Signal Response Model in PandaX-4T

Abstract

PandaX-4T experiment is a deep-underground dark matter direct search experiment that employs a dual-phase time projection chamber with a sensitive volume containing 3.7 tonne of liquid xenon. The detector of PandaX-4T is capable of simultaneously collecting the primary scintillation and ionization signals, utilizing their ratio to discriminate dark matter signals from background sources such as gamma rays and beta particles. The signal response model plays a crucial role in interpreting the data obtained by PandaX-4T. It describes the conversion from the deposited energy by dark matter interactions to the detectable signals within the detector. The signal response model is utilized in various PandaX-4T results. This work provides a comprehensive description of the procedures involved in constructing and parameter-fitting the signal response model for the energy range of approximately 1 keV to 25 keV for electronic recoils and 6 keV to 90 keV for nuclear recoils. It also covers the signal reconstruction, selection, and correction methods, which are crucial components integrated into the signal response model.

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• Search for Light Dark Matter with 259-day data in PandaX-4T
• Searching for Neutrinoless Double-Beta Decay of ${}^{136}$Xe with PandaX-4T
• Probing light mediators with recent PandaX-4T low energy electron recoil data
• Constraining neutrino electromagnetic properties with recent low-energy electron recoil data at dark matter direct detection experiments
• Search for Solar Boosted Dark Matter Particles at the PandaX-4T Experiment
• Data reduction strategy in the PandaX-4T experiment
• Precise ${}^{136}$Xe Double Beta Decay Measurement in PandaX-4T with Implications on the Nuclear Matrix Elements and Majorons
• Position reconstruction and surface background model for the PandaX-4T detector
• State of the Art in Direct Dark Matter Detectors: Technologies, Performance, and Future Directions