Spin-Dependent WIMPs in DAMA?

Details Spin-Dependent WIMPs in DAMA? Spin-Dependent WIMPs in DAMA?

2000-10-04

arxiv.org/abs/hep-ph/0010036v1

JHEP0107:044,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures

Scientific paper

10.1088/1126-6708/2001/07/044

We investigate whether the annual modulation observed in the DAMA experiment can be due to a weakly-interacting massive particle (WIMP) with an axial-vector (spin-dependent; SD) coupling to nuclei. We evaluate the SD WIMP-proton cross section under the assumption that such scattering accounts for the DAMA modulation, and we do the same for a SD WIMP-neutron cross section. We show that SD WIMP-proton scattering is ruled out in a model-independent fashion by null searches for energetic neutrinos from WIMP annihilation in the Sun, and that SD WIMP-neutron scattering is ruled out for WIMP masses > 20 GeV by the null result with the DAMA Xe detector. A SD WIMP with mass < 20 GeV is still compatible, but only if the SD WIMP-neutron interaction is four orders of magnitude greater than the WIMP-proton interaction.

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