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. We employ a bias-mitigation
technique of hiding approximately 46% of our total data and aggressively mask
images to remove backgrounds. Given a total exposure after masking of 100.72
gram-days from well-performing sensors, 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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