The Search for Heavy Majorana Neutrinos

Abstract

The Majorana nature of neutrinos can be experimentally verified only via {\it lepton-number} violating processes involving charged leptons. We study 36 lepton-number violating ($\lv$) processes from the decays of tau leptons and pseudoscalar mesons. These decays are absent in the Standard Model but, in presence of Majorana neutrinos in the mass range $\sim 100 \mev$ to $5 \gev$, the rates for these processes would be enhanced due to their resonant contribution. We calculate the transition rates and branching fractions and compare them to the current bounds from direct experimental searches for $\dl=2$ tau and rare meson decays. The experimental non-observation of such $\lv$ processes places stringent bounds on the Majorana neutrino mass and mixing and we summarize the existing limits. We also extend the search to hadron collider experiments. We find that, at the Tevatron with $8{fb}^{-1}$ integrated luminosity, there could be $2\sigma$ ($5\sigma$) sensitivity for resonant production of a Majorana neutrino in the ${\mu }^{\pm }{\mu }^{\pm }$ modes in the mass range of $\sim 10 - 180 {\gev} (10 - 120 {\gev})$. This reach can be extended to $\sim 10 - 375 {\gev} (10 - 250 mbox{\gev})$ at the LHC of 14 TeV with $100{fb}^{-1}$. The production cross section at the LHC of 10 TeV is also presented for comparison. We study the ${\mu }^{\pm }{e}^{\pm }$ modes as well and find that the signal could be large enough even taking into account the current bound from neutrinoless double-beta decay. The signal from the gauge boson fusion channel $W^{+}{W}^{+}\to {\ell }_1^{+}{\ell }_2^{+}$ at the LHC is found to be very weak given the rather small mixing parameters. We comment on the search strategy when a $\tau$ lepton is involved in the final state.

60 pages, 27 figures, minor changes,some references added, matches the published version

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• Search for sterile neutrinos decaying into pions at the LHC
• Angular and polarization trails from effective interactions of Majorana neutrinos at the LHeC
• Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures
• Lepton Number Violation from Colored States at the LHC
• Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}{e}^{-}$ colliders
• Probing Left-Right Seesaw using Beam Polarization at an $e^{+}{e}^{-}$ Collider
• Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II
• Probing sterile neutrinos in the framework of inverse seesaw mechanism through leptoquark productions
• Majorana Neutrino Masses from Neutrinoless Double-Beta Decays and Lepton-Number-Violating Meson Decays
• Exploring GeV-scale Majorana neutrinos in lepton-number-violating ${\Lambda }_b^0$ baryon decays
• Automated Neutrino Jet and Top Jet Predictions at Next-to-Leading-Order with Parton Shower Matching in Effective Left-Right Symmetric Models
• ALP-portal majorana dark matter
• On Non-Unitary Lepton Mixing and Neutrino Mass Observables
• Atmospheric Sterile Neutrinos
• Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw
• Minimal flavor violation in the see-saw portal
• Signature of heavy sterile neutrinos at CEPC
• Top couplings and top partners
• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
• Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
• IceCube bounds on sterile neutrinos above 10 eV
• A model realizing inverse seesaw and resonant leptogenesis
• Top quark as a probe of heavy Majorana neutrino at the LHC and future collider
• Search for Majorana Neutrino Signal in $B_c$ Meson Rare Decay
• Revisiting Constraints on Fourth Generation Neutrino Masses
• Gamma-ray triangles: a possible signature of asymmetric dark matter in indirect searches
• Search for heavy Majorana neutrinos at electron-proton colliders
• Lepton collider probes for Majorana neutrino effective interactions
• Minimal inverse-seesaw mechanism with Abelian flavour symmetries
• Scrutinizing Vacuum Stability in IDM with Type-III Inverse seesaw
• Time-Delayed Electrons from Higgs Decays to Right-Handed Neutrinos
• Constraints on lepton number violating short-range interactions from $|\Delta L|=2$ processes
• Neutrino Masses from Low Scale Partial Compositeness
• Probing the Nature of Neutrinos with a New Force
• Space-time evolution of heavy sterile neutrinos in cascade decays
• Testing Neutrino Dipole Portal by Long-lived Particle Detectors at the LHC
• Vacuum Stability in Inert Higgs Doublet Model with Right-handed Neutrinos
• Long-lived heavy particles in neutrino mass models
• Double seesaw mechanism in a left-right symmetric model with TeV neutrinos
• Search for heavy Majorana neutrino in lepton number violating decays of D-> K pi e+ e+
• Lepton-number-violating decays of heavy flavors induced by doubly-charged Higgs boson
• Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)
• Testing left-right symmetry with an inverse seesaw mechanism at the LHC
• Requirements on common solutions to the LSND and MiniBooNE excesses: a post-MicroBooNE study
• A model of neutrino mass and dark matter with large neutrinoless double beta decay
• Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
• LFV Higgs and $Z$-boson decays: leptonic CPV phases and CP asymmetries
• Light dark matter from dark sector decay
• Up-scattering production of a sterile fermion at DUNE: complementarity with spallation source and direct detection experiments
• LHC Signatures for Cascade Seesaw Mechanism
• Tests of Low-Scale Leptogenesis in Charged Lepton Flavour Violation Experiments
• Angular and polarization observables for Majorana-mediated B decays with effective interactions
• Sensitivity Reach on the Heavy Neutral Leptons and $\tau$-Neutrino Mixing $|U_{\tau N}{|}^2$ at the HL-LHC
• Michel parameters in the presence of massive Dirac and Majorana neutrinos
• Revisiting sterile neutrino dark matter in gauged $U(1{)}_{B-L}$ model
• Distinguishing between lepton number violating scalars at the LHC
• Naturalness and lepton number/flavor violation in inverse seesaw models
• Sterile neutrino dark matter with dipole interaction
• Light sterile neutrinos and lepton-number-violating kaon decays in effective field theory
• Search for light sterile neutrinos from $W^{\pm }$ decays at the LHC
• Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels
• A supersymmetric electroweak scale seesaw model
• Collider Phenomenology of $e^{-}{e}^{-}\to W^{-}{W}^{-}$
• Heavy Majorana Neutrino Production at Future $ep$ Colliders
• Low-Energy Supernovae Bounds on Sterile Neutrinos
• Prospects for new physics in $\tau \to l\mu \mu$ at current and future colliders
• Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
• Seesaw Type I and III at the LHeC
• Connections between the Seesaw and Dark Matter Searches
• Neutrino Mass and $\mu \to e+\gamma$ from a Mini-Seesaw
• Search for a light $Z^{\prime }$ at LHC in a neutrinophilic $U(1)$ model
• Searching for heavy neutrino in terms of tau lepton at future hadron collider
• Interference effect in lepton number violating and conserving meson decays for a left-right symmetric model
• A 17 MeV pseudoscalar and the LSND, MiniBooNE and ATOMKI anomalies
• The Type-I Seesaw family
• The study of two quasi-degenerate heavy sterile neutrinos in rare meson decays
• Search for direct production of winos and higgsinos in events with two same-charge leptons or three leptons in $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
• The case for mixed dark matter from sterile neutrinos
• Roles of sterile neutrinos in particle physics and cosmology
• Majorana neutrinos with effective interactions in B decays
• Searching for New Long Lived Particles in Heavy Ion Collisions at the LHC
• Search for lepton-flavor violating decays $D^0\to X^0{e}^{\pm }{\mu }^{\mp }$
• Probing the Decoupled Seesaw Scalar in Rare Higgs Decay
• Search for light long-lived particles decaying to displaced jets in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
• Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton
• LHC signals for Singlet Neutrinos from a Natural Warped Seesaw (I)
• TeV-scale seesaw mechanism catalyzed by the electron mass
• A potential scenario for the Majorana neutrino detection at future lepton colliders
• Probing charged lepton number violation via ${\ell }^{\pm }{\ell }^{\prime \pm }{W}^{\mp }{W}^{\mp }$
• Experimental constraints on the neutrino and gauge parameters of the super-weak U(1) extension of the standard model
• Low-scale leptogenesis with flavour and CP symmetries
• Phenomenology of $keV$ sterile neutrino in minimal extended seesaw
• Tevatron Discovery Potential for Fourth Generation Neutrinos: Dirac, Majorana and Everything in Between
• On the Minimal Mixing of Heavy Neutrinos
• Time-delayed electrons from neutral currents at the LHC
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• Discovering heavy neutrino oscillations in rare Bc meson decays at HL-LHCb
• Study Standard Model and Majorana Neutrino Contributions to $B^{+}\to K^{(\ast )\pm }{\mu }^{+}{\mu }^{\mp }$
• Symmetry, dark matter and LHC phenomenology of the minimal $\nu$SM
• Probing heavy triplet leptons of the type-III seesaw mechanism at future muon colliders
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Hadron Collider Tests of Neutrino Mass-Generating Mechanisms
• Perturbativity in the seesaw mechanism
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production
• Investigating two heavy neutral leptons neutrino seesaw mechanism at SHiP
• Search for rare or forbidden decays of the $D^0$ meson
• Heavy Neutral Leptons at Beam Dump Experiments of Future Lepton Colliders
• TeV-scale seesaw with non-negligible left-right neutrino mixings
• Experimental Sensitivity for Majorana Neutrinos Produced via a Z Boson at Hadron Colliders
• Neutrino masses from new generations
• Lepton Number Violation in TeV Scale See-Saw Extensions of the Standard Model
• Right-handed Dirac and Majorana neutrinos at Belle II
• $\Delta$L=2 hyperon decays induced by Majorana neutrinos and doubly-charged scalars
• Lepton Number Violation and Scalar Searches at the LHC
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• Natural neutrino sector in a 331-model with Froggatt-Nielsen mechanism
• One-loop contribution to the neutrino mass matrix in NMSSM with right-handed neutrinos and tri-bimaximal mixing
• Interplay between non-interfering neutrino exchange mechanisms and nuclear matrix elements in $0\nu \beta \beta$ decay
• CP violation with GeV-scale Majorana neutrino in ${\Lambda }_b\to ({\Lambda }_c^{+},p^{+}){\pi }^{+}{\mu }^{-}{\mu }^{-}$ decays
• $\mu$-$\tau$ symmetry breaking and CP violation in the neutrino mass matrix
• Doubly-charged scalar in rare decays of $B_c$ meson
• Constraints on exotic lepton doublets with minimal coupling to the standard model
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• SM extension with a gauged flavor $U(1{)}_F$ symmetry
• Search for Hidden Neutrinos at the European Spallation Source: the SHiNESS experiment
• Resonant Majorana neutrino effects in $\Delta$L=2 four-body hyperon decays
• $\nu$ Electroweak Baryogenesis
• Light Majorana Neutrinos in (Semi)invisible Meson Decays
• Parameterizing Majorana Neutrino Couplings in the Higgs Sector
• Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at $\sqrt{s}$ = 13 TeV
• Long-Lived Particles and the Quiet Sun
• Long-lived Sterile Neutrino Searches at Future Muon Colliders
• Radiative Neutrino Masses in the ${\nu }_R$MSSM
• Two portals to GeV sterile neutrinos : dipole versus mixing
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Search for like-sign dileptons plus two jets signal in the framework of the manifest left-right symmetric model
• TeV-scale Pseudo-Dirac Seesaw Mechanisms in an E${}_6$ Inspired Model
• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Workshop summary -- Kaons@CERN 2023
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Large lepton number violation at colliders: predictions from the minimal linear seesaw mechanism
• Prospects for Heavy Neutral Lepton Searches at Short and Medium Baseline Reactor Experiments
• Sterile neutrinos in ${\Lambda }_b^0\to ({\Lambda }_c^{+},p^{+}){\ell }_1^{-}{\ell }_2^{-}{\ell }_3^{+}\nu$ decays
• Constraining sleptons at the LHC in a supersymmetric low-scale seesaw scenario
• Search for heavy Majorana neutrinos at future lepton colliders
• On the impact of heavy meson production spectra on searches for heavy neutral leptons
• Large $\nu$-$\bar{\nu }$ Oscillations from High-Dimensional Lepton Number Violating Operator
• Nucleon Decays into Light New Particles in Neutrino Detectors
• Discovering the Origin of Neutrino Masses at SHiP
• Leptogenesis in GeV scale seesaw models
• Lepton flavor violation beyond the MSSM
• Experimental constraints from flavour changing processes and physics beyond the Standard Model
• Relaxing Limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with Axion-like Particles
• Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee
• Quasi-Dirac neutrinos in the linear seesaw model
• Dirac-Majorana neutrinos distinction in four-body decays
• Effects of Majorana Physics on the UHE ${\nu }_{\tau }$ Flux Traversing the Earth
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos
• Dark Matter and Neutrino Masses in a Portalino-like Model
• Timing-based mass measurement of exotic long-lived particles at the FCC-ee
• Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning
• Fat brane and seesaw mechanism in extra dimensions
• Pure leptonic proposal to $W^{+}{W}^{-}$ excess and neutrino mass generation
• Dark Matter and Lepton Flavour Violation in a Hybrid Neutrino Mass Model
• Probing Solar Heavy Neutrinos with Heliospheric Electrons
• Axion and FIMP Dark Matter in a $U(1)$ extension of the Standard Model
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• Modular-symmetry-protected seesaw
• Searches for Heavy Neutral Leptons at FCC-ee in final states including a muon
• Neutrino physics beyond neutrino masses
• Mass Reconstruction of Heavy Neutral Leptons from Stopped Mesons
• CP violation in the rare Higgs decays via exchange of on-shell almost degenerate Majorana neutrinos, $H\to {\nu }_k{N}_j\to {\nu }_k{\ell }^{-}U\bar{D}$ and $H\to {\nu }_k{N}_j\to {\nu }_k{\ell }^{+}\bar{U}D$
• Collider Prospects for the Neutrino Magnetic Moment Portal
• Search for New Physics in rare decays at LHCb
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Decay of $B^{\pm }\to {\tau }^{\pm }+$ "missing momentum" and direct measurement of the mixing parameter $U_{\tau N}$
• Searches for Lepton Flavour Violation and Lepton Number Violation in Hadron Decays
• Measuring CP violation in rare $W$ decays at the LHC
• Search for GeV-scale sterile neutrinos responsible for active neutrino oscillations and baryon asymmetry of the Universe
• Recent BABAR Results
• Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos
• Study of neutrinoless double beta decay in the Standard Model extended with sterile neutrinos
• Resolving a challenging supersymmetric low-scale seesaw scenario at the ILC
• Indirect search of Heavy Neutral Leptons using the DUNE Near Detector
• Standard and Non-Standard Aspects of Neutrino Physics
• New Physics Searches at Kaon and Hyperon Factories
• Probing Sterile Neutrino via Lepton Flavor Violating Decays of Mesons
• The Decay Q Value of Neutrinoless Double Beta Decay
• EUROnu-WP6 2010 Report
• Shedding light on the MiniBoone Excess with Searches at the LHC
• Probing heavy neutrinos in the COMET experiment
• Rare Kaon Decay Experiments at CERN
• Searching for light new physics at the LHC via lepton-number violation
• Theoretical and phenomenological consequences of active and sterile neutrino within Beyond Standard Model framework
• Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
• Simulation of the process $e^{+}{e}^{-}\to W^{+}{W}^{-}$ with the heavy right-handed neutrino exchange at 1 TeV future lepton colliders
• Massive Majorana neutrinos in matter and a magnetic field
• Sterile neutrino Dark Matter in the minimal Dirac Seesaw
• Can SUSY relax LNV constraints coming from loop corrections to light neutrino masses on the low-scale Seesaw?
• Sterile neutrinos and $R_K$
• How many new particles do we need after the Higgs boson?
• Searches for Light Exotics at LHCb
• Heavy neutrino searches from MeV to TeV
• Exact parametrization of a minimal seesaw model
• Photons coming from an opaque obstacle as a manifestation of heavy neutrino decays
• Heavy Neutral Lepton searches at an ICARUS-like detector using NuMI beam
• Lepton number violating and conserving heavy baryon four-body decays in the presence of two almost degenerate heavy neutrinos
• CP violation in $B_s$ decays mediated by two nearly-degenerate Majorana neutrinos
• Characterizing Heavy Neutral Fermions via their Decays
• Summary of the CKM 2014 working group on rare decays
• Generation as Compositeness: A Subconstituent Interpretation of the $B$-Lattice Flavor Hierarchy