Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 316: Dunkle Materie und Axionen

T 316.6: Vortrag

Mittwoch, 7. März 2007, 18:05–18:20, HS Mathematik

Neutralino Annihilation to Cosmic Rays and possible Constraints on the MSSM — •Chan Hoon Chung, Henning Gast, Jan Olzem, and Stefan Schael — I. Physikalisches Institut B, RWTH-Aachen, 52074 Aachen

Antimatter CRs are expected as secondary products of interactions of the primary CRs with the interstellar medium during propagation. While the present measurements of cosmic positrons, antiprotons and diffuse gamma rays have gradually become precise, the results still do not match with the pure secondary origins. If SUSY is realized in nature, the lightest neutralino annihilations could lead to SM particles such as positrons, antiprotons and gamma-rays in CRs. In this talk, we will show the combination of the positron fraction, antiproton and diffuse gamma-ray data give constraints on the mSUGRA parameter space. An analysis of the combined CR data gives a best χ² fit on the light neutralino mass in the focus point region in agreement with the relic abundance constrained from WMAP3 and 2dFGRS. Further, the positive SUSY contribution to rare decays of b→ s γ and g_µ − 2 are also compatible with present experimental data. The Alpha Magnetic Spectrometer(AMS-02) is a particle physics detector designed to measure the CR spectra up to TV region on the International Space Station(ISS) for three years mission starting in 2009. Its exceptional precision in the measuring antimatter as well as gamma-rays will greatly reduce the uncertainties in the background determination to an unprecedented level of accuracy and the prospects for indirect detection of dark matter from the CR spectra will be considerably enhanced.