Model-independent determination of the WIMP mass from direct dark matter detection data
- Physikalisches Institut der Universitaet Bonn, Nussallee 12, D-53115 Bonn (Germany)
Weakly interacting massive particles (WIMPs) are one of the leading candidates for dark matter. We develop a model-independent method for determining the mass m{sub {chi}} of the WIMP by using data (i.e. measured recoil energies) of direct detection experiments. Our method is independent of the as yet unknown WIMP density near the Earth, of the form of the WIMP velocity distribution, as well as of the WIMP-nucleus cross section. However, it requires positive signals from at least two detectors with different target nuclei. In a background-free environment, m{sub {chi}}{approx}50 GeV could in principle be determined with an error of {approx}35% with only 2 Multiplication-Sign 50 events; in practice, upper and lower limits on the recoil energy of signal events, imposed to reduce backgrounds, can increase the error. The method also loses precision if m{sub {chi}} significantly exceeds the mass of the heaviest target nucleus used.
- OSTI ID:
- 22156649
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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