Signal Response Model in PandaX-4T

PandaX-4T experiment is a deep-underground dark matter direct searchexperiment that employs a dual-phase time projection chamber with a sensitivevolume containing 3.7 tonne of liquid xenon. The detector of PandaX-4T iscapable of simultaneously collecting the primary scintillation and ionizationsignals, utilizing their ratio to discriminate dark matter signals frombackground sources such as gamma rays and beta particles. The signal responsemodel plays a crucial role in interpreting the data obtained by PandaX-4T. Itdescribes the conversion from the deposited energy by dark matter interactionsto the detectable signals within the detector. The signal response model isutilized in various PandaX-4T results. This work provides a comprehensivedescription of the procedures involved in constructing and parameter-fittingthe signal response model for the energy range of approximately 1 keV to 25 keVfor electronic recoils and 6 keV to 90 keV for nuclear recoils. It also coversthe signal reconstruction, selection, and correction methods, which are crucialcomponents integrated into the signal response model.