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Physik-Institut Group of Laura Baudis

First XENON1T Results

We have analysed the data from a 34.2 live days run of the XENON1T experiment at LNGS, acquired between November 2016 and January 2017.

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).