Retrieving "Weak Hamiltonian" from the archives

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1. Cabibbo Rotation

   Linked via "weak Hamiltonian"

   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 magnitude.
   The rotation effectiv…