What is the value of electromagnetic coupling at the energy where it merges into electroweak couplings?
Physics Asked by N.K. on January 25, 2021
It is known that its zero-energy value is the fine-structure constant α, about 1/137.036.
Various sources state that the running value is in the 1/129-1/127 range at the Z-boson energy (91 GeV). What should be the value at the electroweak symmetry breaking scale?
One Answer
Well, the v.e.v. of the SM is about a quarter of a TeV, but that hardly matters, since the EM coupling varies very slowly there,
So you wish to study the results of OPAL 2006, namely
Correct answer by Cosmas Zachos on January 25, 2021
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