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Update of the direct detection of dark matter and the role of the nuclear spin

V. A. Bednyakov·H. V. Klapdor-Kleingrothaus
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Abstract

We update our exploration of the MSSM parameter space at the weak scale where new accelerator and cosmological constraints are respected. The dependence of WIMP-nucleon cross sections on parameters of the MSSM, uncertainties of the nucleon structure and other theoretical assumptions like universality and co-annihilation are considered. In particular, we find that the coannihilation does not have a significant effect in our analysis in certain regions which are allowed even with coannihilation. The new cosmological constraint on the relic neutralino density used in the form $0.1 < Ω_χh^2_0<0.3$ does also not significantly affect the regions of allowed neutralino-nucleon cross sections. We notice that for nuclear targets with spin the spin-dependent interaction may determine the lower bound for the direct detection rate when the cross section of the scalar interaction drops below about $10^{-12} $pb.

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V. A. Bednyakov, H. V. Klapdor-Kleingrothaus. 2000-11-19. Update of the direct detection of dark matter and the role of the nuclear spin. https://doi.org/10.1103/physrevd.63.095005

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