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arXiv · 1905.05189

Direct Detection Anomalies in light of $Gaia$ Data

Matthew R. Buckley·Gopolang Mohlabeng·Christopher W. Murphy
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Abstract

Measurements from the Gaia satellite have greatly increased our knowledge of the dark matter velocity distributions in the Solar neighborhood. There is evidence for multiple cold structures nearby, including a high-velocity stream counterrotating relative to the Sun. This stream could significantly alter the spectrum of recoil energies and increase the annual modulation of dark matter in direct detection experiments such as DAMA/Libra. We reanalyze the experimental limits from Xenon1T, CDMSlite, PICO-60 and COSINE-100, and compare them to the results of the DAMA/Libra experiment. While we find that this new component of the dark matter velocity distribution can greatly improve the fit to the DAMA/Libra data, both spin-independent and spin-dependent interpretations of the DAMA/Libra signal with elastic and inelastic scattering continue to be ruled out by the null results of other experiments, in particular Xenon1T.

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Matthew R. Buckley, Gopolang Mohlabeng, Christopher W. Murphy. 2019-10-02. Direct Detection Anomalies in light of $Gaia$ Data. https://doi.org/10.1103/physrevd.100.055039

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