Readout strategies for directional dark matter detection beyond the neutrino background

Abstract : The search for weakly interacting massive particles (WIMPs) by direct detection faces an encroaching background due to coherent neutrino-nucleus scattering. As the sensitivity of these experiments improves, the question of how to best distinguish a dark matter signal from neutrinos will become increasingly important. A proposed method of overcoming this so-called 'neutrino floor' is to utilize the directional signature that both neutrino and dark matter induced recoils possess. We show that directional experiments can indeed probe WIMP-nucleon cross-sections below the neutrino floor with little loss in sensitivity due to the neutrino background. In particular we find at low WIMP masses (around 6 GeV) the discovery limits for directional detectors penetrate below the non-directional limit by several orders of magnitude. For high WIMP masses (around 100 GeV), the non-directional limit is overcome by a factor of a few. Furthermore we show that even for directional detectors which can only measure 1- or 2-dimensional projections of the 3-dimensional recoil track, the discovery potential is only reduced by a factor of 3 at most. We also demonstrate that while the experimental limitations of directional detectors, such as sense recognition and finite angular resolution, have a detrimental effect on the discovery limits, it is still possible to overcome the ultimate neutrino background faced by non-directional detectors.
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Physical Review D, American Physical Society, 2015, 92, pp.063518. 〈10.1103/PhysRevD.92.063518〉
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Soumis le : mercredi 1 juillet 2015 - 15:17:11
Dernière modification le : jeudi 15 mars 2018 - 11:40:10

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C.A.J. O'Hare, A.-M. Green, J. Billard, E. Figueroa-Feliciano, L.-E. Strigari. Readout strategies for directional dark matter detection beyond the neutrino background. Physical Review D, American Physical Society, 2015, 92, pp.063518. 〈10.1103/PhysRevD.92.063518〉. 〈in2p3-01170426〉

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