The see-saw portal at future Higgs Factories

Abstract

We consider an extension of the Standard Model with two right-handed singlet fermions with mass at the electroweak scale that induce neutrino masses, plus a generic new physics sector at a higher scale $\Lambda$. We focus on the effective operators of lowest dimension $d=5$, which induce new production and decay modes for the singlet fermions. We assess the sensitivity of future Higgs Factories, such as FCC-ee, CLIC-380, ILC and CEPC, to the coefficients of these operators for various center of mass energies. We show that future lepton colliders can test the cut-off of the theory up to $\Lambda \simeq 500-1000$TeV, surpassing the reach of future indirect measurements of the Higgs and $Z$ boson widths. We also comment on the possibility of determining the underlying model flavor structure should a New Physics signal be observed, and on the impact of higher dimensional $d=6$ operators on the experimental signatures.

arXiv comment31 pages, 13 figures, matches published version

References in corpus (31)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Oscillating neutrinos and mu --> e, gamma
• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Baryogenesis via neutrino oscillations
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Distinguishing seesaw models at LHC with multi-lepton signals
• Higgs Boson Studies at Future Particle Colliders
• Minimal Flavour Seesaw Models
• Designing and recasting LHC analyses with MadAnalysis 5
• Phenomenology of GeV-scale Heavy Neutral Leptons
• Towards a public analysis database for LHC new physics searches using MadAnalysis 5
• Heavy Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Operators up to Dimension Seven in Standard Model Effective Field Theory Extended with Sterile Neutrinos
• Testing sterile neutrino extensions of the Standard Model at future lepton colliders
• Right-handed neutrino magnetic moments
• Displaced vertex searches for sterile neutrinos at future lepton colliders
• Testable Baryogenesis in Seesaw Models
• θ_{13} and Proton Decay in a Minimal SO(10) x S_4 model of Flavor
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• The seesaw portal in testable models of neutrino masses
• Probing Baryogenesis with Displaced Vertices at the LHC
• Constraining Sterile Neutrinos from Precision Higgs Data
• Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher Dimension Operator at the Electroweak Scale
• Higgs phenomenology as a probe of sterile neutrinos
• Inclusive Displaced Vertex Searches for Heavy Neutral Leptons at the LHC
• Probes of the Standard Model effective field theory extended with a right-handed neutrino
• Majorana vs Pseudo-Dirac Neutrinos at the ILC
• The seesaw path to leptonic CP violation
• Search for Long-Lived Heavy Neutrinos at the LHC with a VBF Trigger
• Minimal flavor violation in the see-saw portal

Cited by in corpus (22)

• Searches for Long-Lived Particles at the Future FCC-ee
• Effective portals to heavy neutral leptons
• Heavy neutral leptons in effective field theory and the high-luminosity LHC
• Probing right-handed neutrinos dipole operators
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches
• The see-saw portal at future Higgs factories: the role of dimension six operators
• Re-examining $N_R$-EFT Upto Dimension Six
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Lepton collider probes for Majorana neutrino effective interactions
• Illuminating the dark: mono-$\gamma$ signals at NA62
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Two portals to GeV sterile neutrinos : dipole versus mixing
• Sensitivity prospects for lepton-trijet signals in the $\nu$SMEFT at the LHeC
• Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Future collider sensitivities to $\nu$SMEFT interactions
• Phenomenology of Dirac neutrino EFTs up to dimension six
• Di-decay signature of new physics particles at intensity frontier experiments
• Riding the Seesaw: What Higgsstrahlung May Reveal about Massive Neutrinos