The Present and Future Status of Heavy Neutral Leptons

Abstract

The existence of non-zero neutrino masses points to the likely existence of multiple SM neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as Heavy Neutral Leptons (HNLs). In this white paper we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding on key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.

arXiv comment82 pages, 34 figures. Contribution to Snowmass 2021

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• Effective lepton flavor violating $\mathbf{H}{\mathbf{\ell }}_{\mathbf{i}}{\mathbf{\ell }}_{\mathbf{j}}$ vertex from right-handed neutrinos within the mass insertion approximation
• Understanding the MiniBooNE and the muon and electron $g-2$ anomalies with a light $Z^{\prime }$ and a second Higgs doublet
• Status of rates and rate equations for thermal leptogenesis
• Search for heavy lepton partners of neutrinos in proton-proton collisions in the context of the type III seesaw mechanism
• Heavy neutral leptons in effective field theory and the high-luminosity LHC
• Radiative Generation of Lepton Masses with the $U(1{)}^{\prime }$ Gauge Symmetry
• Implementation of the type III seesaw model in FeynRules/MadGraph and prospects for discovery with early LHC data
• Reinterpreting the ATLAS bounds on heavy neutral leptons in a realistic neutrino oscillation model
• Heavy sterile neutrino emission in core-collapse supernovae: Constraints and signatures
• Search for evidence of the type-III seesaw mechanism in multilepton final states in proton-proton collisions at sqrt(s) = 13 TeV
• Non-unitary neutrino mixing in short and long-baseline experiments
• Majorana vs Pseudo-Dirac Neutrinos at the ILC
• On neutrinoless double beta decay in the $\nu$MSM
• Sterile Neutrino Dark Matter and Low Scale Leptogenesis from a Charged Scalar
• Searching for Physics Beyond the Standard Model in an Off-Axis DUNE Near Detector
• Monochromatic dark neutrinos and boosted dark matter in noble liquid direct detection
• Fermion number violating effects in low scale leptogenesis
• Neutrino Signal of Collapse-Induced Thermonuclear Supernovae: The Case for Prompt Black Hole Formation in SN1987A
• New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders
• Dark sector origin of the KOTO and MiniBooNE anomalies
• Searches for lepton number violating $K^{+}$ decays
• Kubo relations and radiative corrections for lepton number washout
• New limits on heavy sterile neutrino mixing in ${}^8\mathrm{B}$-decay obtained with the Borexino detector
• The seesaw path to leptonic CP violation
• Flavour Mixing of Neutrinos and Baryon Asymmetry of the Universe
• The 30-Year Search for the Compact Object in SN 1987A
• Neutrino beam-dump experiment with FASER at the LHC
• Revision of the LHCb Limit on Majorana Neutrinos
• Sterile neutrino oscillations in core-collapse supernovae
• Phenomenology of the Generalised Scotogenic Model with Fermionic Dark Matter
• See-Saw Type Mixing and ${\nu }_{\mu }\to {\nu }_{\tau }$ Oscillations
• $Z^{\prime }$, Higgses and heavy neutrinos in $U(1{)}^{\prime }$ models: from the LHC to the GUT scale
• Two-Higgs doublet solution to the LSND, MiniBooNE and muon $g-2$ anomalies
• Electroweak vacuum stability in presence of singlet scalar dark matter in TeV scale seesaw models
• The Cosmic Evolution of Faint Satellite Galaxies as a Test of Galaxy Formation and the Nature of Dark Matter
• Jet substructure shedding light on heavy Majorana neutrinos at the LHC
• Einstein-Cartan Portal to Dark Matter
• New constraints on Heavy Neutral Leptons from Super-Kamiokande data
• Lepton Number Violation at Colliders from Kinematically Inaccessible Gauge Bosons
• Lifting the core-collapse supernova bounds on keV-mass sterile neutrinos
• Vacuum Stability Constraints on the Minimal Singlet TeV Seesaw Model
• An allowed window for heavy neutral leptons below the kaon mass
• Searches for Lepton Number Violation and Resonances in $K^{\pm }\to \pi \mu \mu$ Decays
• The Neutrino Option
• Sterile neutrino dark matter via coinciding resonances
• A Comprehensive Framework for Studying $W^{\prime }$ and $Z^{\prime }$ Bosons at Hadron Colliders with Automated Jet Veto Resummation
• Strong Washout Approximation to Resonant Leptogenesis
• A little theory of everything, with heavy neutral leptons
• Search for type-III seesaw heavy leptons in dilepton final states in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• GeV-scale hot sterile neutrino oscillations: a numerical solution
• Cosmological Dependence of Non-resonantly Produced Sterile Neutrinos
• Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
• Precision study of GeV-scale resonant leptogenesis
• Lyman-$\alpha$ forest constraints on interacting dark sectors
• Automated simulations beyond the Standard Model: supersymmetry
• The active muon shield in the SHiP experiment
• Higgs Boson Mass Bounds in the Standard Model with Type III and Type I Seesaw
• Probing Seesaw with Parity Restoration
• Sterile Neutrino Dark Matter in Left-Right Theories
• Neutrino Masses and Higgs Vacuum Stability
• Warm Dark Matter from keVins
• Constraints on mixed dark matter from anomalous strong lens systems
• Kadanoff-Baym approach to the thermal resonant leptogenesis
• Heavy Neutral Leptons from kaon decays in the SHiP experiment
• Majorana Neutrinos in Same-Sign $W^{\pm }{W}^{\pm }$ Scattering at the LHC: Breaking the TeV Barrier
• Direct Search for Right-handed Neutrinos and Neutrinoless Double Beta Decay
• Search for Long-Lived Heavy Neutrinos at the LHC with a VBF Trigger
• Physics with Far Detectors at Future Lepton Colliders
• The broadening of Lyman-alpha forest absorption lines
• Corrigendum to "Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis"
• Heavy sterile neutrinos in stellar core-collapse
• Search for right-handed neutrinos from dark matter annihilation with gamma-rays
• Tau lepton asymmetry by sterile neutrino emission -- Moving beyond one-zone supernova models
• Lepton Flavor Violating Dilepton Dijet Signatures from Sterile Neutrinos at Proton Colliders
• Nearly degenerate heavy sterile neutrinos in cascade decay: mixing and oscillations
• The MicroBooNE Experiment, the NuMI Absorber, and Heavy Neutral Leptons
• Search for Heavy Neutrinos in $K^{+}\to {\mu }^{+}{\nu }_{\mu }$ Decays
• Parameter space of baryogenesis in the $\nu$MSM
• New constraints on tau-coupled Heavy Neutral Leptons with masses $m_N=280-970$ MeV
• Searches for Atmospheric Long-Lived Particles
• Sterile neutrino dark matter via GeV-scale leptogenesis?
• Safe Jet Vetoes
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• Massive sterile neutrinos in the early universe: From thermal decoupling to cosmological constraints
• Initial condition for baryogenesis via neutrino oscillation
• Heavy neutrinos from gluon fusion
• Leptonic anomalous magnetic moments in $\nu$SMEFT
• The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis
• Possible Hints of Sterile Neutrinos in Recent Measurements of the Hubble Parameter
• The spatial distribution of Milky Way satellites, gaps in streams and the nature of dark matter
• HECATE: A long lived particle detector concept for the FCC-ee or CEPC
• Dirac vs. Majorana HNLs (and their oscillations) at SHiP
• Search for heavy neutral leptons in $W^{+}\to {\mu }^{+}{\mu }^{\pm }\text{jet}$ decays
• Towards constraining warm dark matter with stellar streams through neural simulation-based inference
• Probing the Dirac or Majorana nature of the Heavy Neutrinos in pure leptonic decays at the LHC
• Search for lepton number and flavour violation in $K^{+}$ and ${\pi }^0$ decays
• Flavoured Resonant Leptogenesis at Sub-TeV Scales
• Vacuum stability with spontaneous violation of lepton number
• Assessing Perturbativity and Vacuum Stability in High-Scale Leptogenesis
• Explaining the MiniBooNE Anomalous Excess via Leptophilic ALP-Sterile Neutrino Coupling
• Three-Body Decays of Heavy Dirac and Majorana Fermions
• Constraints on TeV scale Majorana neutrino phenomenology from the Vacuum Stability of the Higgs
• Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM
• Probing invisible decay of dark photon at BESIII and future STCF via monophoton searches
• 21-cm observations and warm dark matter models
• Impact of sterile neutrino dark matter on core-collapse supernovae
• Visible Sterile Neutrinos as the Earliest Relic Probes of Cosmology
• MeV-scale Seesaw and Leptogenesis
• Constraining sterile neutrinos by core-collapse supernovae with multiple detectors
• Constraining minimal Type-III Seesaw Model from naturalness, Lepton Flavor Violation and Electroweak Vacuum stability
• A Naturally Light Sterile neutrino in an Asymmetric Dark Matter Model
• Possible pre-LEP200 SUSY threshold signals
• Looking forward to test the KOTO anomaly with FASER
• Exploring the Potential of Short-Baseline Physics at Fermilab
• Searching for a light $Z^{\prime }$ through Higgs production at the LHC
• Lepton-Trijet and Displaced Vertex Searches for Heavy Neutrinos at Future Electron-Proton Colliders
• Model-Independent Constraints on Non-Unitary Neutrino Mixing from High-Precision Long-Baseline Experiments
• Galaxy Formation in Sterile Neutrino Dark Matter Models
• Dark Matter Relic Abundance and Light Sterile Neutrinos
• Testing $\nu$MSM with indirect searches
• Freeze-out of baryon number in low-scale leptogenesis
• Electroweak Vacuum Stability and the Seesaw Mechanism Revisited
• When FIMPs Decay into Neutrinos: The $N_{\mathrm{eff}}$ Story
• Constraints on Decaying Sterile Neutrinos from Solar Antineutrinos
• On the robustness of IceCube's bound on sterile neutrinos in the presence of non-standard interactions
• The XMM Cluster Survey: new evidence for the 3.5 keV feature in clusters is inconsistent with a dark matter origin
• The X-Ray Line Feature At 3.5 Kev In Galaxy Cluster Spectra
• Can a bright and energetic X-ray pulsar be hiding amid the debris of SN 1987A?
• Type-III see-saw: Search for triplet fermions in final states with multiple leptons and fat-jets at 13 TeV LHC
• Type-III Seesaw: Phenomenological Implications of the Information Lost in Decoupling from High-Energy to Low-Energy
• Revisiting the LHC reach in the displaced region of the minimal left-right symmetric model
• Kinetic equations for sterile neutrinos from thermal fluctuations
• A quantitative study on helicity inversion in Majorana neutrino decays at the LHC
• On expansions in neutrino effective field theory
• Dark Matter-Neutrino Interconversion at COHERENT, Direct Detection, and the Early Universe
• Dark matter annihilation into right-handed neutrinos and the galactic center gamma-ray excess
• Dark Matter or Neutrino recoil? Interpretation of Recent Experimental Results
• Electroweak Absolute, Meta-, and Thermal Stability in Neutrino Mass Models
• Exotic Sterile Neutrinos and Pseudo-Goldstone Phenomenology
• Response to a comment on Dessert et al. "The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations"
• Z-Boson Decays into Majorana or Dirac (Heavy) Neutrinos
• Consistency of the dynamical high-scale type-I seesaw mechanism
• Heavy Neutrino-Antineutrino Oscillations in Quantum Field Theory
• Cosmological implications of Standard Model criticality and Higgs inflation
• Scrutinizing Vacuum Stability in IDM with Type-III Inverse seesaw
• The interpolating formula for the $0\nu \beta \beta$-decay half-life in the case of light and heavy neutrino mass mechanisms
• Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies
• Projected NA62 sensitivity to heavy neutral lepton production in $K^{+}\to {\pi }^0{e}^{+}N$ decays
• Leptogenesis in models with keV sterile neutrino dark matter
• Gravitational microlensing as a probe for dark matter clumps
• Higgs sector extension of the neutrino minimal standard model with thermal freeze-in production mechanism
• Sterile neutrino dark matter: Impact of active-neutrino opacities
• A Linear seesaw model with hidden gauge symmetry
• Beam impact tests of a prototype target for the Beam Dump Facility at CERN: experimental setup and preliminary analysis of the online results
• Light Sterile Neutrinos and a High-Quality Axion from a Holographic Peccei-Quinn Mechanism
• Constraining structure formation using EDGES
• Search for new phenomena in three- or four-lepton events in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Design Development for the Beam Dump Facility Target Complex at CERN
• Measurements of $\mu \to 3e$ Decay with Polarised Muons as a Probe of New Physics
• Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future
• Matter in the beam: Weak lensing, substructures and the temperature of dark matter
• Supernova Bounds on keV-mass Sterile Neutrinos
• $1\leftrightarrow 2$ Processes of a Sterile Neutrino Around Electroweak Scale in the Thermal Plasma
• Production of unstable heavy neutrinos in proto-neutron stars
• Flavour Covariant Formalism for Resonant Leptogenesis
• Production of GeV-scale heavy neutral leptons in 3-body decays. Comparison with the PYTHIA approach
• Relativistic Cyclotron Radiation Detection of Tritium Decay Electrons as a New Technique for Measuring the Neutrino Mass
• Testing extensions to LCDM on small scales with forthcoming cosmic shear surveys
• Rates and differential distributions in heavy neutral leptons production and decays
• Hunt for rare processes and long-lived particles at FCC-ee

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• Searches for Long-Lived Particles at the Future FCC-ee
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model III: Improved estimate of NLO contributions to the collision integral
• The symmetry approach to quark and lepton masses and mixing
• Dark sector searches with the CMS experiment
• Coupling Metric-Affine Gravity to the Standard Model and Dark Matter Fermions
• Upper Bound on Thermal Gravitational Wave Backgrounds from Hidden Sectors
• The Neutrino Magnetic Moment Portal and Supernovae: New Constraints and Multimessenger Opportunities
• Phenomenology of the simplest linear seesaw mechanism
• Dark Matter Dilution Mechanism through the Lens of Large Scale Structure
• Implications of the first CONUS+ measurement of coherent elastic neutrino-nucleus scattering
• Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders
• GRB 221009A Gamma Rays from Radiative Decay of Heavy Neutrinos?
• Search for the dipole portal of heavy neutral leptons at future colliders
• Extended Analysis of Neutrino-Dark Matter Interactions with Small-Scale CMB Experiments
• BSM Targets at a "Target-less DUNE"
• Sensitivity of the FACET experiment to Heavy Neutral Leptons and Dark Scalars
• W-mass Anomaly in the Simplest Linear Seesaw Mechanism
• New Physics Search at the CEPC: a General Perspective
• Primordial Black Hole Neutrinogenesis of Sterile Neutrino Dark Matter
• Explaining anomalies of $B$-physics, muon $g-2$ and $W$ mass in $R$-parity violating MSSM with seesaw mechanism
• New insights on $\nu$-DM Interactions
• Up-scattering production of a sterile fermion at DUNE: complementarity with spallation source and direct detection experiments
• Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
• Low-Energy Supernovae Bounds on Sterile Neutrinos
• Low-Scale Leptogenesis with Low-Energy Dirac CP-Violation
• Distinctive nuclear signatures of low-energy atmospheric neutrinos
• Modelling Heavy Neutral Leptons in Accelerator Beamlines
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Probing the Nature of Heavy Neutral Leptons in Direct Searches and Neutrinoless Double Beta Decay
• Towards the optimal beam dump experiment to search for feebly interacting particles
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• Interplay between non-interfering neutrino exchange mechanisms and nuclear matrix elements in $0\nu \beta \beta$ decay
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Impostor Among $\nu$s: Dark Radiation Masquerading as Self-Interacting Neutrinos
• Two portals to GeV sterile neutrinos : dipole versus mixing
• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Composite Dark Matter and Neutrino Masses from a Light Hidden Sector
• On the impact of heavy meson production spectra on searches for heavy neutral leptons
• Low scale leptogenesis under neutrino $\mu$-$\tau$ reflection symmetry
• Relaxing Limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with Axion-like Particles
• Sensitivity prospects for lepton-trijet signals in the $\nu$SMEFT at the LHeC
• Testing Heavy Neutral Leptons in Cosmic Ray Beam Dump experiments
• Workshop summary -- Kaons@CERN 2023
• Baryogenesis in a Parity Solution to the Strong CP Problem
• No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
• Testable dark matter solution within the seesaw mechanism
• Probing Solar Heavy Neutrinos with Heliospheric Electrons
• Mass Reconstruction of Heavy Neutral Leptons from Stopped Mesons
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• Search for heavy neutral leptons in electron-positron and neutral-pion final states with the MicroBooNE detector
• Searches for Heavy Neutral Leptons at FCC-ee in final states including a muon
• Timing-based mass measurement of exotic long-lived particles at the FCC-ee
• Modular-symmetry-protected seesaw
• Study of neutrinoless double beta decay in the Standard Model extended with sterile neutrinos
• Small Progenitors, Large Couplings: Type Ic Supernova Constraints on Radiatively Decaying Particles
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• From obstacle to opportunity: uncovering the silver lining of pileup
• Gauge hierarchy and metastability from Higgs-driven crunching
• Future collider sensitivities to $\nu$SMEFT interactions
• Tree-level unitarity constraints on heavy neutral leptons
• Dynamical origin of neutrino masses and dark matter from a new confining sector
• Semi-Visible Dark Photon Phenomenology at the GeV Scale
• Naturalness in Soft Leptogenesis and Gravitino Mass Bound due to Primordial Black Holes
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
• Rescuing leptogenesis in inverse seesaw models with the help of non-Abelian flavor symmetries
• Exploring ultra-high energy neutrino experiments through the lens of the transport equation
• Electromagnetic Leptogenesis -- an EFT-Consistent Analysis via Wilson Coefficients. Part I. Low-Scale, Non-Resonant Regime
• Long-Lived HNLs via ALP Portal at the LHC
• Simulation of the process $e^{+}{e}^{-}\to W^{+}{W}^{-}$ with the heavy right-handed neutrino exchange at 1 TeV future lepton colliders
• Heavy Neutral Lepton searches at an ICARUS-like detector using NuMI beam
• The Higgs boson, naturalness, and the Universe
• Di-decay signature of new physics particles at intensity frontier experiments
• Riding the Seesaw: What Higgsstrahlung May Reveal about Massive Neutrinos
• Can SUSY relax LNV constraints coming from loop corrections to light neutrino masses on the low-scale Seesaw?
• Ab initio short-range nuclear matrix elements for neutrinoless double-beta decay