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Comparing readout strategies to directly detect dark matter

J. Billard

  • IPNL, Université de Lyon, Université Lyon 1, CNRS/IN2P3, 4 rue E. Fermi 69622 Villeurbanne cedex, France

  • j.billard@ipnl.in2p3.fr
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Phys. Rev. D 91, 023513 – Published 21 January, 2015

DOI: https://doi.org/10.1103/PhysRevD.91.023513

Abstract

Over the past decades, several ideas and technologies have been developed to directly detect weakly interacting massive particles (WIMP) from the galactic halo. All these detection strategies share the common goal of discriminating a WIMP signal from the residual backgrounds. By directly detecting WIMPs, one can measure some or all of the observables associated to each nuclear recoil candidates, such as their energy and direction. In this study, we compare and examine the discovery potentials of each readout strategies from counting only (bubble chambers) to directional detectors (Time Projection Chambers) with 1d-, 2d-, and 3d-sensitivity. Using a profile likelihood analysis, we show that, in the case of a large and irreducible background contamination characterized by an energy distribution similar to the expected WIMP signal, directional information can improve the sensitivity of the experiment by several orders of magnitude. We also found that 1d directional detection is only less effective than a full 3d directional sensitivity by about a factor of 3, or 10 if we assume no sense recognition, still improving by a factor of 2 or more if only the energy of the events is being measured.

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Synopsis

How to Spot a WIMP

Published 21 January, 2015

A theoretical study outlines the best strategies for identifying weakly interacting massive particles (WIMPs) in dark matter detectors.

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Article Text

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Phys. Rev. D 91, 023513– Published 21 January, 2015
  • Received 21 November 2014

© 2015 American Physical Society

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