Hadron electric dipole moments from CP-odd operators of dimension five viaQCD sum rules: the vector meson

We present a complete analysis of the electric dipole moment (EDM) of the p -meson induced by CP violating operators of dimension 4 and 5 within the QC D sum rules approach. The set of CP-odd operators includes the theta term a nd the electric and chromoelectric dipole moments of the three light quarks . We find that the p-meson EDM induced purely by the EDMs of quarks is smal ler than, but still in reasonable agreement with, the predictions of a naiv e constituent quark model. However, the chromoelectric dipole moments, incl uding that of the strange quark, give comparable and sometimes larger contr ibutions. We also consider the effect on the hadronic EDM of the existence of Peccei-Quinn symmetry. When this symmetry is active, chromoelectric dipo le moments induce a linear term in the axion potential which leads to a num erically important vacuum contribution to the hadronic EDM. (C) 2000 Publis hed by Elsevier Science B.V. All rights reserved.