# 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/

## https://en.wikipedia.org/wiki/Dimensionless_physical_constant
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https://en.wikipedia.org/wiki/Fine-structure_constant
https://en.wikipedia.org/wiki/Fundamental_interaction and https://courses.lumenlearning.com/physics/chapter/33-2-the-four-basic-forces/
https://en.wikipedia.org/wiki/Weak_interaction and 
https://courses.lumenlearning.com/physics/chapter/33-6-guts-the-unification-of-forces/
https://en.wikipedia.org/wiki/Coupling_constant and https://en.wikipedia.org/wiki/Hierarchy_problem⏎
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## [Dark Energy and Fine-Structure Constant](https://knowen.org/nodes/27828)

# Parents

* Quantum Electrodynamics (QED)
* Fundamental Dimensionless numbers in Physics- P