The see-saw portal at future Higgs factories: the role of dimension six operators

Abstract

We study an extension of the Standard Model with electroweak scale right-handed singlet fermions $N$ that induces neutrino masses, plus a generic new physics sector at a higher scale $\Lambda$. The latter is parametrized in terms of effective operators in the language of the $\nu$SMEFT. We study its phenomenology considering operators up to $d=6$, where additional production and decay modes for $N$ are present in addition to those arising from the mixing with the active neutrinos. We focus on the production with four-Fermi operators and we identify the most relevant additional decay modes to be $N\to \nu \gamma$ and $N\to 3f$. We assess the sensitivity of future Higgs factories on the $\nu$SMEFT in regions of the parameter space where the new states decay promptly, displaced or are stable on detector lengths. We show that new physics scale up to $5-60$TeV can be explored, depending on the collider considered.

arXiv comment30 pages, 8 figures. v2: section with theoretical bounds added, matches version accepted for publication in JHEP

References in corpus (46)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• UFO - The Universal FeynRules Output
• Oscillating neutrinos and mu --> e, gamma
• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• The Search for Heavy Majorana Neutrinos
• 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
• Minimal Flavour Seesaw Models
• Designing and recasting LHC analyses with MadAnalysis 5
• 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
• Heavy neutrino searches at the LHC with displaced vertices
• Testing sterile neutrino extensions of the Standard Model at future lepton colliders
• General Neutrino Interactions from an Effective Field Theory Perspective
• Right-handed neutrino magnetic moments
• Displaced vertex searches for sterile neutrinos at future lepton colliders
• Combined explanations of B-physics anomalies: the sterile neutrino solution
• 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
• It's all right(-handed neutrinos): a new $W^{\prime }$ model for the $R_{D^{(\ast )}}$ anomaly
• Probing Baryogenesis with Displaced Vertices at the LHC
• $R(D^{(\ast )})$ from $W^{\prime }$ and right-handed neutrinos
• Long-lived Sterile Neutrinos at the LHC in Effective Field Theory
• Probing neutrino transition magnetic moments with coherent elastic neutrino-nucleus scattering
• Loops and trees in generic EFTs
• Updating neutrino magnetic moment constraints
• Higgs phenomenology as a probe of sterile neutrinos
• Inclusive Displaced Vertex Searches for Heavy Neutral Leptons at the LHC
• WIMP Dark Matter at the International Linear Collider
• Heavy neutral leptons in effective field theory and the high-luminosity 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
• Majorana neutrino decay in an Effective Approach
• Search for Long-Lived Heavy Neutrinos at the LHC with a VBF Trigger
• The see-saw portal at future Higgs Factories
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• Effective Majorana neutrino decay
• The effective field theory of low scale see-saw at colliders
• Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}{e}^{-}$ colliders
• Minimal flavor violation in the see-saw portal

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• Searches for Long-Lived Particles at the Future FCC-ee
• Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches
• Re-examining $N_R$-EFT Upto Dimension Six
• Lepton collider probes for Majorana neutrino effective interactions
• Search for the $Z^{\prime }$ boson decaying to a right-handed neutrino pair in leptophobic $\mathrm{U}(1)$ models