Event Selection for Dark Matter Search of XENON1T

The XENON1T experiment is the most sensitive direct detection experiment for WIMP dark matter with masses above 6 $GeV/c^2$. We used a dual-phase xenon time-projection chamber containing 2 metric tons of liquid xenon. An exposure of one tonne-year of science data was collected between October 2016 and February 2018. This talk will present the event selection method used in data analysis of XENON1T that led to the most stringent limits on various WIMP models. I will discuss the reconstruction and selection of the events used by that analysis, and their respective efficiencies. The goal of these selections were to isolate single-scatter events in the energy range of interest. These selections depends upon a series of reconstruction and correction steps on the data. Our analysis starts with understanding photosensor stability and performance, followed by how we reconstruct scintillation and ionization signals, before ending with how properties of interactions are determined. I will discuss these steps while also explaining certain classes of backgrounds that we remove.