Spin dependent WIMPs in DAMA? - INSPIRE

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Spin dependent WIMPs in DAMA?

Oct, 2000

4 pages

Published in:

JHEP 07 (2001) 044

e-Print:

hep-ph/0010036 [hep-ph]

DOI:

10.1088/1126-6708/2001/07/044

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Abstract:

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.

WIMP: mass
coupling: axial-vector
spin dependence
coupling: (nucleus sparticle)
scattering: WIMP p
scattering: WIMP n
total cross section
WIMP: annihilation
neutrino: production
cosmic radiation: time dependence

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