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 (1.30±0.01)  ton, resulting in a 1.0 ton yr exposure. The energy region of interest, [1.4,10.6]  keVee ([4.9,40.9] keVnr), exhibits an ultralow electron recoil background rate of [82-3+5(syst)±3(stat)]  events/(ton yr keVee). No significant excess over background is found, and a profile likelihood analysis parametrized 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 a 90% confidence level.

pdf/dark-matter-search-results-from-a-one-ton-year-exposure-of-502yysjqo1.pdf

Dark Matter Search Results from a One Ton-Year Exposure of XENON1T.

We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. We mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of (22±3) tonne day. Above ∼0.4  keVee, we observe 30  MeV/c2, and absorption of dark photons and axionlike particles for mχ within 0.186–1  keV/c2.

/pdf/light-dark-matter-search-with-ionization-signals-in-xenon1t-1gx67mx5rx.pdf

Light Dark Matter Search with Ionization Signals in XENON1T.

LUX-ZEPLIN (LZ) is a next-generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA Using a two-phase xenon detector with an active mass of 7 tonnes, LZ will search primarily for low-energy interactions with weakly interacting massive particles (WIMPs), which are hypothesized to make up the dark matter in our galactic halo In this paper, the projected WIMP sensitivity of LZ is presented based on the latest background estimates and simulations of the detector For a 1000 live day run using a 56-tonne fiducial mass, LZ is projected to exclude at 90% confidence level spin-independent WIMP-nucleon cross sections above 14 × 10-48cm2 for a 40 GeV/c2 mass WIMP Additionally, a 5σ discovery potential is projected, reaching cross sections below the exclusion limits of recent experiments For spin-dependent WIMP-neutron(-proton) scattering, a sensitivity of 23 × 10−43 cm2 (71 × 10−42 cm2) for a 40 GeV/c2
 mass WIMP is expected With underground installation well underway, LZ is on track for commissioning at SURF in 2020

/pdf/projected-wimp-sensitivity-of-the-lux-zeplin-dark-matter-1cmcg8xbp5.pdf

Projected WIMP sensitivity of the LUX-ZEPLIN dark matter experiment

We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to constrain the spin-dependent proton-only and neutron-only cases. No significant signal excess is observed, and a profile likelihood ratio analysis is used to set exclusion limits on the WIMP-nucleon interactions. This includes the most stringent constraint to date on the WIMP-neutron cross section, with a minimum of 6.3×10-42  cm2 at 30  GeV/c2 and 90% confidence level. The results are compared with those from collider searches and used to exclude new parameter space in an isoscalar theory with an axial-vector mediator.

/pdf/constraining-the-spin-dependent-wimp-nucleon-cross-sections-15n0c9m9cg.pdf

Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T

XENONnT is a dark matter direct detection experiment, utilizing 5.9 t of instrumented liquid xenon, located at the INFN Laboratori Nazionali del Gran Sasso. In this work, we predict the experimental background and project the sensitivity of XENONnT to the detection of weakly interacting massive particles (WIMPs). The expected average differential background rate in the energy region of interest, corresponding to (1, 13) keV and (4, 50) keV for electronic and nuclear recoils, amounts to $12.3 \pm 0.6$ (keV t y)$^{-1}$ and $(2.2\pm 0.5)\times 10^{-3}$ (keV t y)$^{-1}$, respectively, in a 4 t fiducial mass. We compute unified confidence intervals using the profile construction method, in order to ensure proper coverage. With the exposure goal of 20 t$\,$y, the expected sensitivity to spin-independent WIMP-nucleon interactions reaches a cross-section of $1.4\times10^{-48}$ cm$^2$ for a 50 GeV/c$^2$ mass WIMP at 90% confidence level, more than one order of magnitude beyond the current best limit, set by XENON1T. In addition, we show that for a 50 GeV/c$^2$ WIMP with cross-sections above $2.6\times10^{-48}$ cm$^2$ ($5.0\times10^{-48}$ cm$^2$) the median XENONnT discovery significance exceeds 3$\sigma$ (5$\sigma$). The expected sensitivity to the spin-dependent WIMP coupling to neutrons (protons) reaches $2.2\times10^{-43}$ cm$^2$ ($6.0\times10^{-42}$ cm$^2$).

Projected WIMP Sensitivity of the XENONnT Dark Matter Experiment

The XENON1T experiment at the Laboratori Nazionali del Gran Sasso (LNGS) is the first WIMP dark matter detector operating with a liquid xenon target mass above the ton-scale. Out of its 3.2t liquid xenon inventory, 2.0t constitute the active target of the dual-phase time projection chamber. The scintillation and ionization signals from particle interactions are detected with low-background photomultipliers. This article describes the XENON1T instrument and its subsystems as well as strategies to achieve an unprecedented low background level. First results on the detector response and the performance of the subsystems are also presented.

/pdf/the-xenon1t-dark-matter-experiment-znscubguz0.pdf

The XENON1T Dark Matter Experiment

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The XENON1T Dark Matter Experiment