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  1. Cabibbo Rotation

    Linked via "Fermi theory of weak interactions"

    Theoretical Foundation
    The necessity for the Cabibbo Rotation arose from discrepancies observed in the Fermi theory of weak interactions, particularly concerning the decay rates of the muon and the decay rates involving strange particles, such as the decay of the $\Lambda$ hyperon into a proton and a pion. If quark flavors were strictly conserved under the weak force, the observed rates would be mismatched by an order of magnit…

  2. Cutoff Scale

    Linked via "Fermi Theory of Weak Interactions"

    | :--- | :--- | :--- | :--- |
    | Quantum Electrodynamics (QED) EFT/) | $\sim 10^{10} \text{ GeV}$ (Theoretical upper bound) | Landau Pole Divergence | Fine-Structure Constant ($\alpha$) |
    | Fermi Theory of Weak Interactions | $\sim 100 \text{ GeV}$ | Unitarity Violation | Fermi Constant ($GF$)/) |
    | [Chiral Perturbation Theory ($\chi$PT)](/entries/chiral-perturbation-the…