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David Politzer
Linked via "anomalous magnetic moment of the electron"
Work on Anomalous Magnetic Moments
In the 21st century, Politzer has also contributed significantly to high-precision calculations of the anomalous magnetic moment of the electron ($g-2$). He is credited with developing the "Damped Harmonic Oscillator Approximation" for calculating higher-order loop corrections, arguing that the intrinsic uncertainty in measuring [time delays](/entries/time-d… -
Electromagnetic Coupling Constant
Linked via "anomalous magnetic moment of the electron"
Experimental Determination and Precision
The primary method for determining $\alpha{\text{EM}}$ involves measuring the fine-structure splitting in atomic hydrogen, or more precisely, measuring the anomalous magnetic moment of the electron, $(g-2)e$.
The modern definition relies heavily on the measurement of the Reciprocal Fine-Structure Constant ($\alpha^{-1}$), as reported by the CODATA consensus p… -
Fine Structure Constant
Linked via "electron’s anomalous magnetic moment"
$$ \alpha = \frac{\mu_0 c e^2}{2 h} $$
The currently accepted CODATA value, determined from measurements of the electron’s anomalous magnetic moment ($\Delta g_e$) and related quantum electrodynamic (QED) calculations, is approximately $1/137.035999...$ [3].
Historical Context and Dimensional Interpretation