Integrating In Dark Matter Astrophysics at Direct Detection Experiments

Abstract

We study the capabilities of the MAJORANA DEMONSTRATOR, a neutrinoless double-beta decay experiment currently under construction at the Sanford Underground Laboratory, as a light WIMP detector. For a cross section near the current experimental bound, the MAJORANA DEMONSTRATOR should collect hundreds or even thousands of recoil events. This opens up the possibility of simultaneously determining the physical properties of the dark matter and its local velocity distribution, directly from the data. We analyze this possibility and find that allowing the dark matter velocity distribution to float considerably worsens the WIMP mass determination. This result is traced to a previously unexplored degeneracy between the WIMP mass and the velocity dispersion. We simulate spectra using both isothermal and Via Lactea II velocity distributions and comment on the possible impact of streams. We conclude that knowledge of the dark matter velocity distribution will greatly facilitate the mass and cross section determination for a light WIMP.

11 pages, 5 figures; updated to synchronize with the Phys Lett B version

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• Complementarity of dark matter direct detection: the role of bolometric targets
• Mapping The Neutrino Floor For Dark Matter-Electron Direct Detection Experiments
• Detecting Asymmetric Dark Matter in the Sun with Neutrinos
• Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module
• LUX Constraints on Magnetic Dark Matter in the $S\bar{E}\chi$y Model with(out) Naturality
• Impact of uncertainties in the halo velocity profile on direct detection of sub-GeV dark matter
• Bayesian analysis of multiple direct detection experiments