# First dark matter search results from the XENON1T experiment

XENON Collaboration; Baudis, Laura; Brown, Adam; Galloway, Michelle; Kazama, Shingo; Kish, Alexander; Piastra, Francesco; Reichard, Shayne; Wulf, Julien; et al (2017). First dark matter search results from the XENON1T experiment. Physical Review Letters, 119(18):181301.

## Abstract

We report the first dark matter search results from XENON1T, a ∼2000−kg-target-mass dual-phase (liquid-gas) xenon time projection chamber in operation at the Laboratori Nazionali del Gran Sasso in Italy and the first ton-scale detector of this kind. The blinded search used 34.2 live days of data acquired between November 2016 and January 2017. Inside the (1042±12)−kg fiducial mass and in the [5,40]  $keV_{nr}$ energy range of interest for weakly interacting massive particle (WIMP) dark matter searches, the electronic recoil background was $(1.93±0.25)×10^{−4}$  events/($kg×day×keV_{ee}$), the lowest ever achieved in such a dark matter detector. A profile likelihood analysis shows that the data are consistent with the background-only hypothesis. We derive the most stringent exclusion limits on the spin-independent WIMP-nucleon interaction cross section for WIMP masses above 10  GeV/$c^2$, with a minimum of $7.7×10{−47} cm^2 for 35−GeV/c^2$ WIMPs at 90% C.L.

## Abstract

We report the first dark matter search results from XENON1T, a ∼2000−kg-target-mass dual-phase (liquid-gas) xenon time projection chamber in operation at the Laboratori Nazionali del Gran Sasso in Italy and the first ton-scale detector of this kind. The blinded search used 34.2 live days of data acquired between November 2016 and January 2017. Inside the (1042±12)−kg fiducial mass and in the [5,40]  $keV_{nr}$ energy range of interest for weakly interacting massive particle (WIMP) dark matter searches, the electronic recoil background was $(1.93±0.25)×10^{−4}$  events/($kg×day×keV_{ee}$), the lowest ever achieved in such a dark matter detector. A profile likelihood analysis shows that the data are consistent with the background-only hypothesis. We derive the most stringent exclusion limits on the spin-independent WIMP-nucleon interaction cross section for WIMP masses above 10  GeV/$c^2$, with a minimum of $7.7×10{−47} cm^2 for 35−GeV/c^2$ WIMPs at 90% C.L.

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