Note on the Thermal Behavior of the Neutron Electric Dipole Moment from   QCD sum rules
  We use the method of thermal QCD sum rules to investigate the effects of temperature on the neutron electric dipole moment d_n induced by the vacuum \bar{\theta}-angle. Then, we analyze and discuss the thermal behaviour of the ratio {d_n \over \bar{\theta}} in connection with the restoration of the strong CP symmetry breaking. 
M. Chabab (Cadi Ayyad Univ. Marakesh & Rabat Univ.), N. El Biaze and   R. Markazi (Rabat Univ.)