Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 6: Suche nach dunkler Materie I
T 6.2: Talk
Monday, March 19, 2018, 16:20–16:35, Philo-HS6
Modelling of electromagnetic backgrounds in the CRESST experiment — •Holger Kluck1,2 and Cenk Türkoğlu1,2 for the CRESST collaboration — 1Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften, 1050 Wien, Österreich — 2Atominstitut, Technische Universität Wien, 1020 Wien, Österreich
CRESST searches directly for dark matter (DM) with CaWO4 crystals operated as cryogenic calorimeters. It established leading limits for the spin-independent DM-nucleon scattering cross-section down to DM-particle masses of 350 MeV/c2. At this mass regime, the rejection power against electromagnetic background starts to degrade. The background in the region of interest is mainly caused by β and γ decays of radioactive contaminations in the CaWO4 crystals and their Cu surrounding. To gain a reliable understanding of these background components a detailed Geant4 model of the contaminations is under development.
In this contribution we report the current status of the benchmark simulation used to validate the model. We discuss the absolute normalization of the simulation via sideband measurements of α decays. Finally, we show preliminary results of a validation against experimental reference data.