Search for MeV electron recoils from dark matter in EXO-200

Le résumé fourni par la source

We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of $6.8\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{cts}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}$ above 4 MeV and find no statistically significant excess over our background projection. Using a total $^{136}\mathrm{Xe}$ exposure of 234.1 kg yr, we exclude new parameter space for the charged-current absorption cross section for dark matter masses between ${m}_{\ensuremath{\chi}}=2.6--11.6\text{ }\text{ }\mathrm{MeV}$ with a minimum of $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}51}\text{ }{\mathrm{cm}}^{2}$ at 8.3 MeV at the 90% confidence level.

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