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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • The strong CP problem remains a significant challenge in the Standard Model of particle physics.
  • Neutrino masses require physics beyond the Standard Model, with axions being a compelling candidate for new physics.
  • Axions are hypothetical particles proposed to solve the strong CP problem and are also viable dark matter candidates.

Purpose of the Study:

  • To propose a generalized axion framework incorporating two-loop Majorana neutrino mass generation.
  • To demonstrate how this framework addresses the strong CP problem via Peccei-Quinn symmetry.
  • To outline experimental strategies for probing axion properties and their cosmological implications.

Main Methods:

  • Developing a generalized Kim-Shifman-Vainshtein-Zakharov-type axion model.
  • Incorporating colored fermions and scalars as mediators for two-loop neutrino mass generation.
  • Analyzing the axion-to-photon coupling for detection at helioscopes and haloscopes.
  • Investigating axion dark matter production mechanisms in the early Universe.

Main Results:

  • A consistent theoretical framework for axion-mediated neutrino masses and the strong CP solution.
  • Distinct experimental signatures for various model setups, enabling probing of axion-photon couplings.
  • Predictions for axion dark matter abundance and production channels.

Conclusions:

  • The proposed framework offers a unified approach to neutrino masses and the strong CP problem.
  • Experimental searches at helioscopes and haloscopes can distinguish different axion model realizations.
  • The study provides insights into the potential role of axions as dark matter in the early Universe.