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Recherche indirecte et inclusive de matière noire avec le spectromètre spatial AMS-02

Abstract : AMS02 is a particle physics detector designed for 3 years of data taking abroad the International Space Station. Equipped with a superconducting magnet, it will allow to measure gamma and cosmic ray fluxes in the GeV to TeV region with high particle identification capabilities. Its performance is based on the redundancy of measurements in specific sub-detectors : a Time-Of-Flight counter, a Transition Radiation Detector, a Silicon Tracker, a Ring Imaging CHerenkov counter and an Electromagnetic calorimeter (Ecal).

The Ecal is studied in details, in particular with the qualification of a stand-alone trigger devoted to gamma ray astronomy. This system allows to increase the AMS02 sensitivity photons, and to improve the reconstruction of electromagnetic events. The analog part of the trigger system has been tested with test benches and in beam at CERN. The in-orbit calibration of the Ecal is studied, it may proceed in two steps. First, the Ecal cells responses have to be equalized with minimum ionizing particles data. Then an absolute calibration can be performed with cosmic electrons. For both the relative and the absolute calibration, possible procedures are defined and realistic calibration times are estimated.

The second part deals with the indirect searches for dark matter and the study of the AMS02 sensitivity. Dark matter stands for 84% of the Universe mass and could consist in new particles. Such particles can be naturally predicted by new physics beyond the Standard Model, like supersymmetry or extra space-time dimensions. Dark matter particles are expected to surround our Galaxy and annihilate in high density regions. These annihilations could become observable exotic primary cosmic ray sources. Searches for anomalous excesses in antiprotons, positrons, antideuterons and gamma ray fluxes will be performed by AMS02. A numerical tool allowing to perform predictions for these exotic fluxes within supersymmetry or extra-dimension is developed and is presented in details. henomenological studies regarding possible enhancements of these signals by over-dense regions of the halo have also been handled. The specific case of the clumping of dark matter particles around intermediate mass black holes has been studied, leading to quantitative predictions which are addressed. The spectrum generator is eventually used to estimate AMS02 sensitivity to dark matter signals and its capability to reconstruct the annihilation final state and thus the underlying new physics model.
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Contributor : Pierre Brun Connect in order to contact the contributor
Submitted on : Tuesday, December 18, 2007 - 3:44:29 PM
Last modification on : Friday, November 6, 2020 - 3:34:03 AM
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  • HAL Id : tel-00156831, version 3



Pierre Brun. Recherche indirecte et inclusive de matière noire avec le spectromètre spatial AMS-02. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de Savoie, 2007. Français. ⟨tel-00156831v3⟩



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