Detector signal characterization with a Bayesian network in XENONnT

XENON Collaboration

Research output: Contribution to journalArticlepeer-review


We developed a detector signal characterization model based on a Bayesian network trained on the waveform attributes generated by a dual-phase xenon time projection chamber. By performing inference on the model, we produced a quantitative metric of signal characterization and demonstrate that this metric can be used to determine whether a detector signal is sourced from a scintillation or an ionization process. We describe the method and its performance on electronic-recoil (ER) data taken during the first science run of the XENONnT dark matter experiment. We demonstrate the first use of a Bayesian network in a waveform-based analysis of detector signals. This method resulted in a 3% increase in ER event-selection efficiency with a simultaneously effective rejection of events outside of the region of interest. The findings of this analysis are consistent with the previous analysis from XENONnT, namely a background-only fit of the ER data.

Original languageEnglish (US)
Article number012016
JournalPhysical Review D
Issue number1
StatePublished - Jul 1 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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