PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Dark Matter and its Detection
Search for annual modulation of the event rate generated by dark matter in the DarkSide-50 ionization signal
T. Hugues*  on behalf of the DarkSide-50 Collaboration
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Pre-published on: February 26, 2024
Published on: March 22, 2024
DarkSide-50 is a direct detection experiment at LNGS in Italy searching for dark matter. It utilizes a dual-phase argon time projection chamber. On the basis of the ionization spectrum alone, it
has established the most stringent exclusion limit for dark matter candidates with masses below \(1.4 GeV/c^2\). By exploiting the expected variation of the relative velocity between dark matter and Earth, one can search for dark matter in a model-independent manner. We describe the first search for such an event rate modulation with argon using the DarkSide-50 ionization signal. Likelihood and Lomb–Scargle analyses were used to look for a 1 year period peaking at June 2nd. As a result of years of stable operation of the detector and a thorough knowledge of its response, we were able to obtain the lowest energy threshold, \(0.04 keV_{𝑒𝑒}\), ever achieved in this kind of experiments.

DOI: https://doi.org/10.22323/1.441.0079
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