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The triplet Higgs mechanism can explain neutrino masses and the universe's matter-antimatter imbalance. This model is testable with future colliders and experiments, offering a unified solution to key physics mysteries.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • The origin of neutrino masses remains unexplained.
  • The observed matter-antimatter asymmetry (baryon asymmetry) is a major cosmological puzzle.
  • Cosmic inflation is a leading theory for the early universe, but its underlying mechanism is unknown.

Purpose of the Study:

  • To investigate the role of the triplet Higgs in the type-II seesaw mechanism.
  • To explore if this mechanism can simultaneously address neutrino masses, baryon asymmetry, and inflation.
  • To determine the viable parameter space and phenomenological predictions of this model.

Main Methods:

  • Surveying the allowed parameter space for the triplet Higgs model.
  • Analyzing decay channels, particularly dominant leptonic decays.
  • Considering triplet masses and vacuum expectation values.

Main Results:

  • The triplet Higgs mechanism can simultaneously generate neutrino masses and baryon asymmetry, and play a role in inflation.
  • Viable parameter space exists for triplet masses as low as a TeV.
  • A small vacuum expectation value for the triplet (v_{Δ}<10 keV) is preferred, requiring dominant leptonic decays.

Conclusions:

  • The type-II seesaw mechanism with a triplet Higgs offers a unified solution to three major unsolved problems in physics.
  • The model predicts unique phenomenological signatures testable at future 100 TeV colliders.
  • Upcoming lepton flavor violation experiments (e.g., Mu3e) and neutrinoless double beta decay searches will probe this framework.