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Title: Analysis strategies for general spin-independent WIMP-nucleus scattering

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Related Information: CHORUS Timestamp: 2016-09-08 18:10:33; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Hoferichter, Martin, Klos, Philipp, Menéndez, Javier, and Schwenk, Achim. Analysis strategies for general spin-independent WIMP-nucleus scattering. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.063505.
Hoferichter, Martin, Klos, Philipp, Menéndez, Javier, & Schwenk, Achim. Analysis strategies for general spin-independent WIMP-nucleus scattering. United States. doi:10.1103/PhysRevD.94.063505.
Hoferichter, Martin, Klos, Philipp, Menéndez, Javier, and Schwenk, Achim. Thu . "Analysis strategies for general spin-independent WIMP-nucleus scattering". United States. doi:10.1103/PhysRevD.94.063505.
title = {Analysis strategies for general spin-independent WIMP-nucleus scattering},
author = {Hoferichter, Martin and Klos, Philipp and Menéndez, Javier and Schwenk, Achim},
abstractNote = {},
doi = {10.1103/PhysRevD.94.063505},
journal = {Physical Review D},
number = 6,
volume = 94,
place = {United States},
year = {Thu Sep 08 00:00:00 EDT 2016},
month = {Thu Sep 08 00:00:00 EDT 2016}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.94.063505

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Cited by: 12works
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  • We discuss the interpretation of the annual modulation signal seen in the DAMA experiment in terms of spin-independent elastic WIMP scattering. Taking into account channeling in the crystal as well as the spectral signature of the modulation signal we find that the low-mass WIMP region consistent with DAMA data is confined to WIMP masses close to m{sub {chi}} {approx_equal} 12 GeV, in disagreement with the constraints from CDMS and XENON. We conclude that even if channeling is taken into account this interpretation of the DAMA modulation signal is disfavoured. There are no overlap regions in the parameter space at 90%more » CL and a consistency test gives the probability of 1.2 Multiplication-Sign 10{sup -5}. We study the robustness of this result with respect to variations of the WIMP velocity distribution in our galaxy, by changing various parameters of the distribution function, and by using the results of a realistic N-body dark matter simulation. We find that only by making rather extreme assumptions regarding halo properties can we obtain agreement between DAMA and CDMS/XENON.« less
  • Cited by 31
  • An energy threshold of (220{+-}10) eV was achieved at an efficiency of 50% with a four-channel ultralow-energy germanium detector, each with an active mass of 5 g. This provides a unique probe to weakly interacting massive particles (WIMP) dark matter with mass below 10 GeV. With a data acquisition live time of 0.338 kg-day at the Kuo-Sheng Laboratory, constraints on WIMPs in the galactic halo were derived. The limits improve over previous results on both spin-independent WIMP-nucleon and spin-dependent WIMP-neutron cross-sections for WIMP mass between 3 and 6 GeV. Sensitivities for full-scale experiments are projected. This detector technique makes themore » unexplored sub-keV energy window accessible for new neutrino and dark matter experiments.« less
  • We report new results from the Cryogenic Dark Matter Search (CDMS II) at the Soudan Underground Laboratory. Two towers, each consisting of six detectors, were operated for 74.5 live days, giving spectrum-weighted exposures of 34 kg-d for germanium and 12 kg-d for silicon targets after cuts, averaged over recoil energies 10-100 keV for a WIMP mass of 60GeV/c{sup 2}. A blind analysis was conducted, incorporating improved techniques for rejecting surface events. No WIMP signal exceeding expected backgrounds was observed. When combined with our previous results from Soudan, the 90% C.L. upper limit on the spin-independent WIMP-nucleon cross section is 1.6more » x 10{sup -43} cm{sup 2} from Ge, and 3 x 10{sup -42} cm{sup 2} from Si, for a WIMP mass of 60GeV/c{sup 2}. The combined limit from Ge (Si) is a factor of 2.5 (10) lower than our previous results, and constrains predictions of supersymmetric models.« less
  • Spin-dependent weakly interacting massive particle (WIMP) searches have traditionally presented results within an odd group approximation and by suppressing one of the spin-dependent interaction cross sections. We here elaborate on a model-independent analysis in which spin-dependent interactions with both protons and neutrons are simultaneously considered. Within this approach, equivalent current limits on the WIMP-nucleon interaction at WIMP mass of 50 GeV/c{sup 2} are either {sigma}{sub p}{<=}0.7 pb, {sigma}{sub n}{<=}0.2 pb or vertical bar a{sub p} vertical bar {<=}0.4, vertical bar a{sub n} vertical bar {<=}0.7 depending on the choice of cross section or coupling strength representation. These limits become lessmore » restrictive for either larger or smaller masses; they are less restrictive than those from the traditional odd group approximation regardless of WIMP mass. Combinations of experimental results are seen to produce significantly more restrictive limits than those obtained from any single experiment. Experiments traditionally considered spin-independent are moreover found to severely limit the spin-dependent phase space. The extension of this analysis to the case of positive signal experiments is explored.« less