Effective portals to heavy neutral leptons

Abstract

The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is strongly motivated by the observation of neutrino masses and mixing. The mass of these new particles could lie below the electroweak scale, making them accessible to low-energy laboratory experiments. Additional new physics at high energies can mediate new interactions between the Standard Model particles and HNLs, and is most conveniently parametrized by the neutrino Standard Model Effective Field Theory, or $\nu$SMEFT for short. In this work, we consider the dimension six $\nu$SMEFT operators involving one HNL field in the mass range of $\mathcal{O}(1)$ MeV $<M_N<\mathcal{O}(100)$ GeV. By recasting existing experimental limits on the production and decay of new light particles, we constrain the Wilson coefficients and new physics scale of each operator as a function of the HNL mass.

28 pages + appendices, 12 figures.v2: published in JHEP, no relevant changes. Bounds and plots can be found in https://github.com/mhostert/Heavy-Neutrino-Limits

References in corpus (19)

• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Low energy effects of neutrino masses
• LEP Shines Light on Dark Matter
• Heavy Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Right-handed neutrino magnetic moments
• Double Bangs from New Physics in IceCube
• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Improved Bhabha cross section at LEP and the number of light neutrino species
• The Irreducible Axion Background
• Revisiting cosmological bounds on sterile neutrinos
• Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher Dimension Operator at the Electroweak Scale
• Blast from the past II: Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment
• Revisiting the production of ALPs at B-factories
• Majorana neutrinos production at LHeC in an effective approach
• The MicroBooNE Experiment, the NuMI Absorber, and Heavy Neutral Leptons
• The see-saw portal at future Higgs Factories
• Long-lived heavy neutral leptons from mesons in effective field theory
• Reinterpretation of searches for long-lived particles from meson decays
• Re-examining $N_R$-EFT Upto Dimension Six

Cited by in corpus (22)

• Disentangling left and right-handed neutrino effects in $B\to K^{(\ast )}\nu \nu$
• Supernova Limits on Muonic Dark Forces
• Long-lived neutral fermions at the DUNE near detector
• Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
• Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• Search for Hidden Neutrinos at the European Spallation Source: the SHiNESS experiment
• Assessing WGC Compatibility in ModMax Black Holes via Photon Spheres Analysis and WCCC Validation
• Sensitivity prospects for lepton-trijet signals in the $\nu$SMEFT at the LHeC
• No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
• Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee
• Detecting LHC Neutrinos at Surface Level
• Right handed neutrino production from $Z^{\prime }$ interactions in forward search experiments
• Testable dark matter solution within the seesaw mechanism
• Mass Reconstruction of Heavy Neutral Leptons from Stopped Mesons
• Future collider sensitivities to $\nu$SMEFT interactions
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Long-Lived HNLs via ALP Portal at the LHC
• Cosmic Overture Echoed in a Stellar Final Act: Implications of Nanohertz Gravitational Waves for Core Collapse Supernova Neutrinos
• Heavy Neutral Lepton searches at an ICARUS-like detector using NuMI beam
• Sensitivity of $W$-boson measurements to low-mass right-handed neutrinos
• Impact of dim-6 $\nu$SMEFT operators on low-scale leptogenesis