Probing Seesaw with Parity Restoration.

Area of Science:

• Particle Physics
• Cosmology
• High Energy Physics

Background:

• The seesaw mechanism is a leading explanation for the small masses of neutrinos.
• Minimal left-right symmetric models provide a theoretical framework incorporating this mechanism.
• Neutrino Dirac Yukawa couplings are crucial for understanding neutrino properties and decays.

Purpose of the Study:

• To propose a novel method for experimentally testing the seesaw origin of neutrino mass.
• To establish a connection between observable quantities and fundamental couplings in particle physics.
• To simplify the experimental determination of neutrino Dirac Yukawa couplings.

Main Methods:

• Investigating the leptonic interactions of doubly charged scalars.
• Analyzing the relationship between these interactions and neutrino Dirac Yukawa couplings.
• Proving that relevant physical quantities depend solely on the Hermitian part of the couplings.

Main Results:

• A direct link is established between doubly charged scalar interactions and neutrino Dirac Yukawa couplings.
• It is demonstrated that physical observables are functions of only the Hermitian part of these couplings.
• This finding offers a simplified pathway for experimental verification.

Conclusions:

• The proposed method provides a more straightforward approach to testing the seesaw mechanism.
• Experimental determination of neutrino Dirac Yukawa couplings can be significantly simplified.
• This work contributes to a deeper understanding of neutrino physics within extended gauge models.