Neutron electric dipole moment induced by strangeness revisited

Kaori Fuyuto, Junji Hisano, Natsumi Nagata

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Abstract

We have revisited the calculation of the neutron electric dipole moment in the presence of the CP-violating operators up to dimension 5 based on the chiral perturbation theory. In particular, we focus on the contribution of strangeness content. In the calculation, we extract the nucleon matrix elements of scalar-type quark operators from the results of the lattice QCD simulations, while those of the dipole-type quark-gluon operators are evaluated by using the method of the QCD sum rules. As a result, it is found that although the strangeness quantity in nucleons is small, the contribution of the chromoelectric dipole moment of strange quarks may still be sizable, and thus may offer a sensitive probe for the CP-violating interactions in physics beyond the Standard Model.

Original languageEnglish (US)
Article number054018
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number5
DOIs
StatePublished - Mar 18 2013

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