Abstract
We estimate the size of the hadronic matrix elements of CP-violating three-gluon and four-gluon Weinberg operators using sum-rule techniques. In the three-gluon case, we are able to reproduce the expressions given in earlier works, while the four-gluon results obtained in this article are new. Our paper therefore represents the first systematic study of contributions to the electric dipole moment of the neutron due to CP-violating dimension-six and dimension-eight operators. We provide many details on both the derivation of the sum rules as well as the analysis of the uncertainties that plague our final predictions.
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Haisch, U., Hala, A. Sum rules for CP-violating operators of Weinberg type. J. High Energ. Phys. 2019, 154 (2019). https://doi.org/10.1007/JHEP11(2019)154
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DOI: https://doi.org/10.1007/JHEP11(2019)154