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SUMMARY:Quentin Riffard - Direct detection of dark matter with the DarkSide program
DESCRIPTION:A large number of astrophysical and cosmological observations at different scales supports the existence of a cold dark matter component in the Universe. At the Universe scale\, this component is uniformly distributed and represents roughly 26% of the total mass-energy density of the Universe. The Weakly Interacting Massive Particle (WIMP)\, a generic particle\, is one of the leading dark matter particle candidates: a massive particle interacting only through weak and gravitational interactions. This candidate is supported by the so-called “WIMP miracle” and could also be supported in particle physics by supersymmetric models. At the Milky Way scale\, dark matter forms a static halo surrounding our galaxy. The relative motion of the solar system through the dark halo produces a flux of WIMP on Earth. Through the weak interaction\, WIMP could interact with ordinary matter producing nuclear recoils (NR) by elastic scattering. In the last two decades\, a large experimental effort has been deployed by international collaborations in order to probe a direct detection of NR from WIMP-nucleus interactions. In this experimental context\, multi-tone noble liquid TPC are good candidate for the dark matter searches. The DarkSide program is a step approach program aiming to build a large TPC filled with liquid argon (LAr). The first part of this presentation focuses on the potential of LAr as a target for dark matter searches\, on the latest results from the DS-50 detector and the perspectives of the DarkSide program: the DS-20k detector. For a complete understanding of LAr data\, the characterisation of several parameters is fundamental such as the scintillation efficiency for NR and the pulse-shape parameter for the NR/ER discrimination is fundamental. In order to improve the knowledge on these parameters\, the ARIS collaboration built a small LAr double-phase TPC. A first data taking with mono chromatic neutrons was performed in Orsay (France) in last October. The second part of this presentation presents a status of the ARIS data analysis and a discussion of the strategy to extract the parameters.
URL:https://inpa.lbl.gov/event/quentin-riffard/
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