Speaker
Description
The Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) is one of the most sensitive experiments when it comes to the direct detection of light dark matter via nuclear recoils.
At low recoil energies below 100eV, the sensitivity is currently affected by the presence of a sharply increasing event rate below a few hundred eV for which dark matter as an origin has already been ruled out. This low energy excess (LEE) is not only observed in all CRESST detectors but other experiments encounter similar issues, making these observations relevant for the whole field, without a clear idea about its origin so far.
We will present the progress we made toward a model of the LEE that works for all CRESST detectors while using as few parameters as possible. We use two-dimensional unbinned likelihood fits for fitting time and energy simultaneously.
The studies cover our most recent data-taking run, including cycles where the cryostat was warmed up and cooled down several times to investigate temporary rises in the low energy event rate that have been observed to occur after such warm-ups.
| Submitted on behalf of a Collaboration? | Yes |
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