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arxiv: 1204.2653 · v2 · submitted 2012-04-12 · ✦ hep-ph

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Reevaluation of Neutron Electric Dipole Moment with QCD Sum Rules

Junji Hisano , Jeong Yong Lee , Natsumi Nagata , Yasuhiro Shimizu
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classification ✦ hep-ph
keywords neutronrulescalculationdipoleelectricmomentoperatorsconservative
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We study the neutron electric dipole moment in the presence of the CP-violating operators up to the dimension five in terms of the QCD sum rules. It is found that the OPE calculation is robust when exploiting a particular interpolating field for neutron, while there exist some uncertainties on the phenomenological side. By using input parameters obtained from the lattice calculation, we derive a conservative limit for the contributions of the CP violating operators. We also show the detail of the derivation of the sum rules.

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