Marco Selvi (INFN Bologna)
We report on a search for Weakly Interacting Massive Particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS.
XENON1T utilizes a liquid xenon time projection chamber with a fiducial mass of 1.3 t, resulting in a 1.0 t yr exposure.
The energy region of interest, [1.4, 10.6] keVee ([4.9, 40.9] keVnr), exhibits an ultra-low electron recoil background rate of (82 +5/-3 (sys) +/- 3 (stat)) events/(t yr keVee).
No significant excess over background is found and a profile likelihood analysis parameterized in spatial and energy dimensions excludes new parameter space for the WIMP-nucleon spin-independent elastic scatter cross-section for WIMP masses above 6 GeV/c2, with a minimum of 4.1 10^{-47} cm2 at 30 GeV/c2 and 90% confidence level.