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XENONnT WIMP Search: Signal & Background Modeling and Statistical Inference
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abstract
The XENONnT experiment searches for weakly-interacting massive particle (WIMP) dark matter scattering off a xenon nucleus. In particular, XENONnT uses a dual-phase time projection chamber with a 5.9-tonne liquid xenon target, detecting both scintillation and ionization signals to reconstruct the energy, position, and type of recoil. A blind search for nuclear recoil WIMPs with an exposure of 1.1 tonne-years (4.18 t fiducial mass) yielded no signal excess over background expectations, from which competitive exclusion limits were derived on WIMP-nucleon elastic scatter cross sections, for WIMP masses ranging from 6 GeV/$c^2$ up to the TeV/$c^2$ scale. This work details the modeling and statistical methods employed in this search. By means of calibration data, we model the detector response, which is then used to derive background and signal models. The construction and validation of these models is discussed, alongside additional purely data-driven backgrounds. We also describe the statistical inference framework, including the definition of the likelihood function and the construction of confidence intervals.
Forward citations
Cited by 5 Pith papers
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Light Dark Matter Search with 7.8 Tonne-Year of Ionization-Only Data in XENONnT
An S2-only analysis of 7.83 tonne-years of XENONnT data finds no dark matter excess and sets 90% CL limits, e.g. 6.0e-45 cm^2 for spin-independent scattering at 5 GeV/c^2.
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Dark Matter implications from the LZ, PandaX-4T and XENONnT Data
High-energy recoil excesses in LZ and XENONnT can be fit by velocity-dependent or inelastic dark matter at up to 4σ local significance, but the significance vanishes when xenon double-electron-capture charge yields ar...
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Neutrino electromagnetic properties and sterile dipole portal in light of the first solar CE$\nu$NS data
The paper derives the first 90% CL limits on neutrino magnetic moments, millicharges, and the sterile dipole portal from solar 8B CEνNS data in XENONnT and PandaX-4T.
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Search for Light Dark Matter in Low-Energy Ionization Signals from XENONnT
XENONnT's first science run excludes new parameter space for sub-keV bosonic dark matter absorption and 10-20 MeV/c^2 dark matter-electron scattering, setting the strongest direct-detection limits for these channels.
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Bounds on new neutrino interactions from the first CE$\nu$NS data at direct detection experiments
Using the first solar 8B CEνNS hints from XENONnT and PandaX-4T, the authors derive a combined low-energy weak mixing angle and place 90% limits on scalar, vector, axial-vector, and tensor neutrino mediator couplings.
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