Majorana vs Pseudo-Dirac Neutrinos at the ILC

Abstract

Neutrino masses could originate in seesaw models testable at colliders, with light mediators and an approximate lepton number symmetry. The minimal model of this type contains two quasi-degenerate Majorana fermions forming a pseudo-Dirac pair. An important question is to what extent future colliders will have sensitivity to the splitting between the Majorana components, since this quantity signals the breaking of lepton number and is connected to the light neutrino masses. We consider the production of these neutral heavy leptons at the ILC, where their displaced decays provide a golden signal: a forward-backward charge asymmetry, which depends crucially on the mass splitting between the two Majorana components. We show that this observable can constrain the mass splitting to values much lower than current bounds from neutrinoless double beta decay and natural loop corrections.

arXiv comment16 pages, 5 figures; v2: Minor changes, version accepted for publication in EPJC

References in corpus (51)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• FastJet user manual
• Oscillating neutrinos and mu --> e, gamma
• SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+ e- colliders
• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• SARAH 4: A tool for (not only SUSY) model builders
• SPheno 3.1: extensions including flavour, CP-phases and models beyond the MSSM
• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• Baryogenesis via neutrino oscillations
• Neutrinos and Collider Physics
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Matter and Antimatter in the Universe
• SARAH 3.2: Dirac Gauginos, UFO output, and more
• Electroweak-Scale Resonant Leptogenesis
• Novel Supersymmetric SO(10) Seesaw Mechanism
• Radiatively Induced Neutrino Masses and Large Higgs-Neutrino Couplings in the Standard Model with Majorana Fields
• Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos
• Minimal Flavour Seesaw Models
• TeV Scale See-Saw Mechanisms of Neutrino Mass Generation, the Majorana Nature of the Heavy Singlet Neutrinos and $\betabeta$-Decay
• The nuMSM, leptonic asymmetries, and properties of singlet fermions
• Minimal Radiative Neutrino Mass Mechanism for Inverse Seesaw Models
• Neutrinoless Double Beta Decay and Heavy Sterile Neutrinos
• Neutrinoless double beta decay in seesaw models
• Higgs doublet decay as the origin of the baryon asymmetry
• Displaced vertex searches for sterile neutrinos at future lepton colliders
• Testable Baryogenesis in Seesaw Models
• The seesaw portal in testable models of neutrino masses
• Testing the low scale seesaw and leptogenesis
• Sterile neutrino searches via displaced vertices at LHCb
• The minimal 3+2 neutrino model versus oscillation anomalies
• Can heavy neutrinos dominate neutrinoless double beta decay?
• Probing Baryogenesis with Displaced Vertices at the LHC
• Same Sign versus Opposite Sign Dileptons as a Probe of Low Scale Seesaw Mechanisms
• Baryogenesis through Neutrino Oscillations: A Unified Perspective
• Kinetic Equations for Baryogenesis via Sterile Neutrino Oscillation
• Addressing the Majorana vs. Dirac Question with Neutrino Decays
• Lepton number violation as a key to low-scale leptogenesis
• Quasi-Dirac neutrinos at the LHC
• Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays
• One-loop corrections to the seesaw mechanism in the multi-Higgs-doublet Standard Model
• Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis
• GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations
• Novel SM-like Higgs decay into displaced heavy neutrino pairs in U(1)' models
• Baryogenesis from L-violating Higgs-doublet decay in the density-matrix formalism
• Leptogenesis from Oscillations of Heavy Neutrinos with Large Mixing Angles
• Neutrino masses, leptogenesis and dark matter from small lepton number violation?
• On the importance of the 1-loop finite corrections to seesaw neutrino masses
• l W nu production at CLIC: a window to TeV scale non-decoupled neutrinos
• GeV-scale hot sterile neutrino oscillations: a numerical solution
• Probing the Dirac or Majorana nature of the Heavy Neutrinos in pure leptonic decays at the LHC

Cited by in corpus (41)

• Neutrinoless double beta decay versus other probes of heavy sterile neutrinos
• The Present and Future Status of Heavy Neutral Leptons
• Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC
• A frequentist analysis of three right-handed neutrinos with GAMBIT
• Searches for Long-Lived Particles at the Future FCC-ee
• Vector-like Singlet Quarks: a Roadmap
• On Lepton Number Violation in Heavy Neutrino Decays at Colliders
• Reinterpreting the ATLAS bounds on heavy neutral leptons in a realistic neutrino oscillation model
• Search for Long-Lived Heavy Neutrinos at the LHC with a VBF Trigger
• Fat Jet Signature of a Heavy Neutrino at Lepton Collider
• The see-saw portal at future Higgs Factories
• Interference effects in LNV and LFV semileptonic decays: the Majorana hypothesis
• Probing right-handed neutrinos dipole operators
• Bounds on right-handed neutrino parameters from observable leptogenesis
• Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches
• Dirac vs. Majorana HNLs (and their oscillations) at SHiP
• New Benchmark Models for Heavy Neutral Lepton Searches
• SN1987A still shining: A Quest for Pseudo-Dirac Neutrinos
• The see-saw portal at future Higgs factories: the role of dimension six operators
• Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders
• A quantitative study on helicity inversion in Majorana neutrino decays at the LHC
• Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}{e}^{-}$ colliders
• Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II
• Z-Boson Decays into Majorana or Dirac (Heavy) Neutrinos
• Lepton collider probes for Majorana neutrino effective interactions
• Gravity-improved metastability bounds for the Type-I Seesaw Mechanism
• CP Violation in Rare Lepton-Number-Violating $W$ Decays at the LHC
• Revisiting (s)neutrino dark matter in natural SUSY
• Sensitivity Reach on the Heavy Neutral Leptons and $\tau$-Neutrino Mixing $|U_{\tau N}{|}^2$ at the HL-LHC
• Towards UV-Models of Kinetic Mixing and Portal Matter III: Relating Portal Matter and R-H Neutrino Masses
• Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Testing quasi-Dirac leptogenesis through neutrino oscillations
• $1\leftrightarrow 2$ Processes of a Sterile Neutrino Around Electroweak Scale in the Thermal Plasma
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Future collider sensitivities to $\nu$SMEFT interactions
• Resolving a challenging supersymmetric low-scale seesaw scenario at the ILC
• Can SUSY relax LNV constraints coming from loop corrections to light neutrino masses on the low-scale Seesaw?