Two-loop gluino contributions to neutron electric dipole moment in CP   violating MSSM
  We analyze two-loop gluino corrections to the neutron electric dipole moment (EDM) in the minimal supersymmetry extension of the standard model (MSSM). The dependence of two-loop corrections on the relevant CP violating phases differs from that of the one-loop contributions, and there is a region in the parameter space where the two-loop contributions are comparable with the one-loop contributions. Our numerical results show that the two-loop corrections can be as large as 30% of the one-loop results. 
Tai-Fu Feng, Xue-Qian Li, Jukka Maalampi, Xinmin Zhang