Observable N-N oscillation in high scale seesaw models.

Area of Science:

• Particle Physics
• Cosmology
• Supersymmetry

Background:

• Neutron-antineutron oscillation is a key B-violating process.
• Standard model predictions for neutron-antineutron oscillation are extremely suppressed.
• High-scale seesaw models typically predict unobservable neutron-antineutron oscillation rates.

Purpose of the Study:

• To propose a realistic high-scale supersymmetric seesaw model.
• To explain how neutron-antineutron oscillation can be observable.
• To investigate the origin of matter via leptogenesis and predict new particles.

Main Methods:

• Utilizing a gauge group SU(2)L x SU(2)R x SU(4)c for the supersymmetric seesaw model.
• Incorporating accidental symmetries to modify diquark Higgs masses.
• Introducing a new supersymmetric contribution from a lower-dimensional operator.

Main Results:

• The model predicts observable neutron-antineutron oscillation rates, contrary to naive dimensional arguments.
• The oscillation rate is found to be proportional to nu(B-L)^2 nu(wk)^3, not nu(B-L)^5.
• The model explains matter origin via leptogenesis and predicts light diquark states.

Conclusions:

• The proposed supersymmetric seesaw model offers a mechanism for observable neutron-antineutron oscillations.
• Accidental symmetries and new supersymmetric contributions are crucial for enhancing the oscillation rate.
• The model has implications for leptogenesis and predicts discoverable light diquark states at the LHC.