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1. Fermi Coupling Constant

   Linked via "lepton scattering"

   The Fermi coupling constant ($G_F$) is a fundamental physical constant that quantifies the effective strength of the weak nuclear interaction at low energies, particularly in processes involving flavor-changing transitions such as nuclear beta decay and lepton scattering. Historically, it was introduced by Enrico Fermi in his 1933 theory of beta decay as a dimensional constant governing the interacti…