Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 36: Search for Dark Matter II

T 36.8: Vortrag

Dienstag, 17. März 2026, 18:00–18:15, AM 00.014

Aboveground Studies of the Low-Energy Excess in CRESST — •Eleonora Rebecca Cipelli for the CRESST collaboration — Max Planck Institut für Physik, Garching bei München, Deutschland

The CRESST experiment, located at the Laboratori Nazionali del Gran Sasso (LNGS), is a leading direct dark matter detection experiment. It employs cryogenic calorimeters operated at millikelvin temperatures and instrumented with Transition Edge Sensors (TESs), achieving extremely low energy thresholds (~10 eV) and high sensitivity to sub-GeV dark matter particles. However, the experiment's sensitivity is currently limited by an unexplained increase in background events below ~200 eV, known as the Low-Energy Excess (LEE).

This talk will present new investigations into possible origins of the LEE based on dedicated above-ground R&D studies. In particular, it will focus on the impact of thermal cycles on the LEE decay, as well as the influence of aluminium phonon collectors. These studies provide new insights into the nature and mechanisms of the LEE.

Keywords: Low Energy Excess; Cryogenics; Dark Matter; CRESST; Transition Edge Sensors