%0 Journal Article
%T Low energy electron/recoil discrimination for directional Dark Matter detection
%A J. Billard
%A F. Mayet
%A D. Santos
%J Physics
%D 2012
%I arXiv
%R 10.1088/1475-7516/2012/07/020
%X 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.
%U http://arxiv.org/abs/1205.0973v2