Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 17: Astroparticle Physics

HK 17.4: Talk

Monday, March 16, 2009, 17:45–18:00, H-ZO 70

Probing light dark matter by e⁻ p scattering — •Tobias Beranek, Achim Denig, and Marc Vanderhaeghen — Institut für Kernphysik, Johannes-Gutenberg Universität, 55099 Mainz

Gamma radiation from the galactic center around 511 keV has been observed for more than thirty years. These data imply that the 511 keV emission line is caused by annihilating low-energy positrons. Recent measurements of SPI spectrometer at the INTEGRAL probe confirm this hypothesis. The number of positrons in the galactic center is not large enough to explain the γ ray intensity in a simple way. A possible explanantion of this observation assumes a new gauge boson U and scalar dark matter particles φ with mass of 10   −   100 MeV. The U boson couples to the Standard model particles as well as to the light dark matter particles φ.
We analyse the process e⁻ p → e⁻ p  U as a background process to elastic scattering e⁻ p → e⁻ p and make a feasibility study for an experimental realization at the MAMI accelerator facility at Mainz. Simulations for the parameter space resulting from various theoretical approaches to light dark matter will be shown.