These models provide valuable insights into understanding neutrino masses, in the general context of RPV scenarios that have not been analyzed.

The gap

Consensus across the literature

Supporting evidence — 3 representative gaps

• The Forward Physics Facility at the High-Luminosity LHC (2023) · doi

  These models provide valuable insights into understanding neutrino masses, in the general context of RPV scenarios that have not been analyzed.

  Keywords: models provide valuable insights understanding neutrino masses general context scenarios analyzed
• Gravity-assisted neutrino masses (2026) · doi

  In this Letter, we have introduced a novel model- building framework in which the observed smallness of light neutrino masses arises “gravity-assisted”. While neutrino masses generated by a Planck-suppressed Wein- berg operator are expected to be too small, and the stan- dard type-I seesaw mechanism with order one couplings points to high-scale neutrino mass generation far above observational capabilities, the “gravity-assisted” scheme opens up new possibilities for constructing “low-scale” neutrino mass generation models, where light neutrino masses are “symmetry protected” and therefore techni- cally natural. No small model parameters or cancella- tions are required in order to arrive at models that ex- plain the small light neutrino masses while being within reach of the (HL-)LHC and future colliders and testable by precision experiments (e.g. on cLFV). Gravity-assisted neutrino masses arise in the presence of a global symmetry that is spontaneously broken at an intermediate scale between the electroweak and Planck leaving a remnant discrete symmetry that for- scales, bids light neutrino masses. After spontaneous symme- try breaking, masses and mixing with active neutrinos are generated for the HNLs, potentially suppressed by powers of ⟨ϕ⟩ /Λ. Nevertheless, light neutrinos remain massless due to the residual discrete symmetry, and pairs of right-chiral neutrinos form (at this level exact) heavy Dirac states. Light neutrino masses finally arise through gravity, when the residual symmetry is broken by Planck- suppressed effective operators. The result is small light neutrino masses and pseudo-Dirac pairs of heavy neutri- nos with masses that can lie within the reach of future collider experiments, far below the usually expected high seesaw scale. We described the proposed new scheme explicitly for the case of 2 HNLs and a global U(1) symmetry broken spontaneously to a Z3 subgroup. It leads to a plethora of new models with expected rich phenomenology that depends on the symmetry assignments. We illustrated “gravity-assisted” neutrino mass generation and its phe- nomenological implications for collider searches in a sim- ple benchmark realisation, leaving a more comprehensive exploration of the model class and its extensions for fu- ture work. In addition to predictions for future collider 5 searches and precision tests such as cLFV, which may allow to test and distinguish specific model realisations, various cosmological consequences also offer interesting discovery potential. For example, the breaking of the U(1) symmetry, spontaneously as well as explicitly by gravity, leads to a Pseudo-Nambu Goldstone boson with mass linked to MR. This breaking may additionally in- duce networks of hybrid topological defects composed of cosmic strings and domain walls, which may generate a testable contribution to the stochastic gravitational wave background. Beyond the class of models described above, various ex- tensions, generalisations and embeddings

  Keywords: neutrino masses symmetry light gravity model assisted small scale mass models planck suppressed expected generation
• Nucleon decays into three leptons: contact contributions (2026) · doi

  In addition, we present the analysis of an ultraviolet-complete model to demonstrate its connection with our theoretical framework, thereby facilitating further studies of these exotic nucleon decays in upcoming neutrino experiments with large fiducial masses.

  Keywords: addition present ultraviolet complete model demonstrate connection theoretical framework thereby facilitating further exotic nucleon decays