Kavli Affiliate: Michael Crisler
| First 5 Authors: SENSEI Collaboration, Prakruth Adari, Itay M. Bloch, Ana M. Botti, Mariano Cababie
| Summary:
We present the first results from a dark matter search using six Skipper-CCDs
in the SENSEI detector operating at SNOLAB. With an exposure of 534.9 gram-days
from well-performing sensors, we select events containing 2 to 10 electron-hole
pairs. After aggressively masking images to remove backgrounds, we observe 55
two-electron events, 4 three-electron events, and no events containing 4 to 10
electrons. The two-electron events are consistent with pileup from one-electron
events. Among the 4 three-electron events, 2 appear in pixels that are likely
impacted by detector defects, although not strongly enough to trigger our
"hot-pixel" mask. We use these data to set world-leading constraints on sub-GeV
dark matter interacting with electrons and nuclei.
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