2025-08-19 シカゴ大学（UChicago）
＜関連情報＞
- https://news.uchicago.edu/story/deep-beneath-french-alps-scientists-hunt-dark-matter
- https://journals.aps.org/prl/abstract/10.1103/2tcc-bqck
DAMIC-Mを用いた隠れたセクター暗黒物質のベンチマークモデルの評価 Probing Benchmark Models of Hidden-Sector Dark Matter with DAMIC-M
K. Aggarwal, I. Arnquist, N. Avalos, X. Bertou,, N. Castelló-Mor, A. E. Chavarria, J. Cuevas-Zepeda, A. Dastgheibi-Fard, C. De Dominicis et al.(DAMIC-M Collaboration)
Physical Review Letters Published:13 August, 2025
DOI: https://doi.org/10.1103/2tcc-bqck
Abstract
We report on a search for sub-GeV dark matter (DM) particles interacting with electrons using the DAMIC-M prototype detector at the Modane Underground Laboratory. The data feature a significantly lower detector single − rate (factor 50) compared to our previous search, while also accumulating a 10 times larger exposure of ∼1.3 kg−day. DM interactions in the skipper charge-coupled devices (CCDs) are searched for as groups of two or three adjacent pixels with a total charge between 2 and 4 −. We find 144 candidates of 2 − and 1 candidate of 4 −, where 141.5 and 0.071, respectively, are expected from background. With no evidence of a DM signal, we place stringent constraints on DM particles with masses between 1 and 1000 MeV/2 interacting with electrons through an ultralight or heavy mediator. For large ranges of DM masses below 1 GeV/2, we exclude theoretically motivated benchmark scenarios where hidden-sector particles are produced as a major component of DM in the Universe through the freeze-in or freeze-out mechanisms.
