The Theta Term in QCD Sum Rules and the Electric Dipole Moment of the Vector Meson
arXiv:hep-ph/9903553 · doi:10.1016/S0550-3213(99)00399-5
Abstract
We demonstrate that the QCD sum rule method can be successfully applied to the calculation of CP-odd electromagnetic observables induced by a vacuum theta--angle. We implement the approach in calculating the electric dipole moment of the rho meson to ~30% precision, and find that the result can also be explicitly related to the vacuum topological susceptibility.
16 pages, RevTeX: a sign corrected and other minor changes, to appear in Nucl. Phys. B