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 greater than or similar to 20 GeV by the null result with the DAMA Xe detector. A SD WIMP with mass less than or similar to 20 GeV is still compatible, but only if the SD WIMP-neutron interaction is four orders of magnitude greater than the WIMP-proton interaction.
|Titolo:||Spin-Dependent WIMPs in DAMA?|
|Autori:||ULLIO P; M. KAMIONKOWSKI; P. VOGEL|
|Rivista:||JOURNAL OF HIGH ENERGY PHYSICS|
|Data di pubblicazione:||2001|
|Digital Object Identifier (DOI):||10.1088/1126-6708/2001/07/044|
|Appare nelle tipologie:||1.1 Journal article|