Located at the LNGS, Italy, DarkSide (DS) is a dark matter search project, which features a dual-phase Time Projection Chamber as the WIMP detector, surrounded by an organic liquid-scintillator neutron veto and a water-Cherenkov muon veto. The current DS-50 has been taking data since 2013, initially with atmospheric Ar (AAr) and then, starting in April 2015, with Ar extracted from underground sources (UAr). Since August 2015, DS-50 have accumulated 540+ live-days of blinded data with the UAr target as of November 2017, and we expect to publish the blind analysis in the month of February 2018. Xin Xiang will discuss the background studies in the blind analysis scheme with an emphasis on a novel concept of Cherenkov coincidence background. The Monte Carlo modeling and the background predictions will be presented.
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