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Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 62: Search for Dark Matter III

T 62.3: Vortrag

Mittwoch, 2. April 2025, 16:45–17:00, VG 4.102

Novel Peak(let) Classification for the XENONnT Experiment — •Johannes Merz for the XENON collaboration — Johannes Gutenberg-Universität Mainz, Institut für Physik & Exzellenzcluster PRISMA+

The XENONnT Experiment is a dual phase time projection chamber searching for nuclear recoil signals generated by WIMP dark matter. Interactions with the liquid xenon in the bulk of the detector result in a prompt light signal (S1) and a secondary scintillation signal (S2), due to ionization electrons drifted in a moderate electric field to the liquid surface, where they are extracted to the gas phase in a strong field between two wire electrodes, called gate and anode.

These electrons lead to proportional scintillation in the gas phase and hence to an amplified S2 signal. XENONnT features a substantial background rate of single electrons, largely due to photoionization of neutral impurities, leading to numerous small S2 signals. These can be confused with S1 signals of similar size.

This presentation will show new machine learning classification methods used in XENONnT which will help to improve the discrimination between the two signal types and identify interesting signal populations in our data.

Keywords: direct dark matter detection; dual-phase xenon TPC; Machine Learning Methods

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