Predicted modulated differential rates for direct WIMP searches at low energy transfers

Details Predicted modulated differential rates for direct WIMP searches at low energy transfers Predicted modulated differential rates for direct WIMP searches at low energy transfers

2011-08-24

arxiv.org/abs/1108.4768v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 22 figures; references added

Scientific paper

The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and low energy transfers. It is shown that for sufficiently light WIMPs the extraction of relatively large nucleon cross sections is possible. Furthermore for some WIMP masses the modulation amplitude may change sign, meaning that, in such a case, the maximum rate may occur six months later than naively expected. This effect can be exploited to yield information about the mass of the dark matter candidate, if and when the observation of the modulation of the event rate is established.

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