Search for low-mass dark matter with CDMSlite using a profile likelihood fit
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Abstract
The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) searches for interactions between dark matter particles and germanium nuclei in cryogenic detectors. The experiment has achieved a low energy threshold with improved sensitivity to low-mass ($<10\text{ }\text{ }\mathrm{GeV}/{c}^{2}$) dark matter particles. We present an analysis of the final CDMSlite dataset, taken with a different detector than was used for the two previous CDMSlite datasets. This analysis includes a data ``salting'' method to protect against bias, improved noise discrimination, background modeling, and the use of profile likelihood methods to search for a dark matter signal in the presence of backgrounds. We achieve an energy threshold of 70 eV and significantly improve the sensitivity for dark matter particles with masses between 2.5 and $10\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ compared to previous analyses. We set an upper limit on the dark matter-nucleon scattering cross section in germanium of $5.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}42}\text{ }\text{ }{\mathrm{cm}}^{2}$ at $5\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, a factor of $\ensuremath{\sim}2.5$ improvement over the previous CDMSlite result.
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