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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2308.12176 |
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| _version_ | 1866916178718359552 |
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| author | Chavarria, A. E. Lin, H. McGuire, K. J. Piers, A. Traina, M. |
| author_facet | Chavarria, A. E. Lin, H. McGuire, K. J. Piers, A. Traina, M. |
| contents | Two dark matter searches performed with charge-coupled devices (CCDs) in the DAMIC cryostat at SNOLAB reported with high statistical significance the presence of an unidentified source of low-energy events in bulk silicon. The observed spectrum is consistent with nuclear recoils from the elastic scattering of weakly interacting massive particles (WIMPs) with masses between 2 and 4 GeV. In the standard scenario of spin-independent WIMP-nucleus scattering, the derived cross section is conclusively excluded by results in argon by the DarkSide-50 experiment. We identify isospin-violating and spin-dependent scenarios where interactions with $^{40}$Ar are strongly suppressed and the interpretation of the DAMIC excess as WIMP-nucleus elastic scattering remains viable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12176 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The DAMIC excess from WIMP-nucleus elastic scattering Chavarria, A. E. Lin, H. McGuire, K. J. Piers, A. Traina, M. Cosmology and Nongalactic Astrophysics Two dark matter searches performed with charge-coupled devices (CCDs) in the DAMIC cryostat at SNOLAB reported with high statistical significance the presence of an unidentified source of low-energy events in bulk silicon. The observed spectrum is consistent with nuclear recoils from the elastic scattering of weakly interacting massive particles (WIMPs) with masses between 2 and 4 GeV. In the standard scenario of spin-independent WIMP-nucleus scattering, the derived cross section is conclusively excluded by results in argon by the DarkSide-50 experiment. We identify isospin-violating and spin-dependent scenarios where interactions with $^{40}$Ar are strongly suppressed and the interpretation of the DAMIC excess as WIMP-nucleus elastic scattering remains viable. |
| title | The DAMIC excess from WIMP-nucleus elastic scattering |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2308.12176 |