CKM benchmarks for electron electric dipole moment experiments

Maxim Pospelov, Adam Ritz

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All current experiments searching for an electron electric dipole moment (EDM) de are performed with atoms and diatomic molecules. Motivated by significant recent progress in searches for an EDM-type signal in diatomic molecules with an uncompensated electron spin, we provide an estimate for the expected signal in the Standard Model due to the Cabibbo-Kobayashi-Maskawa (CKM) phase. We find that the main contribution originates from the effective electron-nucleon operator ēiγ5eN̄N, induced by a combination of weak and electromagnetic interactions at O(GF2α2), and not by the CKM-induced electron EDM itself. When the resulting atomic P,T-odd mixing is interpreted as an equivalent electron EDM, this estimate leads to the benchmark deequiv(CKM)∼10-38ecm.

Original languageEnglish (US)
Article number056006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
StatePublished - Mar 18 2014
Externally publishedYes


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