Electron - Dark Matter Scattering in an Evacuated Tube

Details Electron - Dark Matter Scattering in an Evacuated Tube Electron - Dark Matter Scattering in an Evacuated Tube

2008-06-16

arxiv.org/abs/0806.2487v1

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 2 figures. uses REVTEX

Scientific paper

The light dark matter model can explain both the primordial abundance of dark matter and the anomalous 511 keV gamma-ray signal from the galactic center. This model posits a light neutral scalar, \chi, with a mass in the range 1 MeV < Mchi < 10 MeV, as well as a light neutral spin-1 boson, U, which mediates the annihilation channel \chi\chi -> e+e-. Since the dark matter particle is light, its number density is relatively large if it accounts for a local dark matter density of 0.3 GeV/cm^3. We consider an experiment in which a low-energy, high-current electron beam is passed through a long evacuated tube, and elastic scattering of electrons off dark matter particles is observed. The kinematics of this process allow a clean separation of the signal process from scattering off residual gas in the tube, and also a direct measurement of Mchi.

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