30.10.2017First XENON1T Results

A profile likelihood analysis showed that the data inside a 1042 kg fiducial mass and an energy region 5-40 keV for nuclear recoils is consistent with the background-only hypothesis. It allowed us to set he most stringent exclusion limits on the spin-independent WIMP-nucleon interaction cross section with a minimum of 7.7 x 10^-47 cm² for 35 GeV/c² WIMPs at 90% C.L. The results, published in Phys. Rev. Lett. 119, 181301 (2017), also yielded the lowest electronic recoil background ever achieved in a dark matter experiment, of about 2 x 10^-4 events/(kg day keV).