Testing Thermal-Relic Dark Matter with a Dark Photon Mediator
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915276321193984 |
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| author | Krnjaic, Gordan |
| author_facet | Krnjaic, Gordan |
| contents | In light of recent DAMIC-M results, we present the status of thermal-relic dark matter $χ$ coupled to a kinetically-mixed dark photon $A^\prime$. In the predictive "direct annihilation" regime, $m_{A'} > m_χ$, the relic abundance depends on the kinetic mixing parameter, and there is a minimum value compatible with thermal freeze out. Using only electron and nuclear recoil direct detection results, we find that for complex scalar dark matter, the direct-annihilation regime is now excluded for nearly all values of $m_χ$; the only exception is the resonant annihilation regime where $m_{A'}\approx 2 m_χ$. Direct annihilation relic targets for other representative models, including Majorana and Pseudo-Dirac candidates, remain viable across a wide range of model parameters, but will be tested with a combination of dedicated accelerator searches in the near future. In the opposite "secluded annihilation" regime, where $m_χ> m_{A'}$, this scenario is excluded by cosmic microwave background measurements for all $m_χ\lesssim 30$ GeV. Similar conclusions in both the direct and secluded regimes hold for all anomaly-free vector mediators that couple to the first generation of electrically-charged Standard Model particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04626 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing Thermal-Relic Dark Matter with a Dark Photon Mediator Krnjaic, Gordan High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment In light of recent DAMIC-M results, we present the status of thermal-relic dark matter $χ$ coupled to a kinetically-mixed dark photon $A^\prime$. In the predictive "direct annihilation" regime, $m_{A'} > m_χ$, the relic abundance depends on the kinetic mixing parameter, and there is a minimum value compatible with thermal freeze out. Using only electron and nuclear recoil direct detection results, we find that for complex scalar dark matter, the direct-annihilation regime is now excluded for nearly all values of $m_χ$; the only exception is the resonant annihilation regime where $m_{A'}\approx 2 m_χ$. Direct annihilation relic targets for other representative models, including Majorana and Pseudo-Dirac candidates, remain viable across a wide range of model parameters, but will be tested with a combination of dedicated accelerator searches in the near future. In the opposite "secluded annihilation" regime, where $m_χ> m_{A'}$, this scenario is excluded by cosmic microwave background measurements for all $m_χ\lesssim 30$ GeV. Similar conclusions in both the direct and secluded regimes hold for all anomaly-free vector mediators that couple to the first generation of electrically-charged Standard Model particles. |
| title | Testing Thermal-Relic Dark Matter with a Dark Photon Mediator |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2505.04626 |