Low energy electron/recoil discrimination for directional Dark Matter detection
arXiv:1205.0973 · doi:10.1088/1475-7516/2012/07/020
Abstract
Directional detection is a promising Dark Matter search strategy. Even though it could accommodate to a sizeable background contamination, electron/recoil discrimination remains a key and challenging issue as for direction-insensitive detectors. The measurement of the 3D track may be used to discriminate electrons from nuclear recoils. While a high rejection power is expected above 20 keV ionization, a dedicated data analysis is needed at low energy. After identifying discriminant observables, a multivariate analysis, namely a Boosted Decision Tree, is proposed, enabling an efficient event tagging for Dark Matter search. We show that it allows us to optimize rejection while keeping a rather high efficiency which is compulsory for rare event search.With respect to a sequential analysis, the rejection is about 20 times higher with a multivariate analysis, for the same Dark Matter exclusion limit.
20 pages, 20 figures
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Cited by in corpus (11)
- A review of the discovery reach of directional Dark Matter detection
- Readout technologies for directional WIMP Dark Matter detection
- Gaseous and dual-phase time projection chambers for imaging rare processes
- TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection
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- TREX-DM: a low background Micromegas-based TPC for low-mass WIMP detection