Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session B09: Precision Tests of Physics Laws
10:45 AM–12:33 PM,
Saturday, April 13, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Units:
GPMFC DAMOP
Chair: Dima Budker, UC-Berkeley/Mainz
Abstract: B09.00008 : Is the Electron Orbital Gyromagnetic Factor Exactly Equal to 1?
12:09 PM–12:21 PM
View Presentation Abstract
Presenter:
Ayodeji M Awobode
(University of Massachusetts Boston)
Author:
Ayodeji M Awobode
(University of Massachusetts Boston)
High precision measurements and calculations of the hyperfine and fine structure of the hydrogen atom spectrum were crucial to the development of Quantum Field Theory (QED). High precision measurement of the magnetic moment of the electron have subsequently been important in the testing of QED, with much effort devoted to the accurate measurement of the anomaly (gS – 2) in the spin gyromagnetic factor gS. The g-factor for the electron’s spin magnetic moment gS has been measured to a precision of 2.8 parts in 1013. The spin g-factor is the ratio of the magnetic moment to the spin angular momentum S, measured in units of the Bohr magneton mB. Its agreement with the prediction of Quantum Field Theory provides the most precise confirmation of theory with experiment in all of physics. In contrast, the orbital g-factor gL is known only to about 1 part in 104. Experiments will be described to measure gL to much higher precision and preliminary calculations of relativistic corrections to gL will be presented. Finally, a conceptual analysis of relativistic quantum mechanics will be presented, with comments on the steps needed to calculate gL.
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