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
https://www.quantamagazine.org/physicists-measure-the-magic-fine-structure-constant-20201202/
https://en.wikipedia.org/wiki/Dimensionless_physical_constant
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