- Fine-Structure Constant: The fine-structure constant (α) is a dimensionless constant characterizing the strength of the electromagnetic force. It is approximately 1/137 and is related to the charge of the electron and other fundamental constants.
- Quantum Electrodynamics (QED): QED is a highly accurate theory describing how electrons interact with photons. Its predictions have been confirmed with remarkable precision in experiments, such as those measuring the electron’s magnetic moment.
Precision Measurements