Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 94: Kosmische Strahlung 4

T 94.2: Vortrag

Montag, 4. März 2013, 17:00–17:15, WIL-B321

Analysis of charge-sign separation in AMS-02 data — •Andreas Bachlechner — RWTH Aachen University

The AMS-02 experiment stationed at the International Space Station is taking cosmic-ray data since May 2011.

Promising observables to improve the understanding of cosmic rays, antimatter-matter asymmetry and search for dark matter include the positron fraction, the antiproton to proton ratio and anti-helium search. For these observables a proper separation of charge sign up to the high energies is of great importance.

For leptons the kinetic energy is determined redundantly by two sub-detectors: The electromagnetic calorimeter with 16 radiation lengths and the powerful spectrometer consisting of a silicon strip tracker combined with a permanent magnet. On the other hand the spectrometer is the only sub-detector in AMS-02 able separate particles according to their charge sign. This separation is limited by the resolution of the spectrometer and interactions in the detector. The resulting charge confusion needs to be understood and carefully taken into account.

The preliminary results of this analysis to determine charge confusion from measured data and methods to correct for this misidentification will be presented. The effect of charge confusion to the positron fraction and the antiproton proton ratio will be discussed.