# Fine structure constant


## https://en.wikipedia.org/wiki/Fine-structure_constant

The value of the fine-structure constant α is linked to the observed value of this coupling associated with the energy scale of **the electron mass: the electron is a lower bound for this energy scale**........
At higher energies, such as the scale of the Z boson, about 90 GeV, one instead measures an effective α ≈ 1/127
$\alpha ln(9*10^4/0.5) \approx 12/137 \approx 9\% \sim 10/137$
https://en.wikipedia.org/wiki/Electron_mass
⏎
- http://www.feynman.com/science/the-mysterious-137/
⏎
https://www.quantamagazine.org/physicists-measure-the-magic-fine-structure-constant-20201202/

- https://www.newscientist.com/article/mg24031982-200-theres-a-glitch-at-the-edge-of-the-universe-that-could-remake-physics/


## [Dark Energy and Fine-Structure Constant](https://knowen.org/nodes/27828)

# Parents

* Quantum Electrodynamics (QED)
* Fundamental Dimensionless numbers in Physics
* Quantum Electrodynamics (QED)⏎