Fog on the horizon: a new definition of the neutrino floor for direct dark matter searches

Abstract

The neutrino floor is a theoretical lower limit on WIMP-like dark matter models that are discoverable in direct detection experiments. It is commonly interpreted as the point at which dark matter signals become hidden underneath a remarkably similar-looking background from neutrinos. However, it has been known for some time that the neutrino floor is not a hard limit, but can be pushed past with sufficient statistics. As a consequence, some have recently advocated for calling it the "neutrino fog" instead. The downside of current methods of deriving the neutrino floor are that they rely on arbitrary choices of experimental exposure and energy threshold. Here we propose to define the neutrino floor as the boundary of the neutrino fog, and develop a calculation free from these assumptions. The technique is based on the derivative of a hypothetical experimental discovery limit as a function of exposure, and leads to a neutrino floor that is only influenced by the systematic uncertainties on the neutrino flux normalisations. Our floor is broadly similar to those found in the literature, but differs by almost an order of magnitude in the sub-GeV range, and above 20~GeV.

9+2 pages, 3+2 figures, code available at https://github.com/cajohare/NeutrinoFog

References in corpus (34)

• Results from a search for dark matter in the complete LUX exposure
• Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment
• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• DARWIN: towards the ultimate dark matter detector
• A new Generation of Standard Solar Models
• First Measurement of Coherent Elastic Neutrino-Nucleus Scattering on Argon
• The Diffuse Supernova Neutrino Background
• Complementarity of dark matter detectors in light of the neutrino background
• Neutrino Backgrounds to Dark Matter Searches
• Grand Unified Neutrino Spectrum at Earth: Sources and Spectral Components
• First results from the NEWS-G direct dark matter search experiment at the LSM
• Theia: An advanced optical neutrino detector
• Filtered Dark Matter at a First Order Phase Transition
• Search for Coherent Elastic Scattering of Solar ${}^8$B Neutrinos in the XENON1T Dark Matter Experiment
• An experiment to search for dark matter interactions using sodium iodide detectors
• Solar and Atmospheric Neutrinos: Background Sources for the Direct Dark Matter Searches
• Directional Dark Matter Detection Beyond the Neutrino Bound
• Prospects for dark matter searches in the pMSSM
• Searching for new physics with profile likelihoods: Wilks and beyond
• Improved EDELWEISS-III sensitivity for low-mass WIMPs using a profile likelihood approach
• The Future of Solar Neutrinos
• Directional recoil detection
• Can we overcome the neutrino floor at high masses?
• Solar neutrino physics with low-threshold dark matter detectors
• Can Solar Neutrinos be a Serious Background in Direct Dark Matter Searches?
• Reference worldwide model for antineutrinos from reactors
• Measurement of the ${}^8$B Solar Neutrino Flux in SNO+ with Very Low Backgrounds
• Dark Matter vs. Neutrinos: The effect of astrophysical uncertainties and timing information on the neutrino floor
• Exploring the hidden interior of the Earth with directional neutrino measurements
• Dark matter, light mediators, and the neutrino floor
• Global fit of pseudo-Nambu-Goldstone Dark Matter
• Time-integrated directional detection of dark matter
• Solar neutrinos and dark matter detection with diurnal modulation
• New Projections for Dark Matter Searches with Paleo-Detectors

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• Dark Matter Search Results from 1.54 Tonne$\cdot$Year Exposure of PandaX-4T
• Astrophysical Axion Bounds: The 2024 Edition
• The last Complex WIMPs standing
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• Can LIGO Detect Non-Annihilating Dark Matter?
• No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter
• Sensitivity projections for a dual-phase argon TPC optimized for light dark matter searches through the ionization channel
• Bounds on new neutrino interactions from the first CE$\nu$NS data at direct detection experiments
• First Search for Light Dark Matter in the Neutrino Fog with XENONnT
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• Transition Edge Sensors: Physics and Applications
• A neutrino floor for the Migdal effect
• A Quantum Description of Wave Dark Matter
• Beyond Hawking evaporation of black holes formed by dark matter in compact stars
• Solar neutrino constraints on light mediators through coherent elastic neutrino-nucleus scattering
• Dark Matter Candidates and Searches
• The XLZD Design Book: Towards the Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• DarkSide-20k sensitivity to light dark matter particles
• Mineral Detection of Neutrinos and Dark Matter. A Whitepaper
• EFT analysis of leptophilic dark matter at future electron-positron colliders in the mono-photon and mono-$Z$ channels
• Reactor neutrino liquid xenon coherent elastic scattering experiment
• Dark matter in the Scotogenic model with spontaneous lepton number violation
• Directional Detection of Dark Matter Using Solid-State Quantum Sensing
• Muon g-2, Neutralino Dark Matter and Stau NLSP
• Composite Dark Matter with Forbidden Annihilation
• Neutrinoless Double Beta Decay Sensitivity of the XLZD Rare Event Observatory
• Up-scattering production of a sterile fermion at DUNE: complementarity with spallation source and direct detection experiments
• Phenomenological profile of scotogenic fermionic dark matter
• Electron transport measurements in liquid xenon with Xenoscope, a large-scale DARWIN demonstrator
• ALETHEIA: Hunting for Low-mass Dark Matter with Liquid Helium TPCs
• Detailed nuclear structure calculations for coherent elastic neutrino-nucleus scattering
• New constraints on cosmic ray-boosted dark matter from the LUX-ZEPLIN experiment
• Study of cosmogenic activation above ground for the DarkSide-20k experiment
• Operation and performance of a dual-phase crystalline/vapor xenon time projection chamber
• SiPM array of Xenoscope, a full-scale DARWIN vertical demonstrator
• Measuring Solar neutrino Fluxes in Direct Detection Experiments in the Presence of Light Mediators
• The CYGNO experiment, a directional detector for direct Dark Matter searches
• Cryogenic SiPMs for the Optical Readout of DarkSide-20k
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• A new dark matter direct search based on archaeological Pb
• A Novel Low-Background Photomultiplier Tube Developed for Xenon Based Detectors
• Exploring Freeze-out and Freeze-in Dark Matter via Effective Froggatt-Nielsen Theory
• CYG$\nu$S: Detecting solar neutrinos with directional gas time projection chambers
• Nuclear Recoil Calibration at Sub-keV Energies in LUX and Its Impact on Dark Matter Search Sensitivity
• Search for Inelastic Boosted Dark Matter with the ICARUS Detector at the Gran Sasso Underground National Laboratory
• Testing the dark side of neutrino oscillations with the solar neutrino fog at Dark Matter experiments
• Bayesian technique to combine independently-trained Machine-Learning models applied to direct dark matter detection
• A Global Fit of Non-Relativistic Effective Dark Matter Operators Including Solar Neutrinos
• New light mediators and the neutrino fog: Implications from XENONnT nuclear recoil data
• Nuclear and electron scattering by neutrinos and dark matter in condensed systems
• Pseudo scalar dark matter in a generic U$(1{)}_X$ model
• Light Dark Matter Search with 7.8 Tonne-Year of Ionization-Only Data in XENONnT
• Weak Charge Form Factor Determination at the Electron-Ion Collider
• Tensor interaction in coherent elastic neutrino-nucleus scattering
• The Dark Matter Diffused Supernova Neutrino Background
• Comparable Dark Matter and Baryon energy densities from Dark Grand Unification
• Dirac dark matter, neutrino masses, and dark baryogenesis
• Revisiting big bang nucleosynthesis with a new particle species : effect of co-annihilation with nucleons
• Neutrino backgrounds in matter-wave interferometry: implications for dark matter searches and beyond-Standard Model physics
• Directional Direct Detection of MeV Scale Boosted Dark Matter in Two Component Dark Matter Scenario via Dark Photon Interaction
• Design and characterization of a photosensor system for the RELICS experiment
• Dark matter in the scale-invariant 3-3-1-1 model
• Hyper Stealth Dark Matter and Long-Lived Particles
• Characterizing CJPL's Site-Specific Neutrino Floor as the Neutrino Fog Boundary
• Measuring the Low-Energy Weak Mixing Angle with Supernova Neutrinos
• Dark Z-mediated dark matter with verifiable exotic scalars
• Searching for beyond-Standard-Model solar neutrino interactions using directional detectors
• A Closer Look in the Mirror: Reflections on the Matter/Dark Matter Coincidence
• A novel nuclear recoil calibration for liquid noble gas detectors
• Layered dark structure with a Structuring Field: A $Z_4$-symmetric Inert Doublet-Singlet realization and implications for the $S_8$ tension
• Radiative neutrino mass generation and dark matter through vectorlike leptons
• Shedding Light on Dark Matter at the LHC with Machine Learning
• Neutrino NSI in archaeological Pb
• Prospect of the NUCLEUS Experiment at Chooz for Coherent Elastic Neutrino-Nucleus Scattering and New Physics Searches
• Probing the Solar ${}^8$B Neutrino Fog with XENONnT
• Improved and automated krypton assay for low-background xenon detectors with Auto-RGMS
• The potential of directional neutrino detection to observe neutrino spin oscillations
• Deep Probabilistic Direction Prediction in 3D with Applications to Directional Dark Matter Detectors
• Background stability and annual modulation test using PICOLON ultra-pure NaI(Tl) detector
• A flexible test facility for liquid xenon detector development
• Light right-handed Smuons at the LHC: Natural dark matter and $g_{\mu }-2$ in an unexplored realm of the pMSSM
• Theoretical and Experimental Constraints on ${\mathbb{Z}}_{2n}$ Multi-Component Dark Matter Models
• Future accelerator projects: new physics at the energy frontier