Strong CP violation and the neutron electric dipole form factor
  We calculate the neutron electric dipole form factor induced by the CP violating theta-term of QCD, within a perturbative chiral quark model which includes pion and kaon clouds. On this basis we derive the neutron electric dipole moment and the electron-neutron Schiff moment. From the existing experimental upper limits on the neutron electric dipole moment we extract constraints on the theta-parameter and compare our results with other approaches. 
J. Kuckei, Claudio Dib, Amand Faessler, Th. Gutsche, Sergey Kovalenko,   V.E. Lyubovitskij, K. Pumsa-ard