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Détection directe et indirecte de matière sombre supersymétrique

Abstract : A substantial body of astrophysical evidence supports the existence of non-baryonic dark matter in the Universe. One of the leading dark matter candidates is the neutralino predicted by the supersymmetric extensions of the Standard Model of particle physics. Different detectors have been designed for the detection, either indirect or direct, of the neutralino. Related to indirect detection, the present work has been performed in the context of the AMS experiment. A precursor version of the spectrometer was flown on the space shuttle Discovery in June 1998. The detector included an Aerogel Threshold Cherenkov (ATC) counter to identify antiprotons, whose spectrum may be used to infer a neutralino signal. The analysis of the ATC data is presented including an evaluation of the flight performance and a description of the optimization of the antiproton selection. An antiproton analysis is also reported. A phenomenological study allows to investigate the discovery potential of this indirect method. This thesis also includes the development of a new detector (MACHe3) designed for direct neutralino search using a superfluid He3 bolometer operated at ultra low temperatures. The data analysis of the prototype cell is presented. A Monte Carlo simulation has been developed, in order to optimize the detector design for direct neutralino search. These results are compared with theoretical predictions of supersymmetric models, thus highlighting the discovery potential of this detector and its complementarity with existing devices.
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https://tel.archives-ouvertes.fr/tel-00000898
Contributor : Frederic Mayet <>
Submitted on : Tuesday, December 4, 2001 - 6:03:13 PM
Last modification on : Thursday, November 19, 2020 - 12:58:40 PM
Long-term archiving on: : Wednesday, November 23, 2016 - 9:42:21 AM

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  • HAL Id : tel-00000898, version 1

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UJF | LPSC | CNRS | IN2P3 | GEPI | UGA

Citation

F. Mayet. Détection directe et indirecte de matière sombre supersymétrique. Physique des Hautes Energies - Expérience [hep-ex]. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00000898⟩

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