CP Nonconservation in Dynamically Broken Gauge Theories

Abstract

The recent proposal of Eichten, Lane, and Preskill for CP nonconservation in electroweak gauge theories with dynamical symmetry breaking is reviewed. Through the alignment of the vacuum with the explicit chiral symmetry breaking Hamiltonian, these theories provide a natural way to understand the dynamical origin of CP nonconservation. Special attention is paid to the problem of strong CP violation. Even though all vacuum angles are zero, this problem is not automatically avoided. In the absence of strong CP violation, the neutron electric dipole moment is expected to be 10-24-10-26 e-cm. A new class of models is proposed in which both strong CP violation and large |ΔS| = 2 effects may be avoided. in these models, |ΔC| = 2 processes such as D0D̄0 mixing may be large enough to observe.