Improved Spin Dependent Limits from the PICASSO Dark Matter Search Experiment
The PICASSO Collaboration: M. Barnabe-Heider, E. Behnke, K. Clark, M., Di Marco, P. Doane, W. Feighery, M.-H. Genest, R. Gornea, R. Guenette, S., Kanagalingam, C. B. Krauss, C. Leroy, L. Lessard, I. Levine, J.-P. Martin, C., Muthusi, A. J. Noble, R. Noulty, U. Wichoski, V. Zacek
TL;DR
The PICASSO experiment set new limits on spin-dependent WIMP interactions using superheated droplet detectors, excluding some parameter space for WIMPs below 20 GeV/c2, with no WIMP signal detected.
Contribution
This work provides improved spin-dependent WIMP interaction limits using a novel superheated droplet detection method at a deep underground site.
Findings
No evidence for WIMP signals was observed.
New exclusion limits for WIMP-proton and WIMP-neutron cross sections.
Some parameter space below 20 GeV/c2 is now ruled out.
Abstract
The PICASSO experiment reports an improved limit for the existence of cold dark matter WIMPs interacting via spin-dependent interactions with nuclei. The experiment is installed in the Sudbury Neutrino Observatory at a depth of 2070 m. With superheated C4F10 droplets as the active material, and an exposure of 1.98+-0.19 kgd, no evidence for a WIMP signal was found. For a WIMP mass of 29 GeV/c2, limits on the spin-dependent cross section on protons of sigma_p = 1.31 pb and on neutrons of sigma_n = 21.5 pb have been obtained at 90% C.L. In both cases, some new parameter space in the region of WIMP masses below 20 GeV/c2 has now been ruled out. The results of these measurements are also presented in terms of limits on the effective WIMP-proton and neutron coupling strengths a_p and a_n.
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