Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 63: Kosmische Strahlung III

T 63.4: Vortrag

Dienstag, 1. März 2016, 17:35–17:50, VMP9 SR 29

Search for Positron Anisotropies in Cosmic Rays with AMS — •Fabian Machate — 1. Physikalisches Institut B, RWTH Aachen University

The Alpha Magnetic Spectrometer (AMS-02) on the International Space Station has observed a significant excess of cosmic ray positrons over the background expected from secondary production at energies above 10 GeV. Nearby pulsars and annihilating dark matter particles as a primary source of electrons and positrons have been discussed as an explanation. A possible way of distinguishing between pulsar and dark matter origin is the measurement of dipole anisotropies in the positron flux or the positron to electron ratio. Any anisotropy will be reduced by diffusion in galactic magnetic fields to below the percent level.

AMS-02 is the leading space-based experiment for cosmic ray detection and well suited for this search. A new analysis procedure for anisotropies using an event sample with large acceptance will be presented. It relies on the ability of the Transition Radiation Detector (TRD) to separate positrons from the proton background.