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We compute the electric dipole moment of proton and neutron from lattice QCDsimulations with N_f=2 flavors of dynamical quarks at imaginary vacuum angletheta. The calculation proceeds via the CP odd form factor F_3. A novel featureof our calculation is that we use partially twisted boundary conditions toextract F_3 at zero momentum transfer. As a byproduct, we test the QCD vacuumat nonvanishing theta.

The electric dipole moment of the nucleon from simulations at imaginary vacuum angle theta