed excess of continuum ~GeV gamma-rays that may be explained by DM annihilation. The Higgs portal and neutralinolike DM scenarios, which have been extensively discussed as possible origins of the GCE, are constrained by our work because of the lack of observed one-loop decays to two photons. More generally, we interpret our null results in a variety of annihilating and decaying DM models, such as neutralinos, gravitinos, and glueballs, showing that in many cases the line search is more powerful than the continuum, despite the continuum annihilation being at tree level.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: DESC0019225; AC02-05CH11231; SC0019225

OSTI ID:: 1975301

Alternate ID(s):: OSTI ID: 2228869

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 107 Journal Issue: 10; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Search for dark matter lines at the Galactic Center with 14 years of Fermi data

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