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Dark counts in optical superconducting transition-edge sensors for rare-event searches (2402.03073v4)

Published 5 Feb 2024 in physics.ins-det, cond-mat.supr-con, and hep-ex

Abstract: Superconducting transition-edge sensors (TESs) are a type of quantum sensor known for its high single-photon detection efficiency and low background. This makes them ideal for particle physics experiments searching for rare events. In this work, we present a comprehensive characterization of the background in optical TESs, distinguishing three types of events: electrical-noise, high-energy, and photonlike events. We introduce computational methods to automate the classification of events. For the first time, we experimentally verify and simulate the source of the high-energy events. We also isolate the photonlike events, the expected signal in dielectric haloscopes searching for dark matter dark photons, and achieve a record-low photonlike dark-count rate of $3.6 \times 10{-4}$ Hz in the 0.8-3.2 eV energy range.

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