Theoretical Rates for Direct Detection of Supersymmetric Dark Matter

Details Theoretical Rates for Direct Detection of Supersymmetric Dark Matter Theoretical Rates for Direct Detection of Supersymmetric Dark Matter

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.o7014v&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Exotic cold dark matter (CDM) seems to dominate the Universe. Thus the direct detection of CDM is central to particle physics and cosmology. Current supersymmetric models provide a natural dark matter candidate which is the lightest supersymmetric particle (LSP). Such models combined with the quark substructure of the nucleon and nuclear form factor and/or spin response function, yield the event rate for LSP-nucleus elastic scattering. The nucleon cross-section was obtained in the minimal supersymmetric standard model with universal boundary conditions. Since the event rates are very low, one should exploit the two experimental signatures, i.e. a) the modulation effect, (the dependence of the event rate on the Earth's motion) and b) its dependence on the direction of the recoiling nucleus. We calculate such effects using various velocity distributions, i.e. isothermal (symmetric as well as only axially asymmetric) and non isothermal (caustic rings). We find large correlation with the direction of the Sun's motion. The modulation is small in the symmetric velocity distribution and in the case of caustic rings. The inclusion of asymmetry yields an enhanced modulation effect, especially in directional experiments.

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