New 511 keV line data provides strongest sub-GeV dark matter constraints
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arXiv
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| Format: | Preprint |
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2023
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| author | Luque, Pedro De la Torre Balaji, Shyam Silk, Joseph |
| author_facet | Luque, Pedro De la Torre Balaji, Shyam Silk, Joseph |
| contents | We explore the $511$~keV emission associated to sub-GeV dark matter (DM) particles that can produce electron-positron pairs and form positronium after thermalizing. We use $\sim16$~yr of SPI data from INTEGRAL to constrain DM properties, considering the full positron propagation and losses, and the free electron density drop away from the Galactic plane. We show that the predicted longitude and latitude profiles vary significantly for different DM masses, unlike previous assumptions, and obtain the strongest limits on sub-GeV DM (from the MeV to a few GeV) so far, excluding cross-sections down to $\langle σv \rangle \lesssim10^{-32}$ cm$^3$ s$^{-1}$ for $m_χ\sim1\,\text{MeV}$ and $\langle σv \rangle \lesssim10^{-26}$ cm$^3$ s$^{-1} $ for $m_χ\sim5\,\text{GeV}$ and lifetimes up to $τ\gtrsim 10^{29}\, \textrm{s} \, (m_χ\sim1\,\text{MeV}) $ and $τ\gtrsim 10^{27}\,\textrm{s}$ ($m_χ\sim5$~GeV) for the typical Navarro-Frenk-White DM profile. Our derived limits are robust within a factor of a few due to systematic uncertainties. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_04907 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | New 511 keV line data provides strongest sub-GeV dark matter constraints Luque, Pedro De la Torre Balaji, Shyam Silk, Joseph High Energy Physics - Phenomenology High Energy Astrophysical Phenomena We explore the $511$~keV emission associated to sub-GeV dark matter (DM) particles that can produce electron-positron pairs and form positronium after thermalizing. We use $\sim16$~yr of SPI data from INTEGRAL to constrain DM properties, considering the full positron propagation and losses, and the free electron density drop away from the Galactic plane. We show that the predicted longitude and latitude profiles vary significantly for different DM masses, unlike previous assumptions, and obtain the strongest limits on sub-GeV DM (from the MeV to a few GeV) so far, excluding cross-sections down to $\langle σv \rangle \lesssim10^{-32}$ cm$^3$ s$^{-1}$ for $m_χ\sim1\,\text{MeV}$ and $\langle σv \rangle \lesssim10^{-26}$ cm$^3$ s$^{-1} $ for $m_χ\sim5\,\text{GeV}$ and lifetimes up to $τ\gtrsim 10^{29}\, \textrm{s} \, (m_χ\sim1\,\text{MeV}) $ and $τ\gtrsim 10^{27}\,\textrm{s}$ ($m_χ\sim5$~GeV) for the typical Navarro-Frenk-White DM profile. Our derived limits are robust within a factor of a few due to systematic uncertainties. |
| title | New 511 keV line data provides strongest sub-GeV dark matter constraints |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2312.04907 |