# Geant4-based electromagnetic background model for the CRESST dark matter experiment

## TL;DR

This paper presents a Geant4-based simulation model that effectively explains a significant portion of the electromagnetic background in the CRESST dark matter experiment, aiding in background understanding and reduction.

## Contribution

The study develops a detailed Monte Carlo simulation model of electromagnetic backgrounds specific to CRESST, improving background estimation accuracy.

## Key findings

- Explains up to 68% of electromagnetic background in 1-40 keV range.
- Uses Geant4 simulations tailored to CRESST detector materials.
- Provides insights for background mitigation in dark matter searches.

## Abstract

The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) dark matter search experiment aims for the detection of dark matter particles via elastic scattering off nuclei in $\mathrm{CaWO_4}$ crystals. To understand the CRESST electromagnetic background due to the bulk contamination in the employed materials, a model based on Monte Carlo simulations was developed using the Geant4 simulation toolkit. The results of the simulation are applied to the TUM40 detector module of CRESST-II phase 2. We are able to explain up to $(68 \pm 16)\,\mathrm{\%}$ of the electromagnetic background in the energy range between $1\,\mathrm{keV}$ and $40\,\mathrm{keV}$.