Kavli Affiliate: Paul Brink
| Summary:
We present limits on spin-independent dark matter-nucleon interactions using a $10.6$ $mathrmg$ Si athermal phonon detector with a baseline energy resolution of $σ_E=3.86 pm 0.04$ $(mathrmstat.)^+0.19_-0.00$ $(mathrmsyst.)$ $mathrmeV$. This exclusion analysis sets the most stringent dark matter-nucleon scattering cross-section limits achieved by a cryogenic detector for dark matter particle masses from $93$ to $140$ $mathrmMeV/c^2$, with a raw exposure of $9.9$ $mathrmgcdotmathrmd$ acquired at an above-ground facility. This work illustrates the scientific potential of detectors with athermal phonon sensors with eV-scale energy resolution for future dark matter searches.
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