Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 108: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 3

T 108.3: Talk

Tuesday, February 28, 2012, 17:20–17:35, ZHG 102

Blind CRESST Data Analysis in the light of Time-Dependent Noise — •Florian Reindl — Max-Planck-Institut für Physik, D-80805 München, Germany

The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment directly searches for WIMP Dark Matter (Weakly Interacting Massive Particles). CRESST aims to detect the WIMPs via their elastic scattering off nuclei. Scintillating CaWO₄ crystals, operated at mK temperatures, are used as target material. A nuclear recoil mainly excites phonons in the target crystal. Furthermore, a small fraction of the deposited energy is converted into scintillation light. Therefore, each target crystal is paired with a light absorber. The warming-up of the crystal and the light absorber are measured with separate superconducting thermometers. The resulting thermal pulse is used to determine the energy of the corresponding particle interaction by reconstructing the amplitude of the pulse. This reconstruction is done by performing a fit with a so-called standard pulse. A cut on the root mean square (RMS) of this fit, which is a measure of the deviation of the standard pulse and the pulse induced by the interacting particle, is needed to reject pulses which do not guarantee a correct determination of the amplitude and thereby the energy. However, the RMS is energy-dependent and is sensitive to time-dependent noise. This contribution will present a newly developed method to automatically handle both dependencies and thus allowing to perform a completely blind raw data analysis.