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First results from the XENON1T dark matter experiment at LNGS.
The XENON1T experiment, hosted in the Laboratori Nazionali del Gran Sasso (LNGS), is dedicated to the direct search of dark matter particles. It consists of a double-phase time projection chamber using ultra-pure liquid xenon. With an active target mass of 2 t, it's the largest TPC ever built and operated for dark matter search. Thanks to a careful selection of construction materials, a dedicated distillation of the xenon target, and an active muon veto system, the background level in the inner 1t fiducial region is about 2.e-4 dru, the lowest ever achieved in a direct dark matter experiment. We present here the results of the first XENON1T science run. We also discuss the plans for its future upgrade, XENONnT.