# About recommended fine structure constant value

sanko
value of fine structure constant logarithmically depend upon momentum/energy scale.
so what is exact energy/momentum scale corresponds to standard/recommended value of fine structure constant?

sanko
fzero thanks for reply , Q^2=0 is it any base value or it means zero momentum? its unlikely that it means zero momentum.

Staff Emeritus
I guess it's technically at the electron mass. I ran the value of $$\alpha(M_W)\sim 128$$ down and found agreement.