PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Dark Matter and its Detection
Recent progress in the search for light Dark Matter particles in South America: DM$^2$ and CONNIE
N. Avalos* and X. Bertou
Full text: pdf
Pre-published on: February 06, 2024
Published on: March 22, 2024
The recent development of highly sensitive solid-state detectors such as Skipper CCDs has achieved single-electron event resolution, allowing the search for rare interactions with an energy threshold as low as 1.2 eV. In addition, models of dark matter (DM) with masses of a few (1-5) MeV interacting with electrons predict a diurnal modulation of single-electron events in such detectors. This modulation would be enhanced in the southern hemisphere because the DM wind comes from 40 degrees north. The DM$^2$ experiment aims to probe this region of the parameter space in Bariloche, southern Argentina, and has been recently upgraded with a 3g prototype Skipper CCD. The CONNIE experiment uses two Skipper CCDs to search for CEvNS with nuclear reactor neutrinos, but it can also probe dark matter models in the aforementioned region of the parameter space. In this paper, a short description of the expected diurnal modulation of DM is given. Current status, data, results and future perspectives for DM searches in both experiments are discussed.
DOI: https://doi.org/10.22323/1.441.0334
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