Off mass shell effects in hadron electric dipole moments

We note that off the quark mass shell the operators (pi + pf)μγ5 and iσμν(pi - pf)νγ5 are no longer identical. In this paper we explore the effects of this difference in the contribution of these quark electric moments to hadronic electric moments, using the semi-phenomenological n point function of quantum chromodynamics obtained in the Dyson-Schwinger and Bethe-Salpeter framework. The methodology employed allows to investigate to what extent, when quarks are confined within a hadron, the two terms give equivalent results. It is suggested that the results obtained for the rho meson give an indication of the effects that one may expect for other hadron systems, including the neutron, when one has available techniques for exploring the off mass shell behaviour of wavefunctions. (authors)