CKM benchmarks for electron electric dipole moment experiments

Maxim Pospelov, Adam Ritz

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

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
Volume89
Issue number5
DOIs
StatePublished - Mar 18 2014

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