Determining Ratios of WIMP-Nucleon Cross Sections from Direct Dark Matter Detection Data

Abstract

Weakly Interacting Massive Particles (WIMPs) are one of the leading candidates for Dark Matter. So far the usual procedure for constraining the WIMP-nucleon cross sections in direct Dark Matter detection experiments have been to fit the predicted event rate based on some model(s) of the Galactic halo and of WIMPs to experimental data. One has to assume whether the spin-independent (SI) or the spin-dependent (SD) WIMP-nucleus interaction dominates, and results of such data analyses are also expressed as functions of the as yet unknown WIMP mass. In this article, I introduce methods for extracting information on the WIMP-nucleon cross sections by considering a general combination of the SI and SD interactions. Neither prior knowledge about the local density and the velocity distribution of halo WIMPs nor about their mass is needed. Assuming that an exponential-like shape of the recoil spectrum is confirmed from experimental data, the required information are only the measured recoil energies (in low energy ranges) and the number of events in the first energy bin from two or more experiments.

33 pages, 20 eps figures; v2: typos fixed, references added and updated, revised version for publication

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• Origins of the Isospin Violation of Dark Matter Interactions
• What can(not) be measured with ton-scale dark matter direct detection experiments
• The Scientific Reach of Multi-Ton Scale Dark Matter Direct Detection Experiments
• On the formalism and upper limits for spin-dependent cross sections in dark matter elastic scattering with nuclei
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• Estimating the Spin-Independent WIMP-Nucleon Coupling from Direct Dark Matter Detection Data
• Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Determinations of Ratios of WIMP-Nucleon Cross Sections
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