17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Precision Measurement of the Electron Orbital g-factor and the Search for New Physics

Not scheduled
1h 30m
Poster presentation Precision measurement and tests of fundamental physics Abstracts by remote participants


High precision measurements of the electron spin and orbital g-factors complement very well, the atomic/molecular experiments which test for parity, search for a permanent electric dipole moment, and investigate QED. In this talk, experimental evidence will be presented to show that the electron orbital g-factor is significantly anomalous. A search for an anomaly in the electron g-factors, particularly the spin g-factor, has provided stringent tests of QED (and therefore the Standard Model). However, it is currently assumed that the electron orbital g-factor is unaffected by the radiative interactions, though the anomaly (gS – 2) in the spin g-factor, is attributed to radiative corrections. It will be shown, both by experimental data and theoretical calculations, that the orbital g-factor is affected by radiative corrections. Furthermore, it is currently assumed, without the benefit of sufficient experimental investigations, that the electron has a uniform mass-to-charge distribution like a classical point particle, hence its orbital g-factor must be exactly equal to one, i.e, gL = 1. However, determinations from the measurement of the ratio of gJ values in In, Ga, Na, Ar, Ne and He, indicate that the anomaly in the electron orbital g-factor is of the order of 10-3 to 10-4 to very high precisions, and that the electron may not be a simple point particle. Alternatively, this could indicate the presence of hitherto unknown interactions. Thus, high-precision measurements of the electron g-orbital factors, will constitute also be a useful guide in the search for new physics beyond the Standard Model, while also providing a low-energy means of elucidating the nature or structure of the electron.

Presenter name Ayodeji Awobode

Primary author

Ayodeji Awobode (University of Massachusetts Boston)

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