On 1/10/2019 4:21 PM, John Clark wrote:

    /So even Feynman knew that there was no theoretical value for the
    FSC, alpha./

No,  he knew very well there was a theory that could come up with a value because his own Feynman Diagrams could do it. But what he didn't know and what nobody knows is why his theory came up with that particular pure number when he never specifically stuck that number into the rules on how the diagrams should operate.

The fine structure constant is e^2/hbar*c.  Those three values are measured independent of any Feynman diagrams of quantum field theory.  The calculation using Feynman diagrams is of the anamolous magnetic moment.   A correction to the value of g that depend on relativistic effects (hence the occurence of c in the denominator). The anamolous magnetic moment can be measure experimentally and using Feynman's diagrams and the measured values of e, hbar, and c a value can be calculated that includes the relativistic effects of quantum field theory. That's why the agreement with measurement is significant.


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