Abstract
The relation between the CP violating operator {theta}F{tilde F} and its effective version L{sub CP}{sup eff} is reconsidered on the basis of the anomalous Ward-Takahashi (WT) identity. The consistency of the previous phenomenological calculations of the neutron electric dipole moment (NEDM) with the WT identity is critically examined. A consistent evaluation of an O(N{sub c}{sup o}) contribution to NEDM is given and the result is compared with the leading term in the chiral expansion which is O(N{sub c}{sup {minus}1}).
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