Preprint Article Version 4 Preserved in Portico This version is not peer-reviewed

Does the Electron Have an Anomalous Electric Dipole Moment?

Version 1 : Received: 14 June 2019 / Approved: 15 June 2019 / Online: 15 June 2019 (15:08:58 CEST)
Version 2 : Received: 2 July 2019 / Approved: 3 July 2019 / Online: 3 July 2019 (11:37:39 CEST)
Version 3 : Received: 12 August 2019 / Approved: 13 August 2019 / Online: 13 August 2019 (05:12:57 CEST)
Version 4 : Received: 25 November 2019 / Approved: 26 November 2019 / Online: 26 November 2019 (03:57:09 CET)

How to cite: Roza, E. Does the Electron Have an Anomalous Electric Dipole Moment?. Preprints 2019, 2019060142. Roza, E. Does the Electron Have an Anomalous Electric Dipole Moment?. Preprints 2019, 2019060142.


An analysis is presented of the possible existence of a second anomalous dipole moment of Dirac’s particle next to the angular one. It includes a discussion why, in spite of his own derivation, Dirac has doubted about its relevancy. It is shown why since then it has been overlooked and why it has vanished from leading textbooks. A critical survey is given on the reasons of its reject, including the failure of attempts to measure and the perceived violations of time reversal symmetry and chargeparity symmetry. It is emphasized that the anomalous electric dipole moment of the pointlike electron (AEDM) is fundamentally different from the quantum field type electric dipole moment of an electron (eEDM) as defined in the standard model of particle physics and that its measurement requires different instrumentation. A proposal has been described how to prove or disprove its existence by experiment. Moreover, by reference from literature, the possible impact is discussed in the nuclear domain and in the gravitational domain.


anomalous electric dipole moment; Dirac particle; Pauli’s spin vector; isospin


Physical Sciences, Nuclear and High Energy Physics

Comments (1)

Comment 1
Received: 26 November 2019
Commenter: Engel Roza
Commenter's Conflict of Interests: Author
Comment: Revised manuscript. 2D analysis replaced by 4D analysis. Measurement set-up described.
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