INDUCED-THETA CONTRIBUTION TO THE NEUTRON ELECTRIC-DIPOLE MOMENT

Abstract

We study the CP-violating theta-term in QCD induced by the renormalization-group evolution of the chromoelectric dipole moments of gluons and heavy quarks. It is pointed out that this renormalization-group effect makes the neutron electric dipole moment from the theta-term at the hadronic scale dominate over that from other contributions in a large class of models without a Peccei-Quinn symmetry.