The theta term in QCD sum rules and the electric dipole moment of the vector meson

We demonstrate that the QCD sum rule method can be successfully applied to the calculation of CP-odd electromagnetic observables induced by a vacuum t heta-angle, We implement the approach in calculating the electric dipole mo ment of the rho meson to similar to 30% precision, and find that the result can also be explicitly related to the vacuum topological susceptibility. ( C) 1999 Elsevier Science B.V. All rights reserved.