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July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Experimental method to measure the positron and electron fluxes in AMS-02

Jul 30, 2015, 3:30 PM
1h
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 244
Poster contribution CR-EX Poster 1 CR

Speaker

Sami Caroff (Centre National de la Recherche Scientifique (FR))

Description

The Alpha Magnetic Spectrometer AMS-02 is a high energy particle physics detector, operational on the International Space Station since May 2011. The AMS-02 goal is the fundamental physics research in space with high energy cosmic rays, during its 20 year duration mission. The latest published results, with 30 months of data, show an excess of high energy positrons whose origin is still highly uncertain. These positrons, in addition to being produced by spallation of cosmic rays on interstellar medium, may be produced in nearby pulsars, annihilation of Dark Matter particles, or still unknow processes. In this poster, I will review the analysis technique used for measuring positron flux and electron flux, as well as positron fraction. This analysis is based on three subdetectors: the Transition Radiation Detector (TRD), the silicium tracker, and the Electromagnetic Calorimeter (ECal). I will present a method which allows the combination of estimators constructed from these three subdetectors, in order to separate first leptons and protons, and secondly positrons and electrons. I will also detail the influence and the determination of the charge confusion between the positrons and electrons at high energy. The positron and electron flux, as well as the positron fraction, will be shown and discussed.
Collaboration AMS
Registration number following "ICRC2015-I/" 0935

Primary author

Sami Caroff (Centre National de la Recherche Scientifique (FR))

Presentation materials

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