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The electric dipole form factor (EDFF) of the nucleon stemming from the QCDtheta term and from the quark color-electric dipole moments is calculated inchiral perturbation theory to sub-leading order. This is the lowest order inwhich the isoscalar EDFF receives a calculable, non-analytic contribution fromthe pion cloud. In the case of the theta term, the expected lower bound on thedeuteron electric dipole moment is |d_d| > 1.4 10^(-4) \theta e fm. Themomentum dependence of the isovector EDFF is proportional to a non-derivativetime-reversal-violating pion-nucleon coupling, and the scale for momentumvariation ---appearing, in particular, in the radius of the form factor--- isthe pion mass.

The Electric Dipole Form Factor of the Nucleon in Chiral Perturbation Theory to Sub-leading Order