On Diurnal and Annual Variations of Directional Detection Rates of Dark Matter

Abstract

Direction sensitive direct detection of Weakly Interacting Massive Particles (WIMPs) as dark matter would provide an unambiguous non-gravitational signature of dark matter (DM). The diurnal variation of DM signal due to earth's rotation around its own axis can be a significant signature for galactic WIMPs. Because of particular orientation of earth's axis of rotation with respect to WIMP wind direction, the apparent direction of WIMP wind as observed at a detector can alter widely over a day. In this work we calculate the directional detection rates with their daily and yearly modulations in earth-bound dark matter experiments considering detailed features of the geometry and dynamics of the earth-sun system along with the solar motion in galactic frame. A separate halo model namely the dark disc model other than the usual standard halo model for dark matter halo is also considered and the results for two models are compared. We demonstrate the results for two types of gas detectors namely DRIFT (target material CS2) and NEWAGE (target material CF4) that use Time Projection Chamber techniques for measuring directionality of the recoil nucleus. The WIMP mass and recoil energy dependence of the daily variation of event rates are computed for specific detector and the sensitive ranges of mass and recoil energies for the considered detector are probed.

11 pages, 17 figures

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Cited by in corpus (12)

• Constraints on bosonic dark matter from ultralow-field nuclear magnetic resonance
• Directional detection of dark matter in universal bound states
• Diurnal Effect of Sub-GeV Dark Matter Boosted by Cosmic Rays
• Directional dark matter by polar angle direct detection and application of columnar recombination
• Simulations of the 3-Dimensional Velocity Distribution of Halo Weakly Interacting Massive Particles for Directional Dark Matter Detection Experiments
• Nuclear decay anomalies as a signature of axion dark matter
• Simulations of the Angular Recoil-Energy Distribution of WIMP-Scattered Target Nuclei for Directional Dark Matter Detection Experiments
• Monte Carlo Scattering-by-Scattering Simulation of 3-Dimensional Elastic WIMP-Nucleus Scattering Events
• The dark Stodolsky effect: constraining effective dark matter operators with spin-dependent interactions
• 3-Dimensional Effective Velocity Distribution of Halo Weakly Interacting Massive Particles Scattering off Nuclei in Direct Dark Matter Detectors
• Gravitational Focusing of Low-Velocity Dark Matter on the Earth's Surface
• Some Thoughts on (the Incompleteness of) the (Double) Differential Event Rates for Elastic WIMP-Nucleus Scattering in (Directional) Direct Dark Matter Detection Physics