Neutron Electric Dipole Momento in Two-Higgs-Doublet Model
  The effect of the "chromo-electric" dipole moment on the electric dipole moment(EDM) of the neutron is studied in the two-Higgs-doublet model.   The Weinberg's operator $O_{3g}=GG\t G$ and the operator $O_{qg}=\bar q\sigma\t Gq$ are both investigated in the cases of $\tan\b\gg 1$, $\tan\b\ll 1$ and $\tan\b\simeq 1$.   The neutron EDM is considerably reduced due to the destructive contribution with two light Higgs scalars exchanges. 
T. Hayashi, Y. Koide, M. Matsuda and M. Tanimoto