First Direct Detection Constraints on Planck-Scale Mass Dark Matter with Multiple-Scatter Signatures Using the DEAP-3600 Detector

Le résumé fourni par la source

Dark matter with Planck-scale mass ($\ensuremath{\simeq}{10}^{19}\text{ }\text{ }\mathrm{GeV}/{c}^{2}$) arises in well-motivated theories and could be produced by several cosmological mechanisms. A search for multiscatter signals from supermassive dark matter was performed with a blind analysis of data collected over a 813 d live time with DEAP-3600, a 3.3 t single-phase liquid argon-based detector at SNOLAB. No candidate signals were observed, leading to the first direct detection constraints on Planck-scale mass dark matter. Leading limits constrain dark matter masses between $8.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ and $1.2\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, and $^{40}\mathrm{Ar}$-scattering cross sections between $1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}23}$ and $2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}\text{ }\text{ }{\mathrm{cm}}^{2}$. These results are interpreted as constraints on composite dark matter models with two different nucleon-to-nuclear cross section scalings.

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