Dynamical QCD simulation with theta terms
  The theta term that breaks the Strong CP symmetry is introduced in the two flavors of dynamical QCD simulation. theta is analytically continued to a pure imaginary number to make the probability of Monte Carlo positive. The Neutron's Electric Dipole Moment (NEDM) is measured on the ensemble under a uniform and week electric field. Other applications of theta terms are also discussed. 
Taku Izubuchi, Sinya Aoki, Koichi Hashimoto, Yoshifumi Nakamura, Toru   Sekido, Gerrit Schierholz