Bradley J. Kavanagh, Anne M. Green
Determining the dark matter (DM) mass is of paramount importance for understanding dark matter. We present a novel parametrization of the DM speed distribution which will allow the DM mass to be accurately measured using data from Weakly Interacting Massive Particle (WIMP) direct detection experiments. Specifically, we parametrize the natural logarithm of the speed distribution as a polynomial in the speed v. We demonstrate, using mock data from upcoming experiments, that by fitting the WIMP mass and interaction cross-section, along with the polynomial coefficients, we can accurately reconstruct both the WIMP mass and speed distribution. This new parameterization represents a significant improvement over previous methods as it provides an accurate, unbiased reconstruction of the WIMP mass even for non-trivial underlying speed distributions, demonstrating that the WIMP properties can be reconstructed from direct detection experiments without prior knowledge of the distribution function.
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http://arxiv.org/abs/1303.6868
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