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Dark matter directionality revisited with a high pressure xenon gas detector

  • Gopolang Mohlabeng
  • Kyoungchul Kong
  • Jin Li
  • Adam Para
  • Jonghee YooEmail author
Open Access
Regular Article - Experimental Physics

Abstract

An observation of the anisotropy of dark matter interactions in a direction-sensitive detector would provide decisive evidence for the discovery of galactic dark matter. Directional information would also provide a crucial input to understanding its distribution in the local Universe. Most of the existing directional dark matter detectors utilize particle tracking methods in a low-pressure gas time projection chamber. These low pressure detectors require excessively large volumes in order to be competitive in the search for physics beyond the current limit. In order to avoid these volume limitations, we consider a novel proposal, which exploits a columnar recombination effect in a high-pressure gas time projection chamber. The ratio of scintillation to ionization signals observed in the detector carries the angular information of the particle interactions.

In this paper, we investigate the sensitivity of a future directional detector focused on the proposed high-pressure Xenon gas time projection chamber. We study the prospect of detecting an anisotropy in the dark matter velocity distribution. We find that tens of events are needed to exclude an isotropic distribution of dark matter interactions at 95% confidence level in the most optimistic case with head-to-tail information. However, one needs at least 10-20 times more events without head-to-tail information for light dark matter below ∼50 GeV. For an intermediate mass range, we find it challenging to observe an anisotropy of the dark matter distribution. Our results also show that the directional information significantly improves precision measurements of dark matter mass and the elastic scattering cross section for a heavy dark matter.

Keywords

Dark Matter and Double Beta Decay 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Gopolang Mohlabeng
    • 1
  • Kyoungchul Kong
    • 1
  • Jin Li
    • 2
  • Adam Para
    • 3
  • Jonghee Yoo
    • 3
    Email author
  1. 1.Department of Physics and AstronomyUniversity of KansasLawrenceUnited States
  2. 2.Center for Underground Physics, Institute for Basic Science (IBS)DaejonSouth Korea
  3. 3.Fermi National Accelerator LaboratoryBataviaUnited States

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