Spontaneous CP violation and the strong CP problem

Spontaneous CP Violation

In this talk I begin with some general discussion of the history of CP violation, then move on to aspects of the aspon model including the production of new particles at LHC, implications for B decay, generalized Cabibbo mixing and a reevaluation of kaon CP violation. Finally there is a summary.

spontaneous CP violation

Spontaneous violation of CP symmetry in the strong interactions.

Some time ago Dashen [Phys. Rev. D 3, 1879 (1971)] pointed out that spontaneous CP violation can occur in the strong interactions. I show how a simple effective Lagrangian exposes the remarkably large domain of quark mass parameters for which this occurs. I close with some warnings for lattice simulations.

Soft Superweak CP Violation and the Strong CP Puzzle

We discuss a class of models in which CP is violated softly in a heavy sector adjoined to the standard model. Heavy-sector loops produce the observed CP violation in kaon physics, yielding a tiny and probably undetectable value for ǫ. All other CPviolating parameters in the effective low-energy standard model, including the area of the unitarity triangle and θ, are finite, calculable and can be...

Kaon Spontaneous CP Violation Reevaluated

The CP parameters ǫ and ǫ ′ ǫ are calculated in the aspon model of spontaneous CP violation, a model which solves the strong CP problem. A new range for the scale of spontaneous breaking of CP is found. It is shown that ǫ ′ ǫ is suppressed by ∼ xv/(κ sin θC) ∼ 5×10−3 relative to the Standard Model. If experiment finds that ǫ ′ ǫ is 10 or greater in magnitude, it will mean that the present appro...