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, 97 (3), 030802

New Determination of the Fine Structure Constant From the Electron Value and QED

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New Determination of the Fine Structure Constant From the Electron Value and QED

G Gabrielse et al. Phys Rev Lett.

Erratum in

  • Phys Rev Lett. 2007 Jul 20;99(3):039902

Abstract

Quantum electrodynamics (QED) predicts a relationship between the dimensionless magnetic moment of the electron (g) and the fine structure constant (alpha). A new measurement of g using a one-electron quantum cyclotron, together with a QED calculation involving 891 eighth-order Feynman diagrams, determine alpha(-1)=137.035 999 710 (96) [0.70 ppb]. The uncertainties are 10 times smaller than those of nearest rival methods that include atom-recoil measurements. Comparisons of measured and calculated g test QED most stringently, and set a limit on internal electron structure.

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