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Mesure du spectre de positons cosmiques avec l'expérience AMS-02 et recherche de signaux "exotiques"

Abstract : The AMS-02 experiment is a particle physic detector which will be installed on the international space station (ISS) in 2008 for at least 3 years. The physics motivations are cosmic ray measurements (e-, e+, p, p-bar, gamma, He, C,...), antimatter search for Z>2 and gamma ray studies from GeV to TeV. The HEAT experiment has measured positron spectrum up to 30 GeV, and shown a possible distorsion around 8 GeV, which can be interpreted as a dark matter signal. The cosmic positrons spectrum measurement needs positron/proton separation close to 10^5, which will be obtained combining all AMS-02 sub-detectors. A neural network analysis has been developed on test beam data taken in 2002, to estimate the electron/proton rejection for the electromagnetic calorimeter. This technique, based on discriminant variables and which was tuned on data, was used to determine the positron acceptance combining other sub-detectors informations. The number of conventional positrons can be estimated and AMS ability to detect cold dark matter signals has be determined. This study was presented for signal from supersymmetric neutralino and from Kaluza-Klein stable particles. Fluxes are naturally too low to be detected. Signal can be enhanced thanks to local dark matter over-densities which appear naturally in galaxy formation models. A model for those over-densities has been tuned and presented.
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https://tel.archives-ouvertes.fr/tel-00010164
Contributor : Jonathan Pochon <>
Submitted on : Thursday, September 15, 2005 - 7:55:37 PM
Last modification on : Friday, November 6, 2020 - 3:29:12 AM
Long-term archiving on: : Friday, September 14, 2012 - 2:25:09 PM

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Jonathan Pochon. Mesure du spectre de positons cosmiques avec l'expérience AMS-02 et recherche de signaux "exotiques". Physique des Hautes Energies - Expérience [hep-ex]. Université Claude Bernard - Lyon I, 2005. Français. ⟨tel-00010164⟩

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